BasicChristian. So it does appear when the vehicle is not moving and the RPM's are revving. there is a hissing sound. The first thing it could be is that the switch in the back of your motor has gone bad or is not in the correct position. Re: Loud hissing noise from air conditioning ? Don't worry bout it, all navs seem to do it for some reason, what it does is normally a sign of the system being sort of refrigerant, but it stops a few seconds after start up, if it was short of refrigerant then it would constantly do it until the compressor cuts out on low pressure. do you know what this is as im worried when i have to take my 2 kids school in it. He did say it sounded like it was coming from near the DVs, which are on the other side of the engine bay. this morning as i was turning into a parking spot with the radio off i notice their is a hissing sound evertime i turn the wheel? seems like its comin Engine hissing/sizzling sound when turning steering wheel?. the next day is when i also started to notice a hissing sound coming from the engine bay and when i shut the engine off it hisses slowly and sounds like it's winding down almost sounds like the turbo is spooling i've put my ear all around to try and pin point the sound and it seems to be coming from the middle of the valve cover. The noise sounds likes it is coming from the area in between the radiator and the front of the engine. I searched "hissing" but got nothing helpful. I dont know if this has been happening always but I have just noticed it now. 2004 - 2008 Ford F150 - Rough Idle/Misfiring - HELP! (2006 F150 5. A plastic vacuum. These pictures cannot do justice to this magnificent and long gone age. Loud hissing sound like deflating a tire---- On our way home from a "learning the new motorhome camping trip" I heard a very loud hissing sound from the right front. The booster uses a rubber diaphragm and a push rod. The controls operate by a Vacuum connected to the inlet manifold or in your case the injection manifold. A leaky exhaust valve can be due to carbon buildup, a worn valve guide or a valve that's seating poorly and letting hot exhaust gases past a point where the valve "burns" and erodes at its edge. Hi Xyloft, My baby is an I4. I hear it during idle or when the car stops. The car did not always make the noise. Today I was in my 2002 Nissan Sentra SE-R and I heard a hissing noise come from one of the speakers. i keep hearing this strange hissing sound coming from around the intake manifold of my 528e never really noticed it before today. If when you turn off the jeep and you hear a hissing sound after for a second you have a vacuum leak. You can hear the leak when you pop the bonnet with the engine running, and it is obvious when you feel near the pipe for a leak. it is a constant whine that sounds like a bearing and does not change pitch or speed up or slow down until you turn the engine off and at that exact point it sounds like it is releasing pressure from the side of the engine. I just drained Air and Oil Separator 2 hours ago and I just got Air Cup Coilovers 2-3 days ago. Discontinue charging immediately if the battery is hot to the touch. it does help to lower intake temps. On that note, if you or a mod wants to change the title to 'exhaust fumes in cab' or something more suitable for the search box. While there are things in the engine bay of your F-150 that could fail and cause a hissing noise, if your truck is running correctly when you hear this hissing noise on shutdown, the odds are good that it is just the air conditioning system depressurizing. Engine bay hiss Discussion in 'Mechanical When the car is running or just after it's been turned off there is a hissing/air leak noise under the bonnet. Couldn't find anything out of the ordinary. The 4Runner had been sitting in airport long-term parking for 5-days. The engine may run well at higher RPMs, but surges, runs rough and struggles to maintain stable RPMs at idle. Like the title sais. I'd say that at those revs it would be a turbo hose I've had it a few times in various work vans in recent years, if its a split it can be dificult to find on the motor as the hole will ony open up under preasure thats why it only does it at 2500rpm and the vans being driven. The 2' piece of hose will act like a stethoscope and amplify the hissing sound when you get close to it. When there's white smoke, check first for coolant leak. Overly Noisy Engine. Sure smelled bad in the engine bay. It is a noise coming from somewhere under the glove box area. Although scientists are still not completely sure why we have earwax, it does trap dust and other small particles and prevent them from reaching, and. Listen closely to your Mercedes Benz E320’s front as well as rear wheels. com Symptoms of engine vacuum leak: The problems that arise from an engine vacuum leak can be more than annoying. CAI (cold air intake) A modified replacement intake system, often bypassing the stock airbox, meant to supply the engine with cold air from outside of the car (as opposed to hot air from under the bonnet). I found the filter was very loose and oil was leaking from the filter seal. The mechanic couldn't find a code for the light and couldn't find anything wrong. After sound proofing the car, and installing an effective muffler, new noises become apparent. Please help me someone!!. just recently i have noticed a loud hissing sound comming from the engine area. The noise sounds likes it is coming from the area in between the radi. The softest sound humans can hear, at the very threshold of hearing, has a loudness of 0 decibels. I get a deeper growl of air rushing into the intake on heavier acceleration. When i give it more gas, it stops thoughim curious as to what this isi cant tell 100% where its coming from, but it sounds like either the engine bay or underneath the car somewherei know its vague, but if anyone can offer me some suggestions, i would. I can fill the filed off part of the dipstick no problem. Engine bay hiss Discussion in 'Mechanical When the car is running or just after it's been turned off there is a hissing/air leak noise under the bonnet. A lot can be learned by listening to your engine, so if your car starts to change its tune, you should take heed. Are you sure its not the. Another sound that came from combining many other sounds was when the Falcon fails to jump into hyperspace in The Empire Strikes Back. He popped the hood, and found his cat on top of the air cleaner cover, completely unhurt but understandably freaked out. I recently had new fan belts installed after hearing a high-pitched, whining noise, but that didn't solve the problem. No hissing that I could hear of, just the whistle as the revs rise and fall with the AC on only. As the lone survivor of a passenger jet crash, you find yourself in a mysterious forest battling to stay alive against a society of cannibalistic mutants. It only happens when I have the AC on, and it's pretty audible from the driver's seat. When my A/C is running it is making a hissing noise from interior vents and driver side is not cooling as much as passengers side. The main symptom of EHS is hearing or feeling a loud and sudden sound. A buddy of mine drove his truck to a ski area and heard a strange sound from the engine bay after he turned the motor off. The clutch is then released and the RPMs pick up again. i keep hearing this strange hissing sound coming from around the intake manifold of my 528e never really noticed it before today. From what I can tell its either a hole in the flex pipe or "There's a lip on the inside that catches the air and makes the wissling/hissing sound. Garage told me its a very common problem and has had many bmw's with cracked manifolds. Sounds more like a small fan or pump rather than leaking air. The sound is especially loud during a cold start or when you accelerate the. I took mine to a local mechanic to hook the computer up to my pilot and found out the my trans was bad. My first impression would be that a large vacuum leak has developed. module is the two lines comin out the firewall from inside, the one that turns and goes. The loudness, or intensity, of sound is measured in decibels. Not constantmaybe every 20+ seconds or so. Author's Note: Top 5 Signs of Engine Trouble. The sound is definitely coming from the engine bay. No more washing with hot engine. There are different levels of hissing, as we’ll explain here, but the bottom line is that hissing isn’t a sound you want to ignore, especially with summer just around the corner. While there had been previous attempts before, Benz's creation with an internal engine is what set his invention apart from the rest. Procarmechanics. It only happens when I have the AC on, and it's pretty audible from the driver's seat. When the engine speed (not car speed) reached a certain RPM, the Hissing kicks in, constant frequency hiss. i have an mk6 with DSG. After a quick visit from my sister, Arden in Juno Beach, Lynn and I headed north for Jax Beach. Exploding head syndrome symptoms. It continued after turning the ignition off as well. Loosened and tightened manifold boots, no difference. It is almost like a white noise sound. Likewise, noise is excellent at supressing muffled sounds that come through thinly walled rooms like those in university accommodation or office space. Normally the intake tract is pressurized within a few seconds and the sound of the air changes. I tried looking for it today but the hissing was. there is a hissing sound. You had to smell the sulphurous oil and the hissing of the beast to really appreciate it. 8L petrol Insignia it has been known you may hear a rattling sound coming. Has any one of you had or have the same problem. 0TDI + slight smell of fumes in the cabin at points, I decided to remove the injector seals today. Hello All, My girl has a 2014 Jetta automatic. Listen for any hissing noise - this will indicate a boost leak. Easy step by step guide on how to fix an automotive engine whistle, this information is displayed in order of probability and pertains to most vehicles. A small backfire makes a pop. 9L Cummins Diesel. That’s more video time than all seasons of Sons of Anarchy. Stopped working again last week. Our '02 EB with dual auto temp control has a vacuum hiss sound at part throttle when it's below freezing in the winter. Cause: If a faucet is leaking enough, it can sound like it's running. The only thing I had trouble with is the kit should come with 1 more chrome hose. If it moves freely, turn the steering wheel and see if it is still hard to turn while the cylinder is still disconnected. It goes away. When poking my head around the engine bay recently while the block heater was plugged in, I noticed a fairly loud steam hissing sound. either way you need a new brake booster. My guess it was a little drip of water on hot manifold or something? Otherwise, is there a sensor when engine gets wet? Kind of freaked me out. When i give it more gas, it stops thoughim curious as to what this isi cant tell 100% where its coming from, but it sounds like either the engine bay or underneath the car somewherei know its vague, but if anyone can offer me some suggestions, i would. When does it make the noise? Nine times out of ten the noise will come from a moving part and can be pinpointed to when that system is functioning. Could someone please tell me what that is?. It sorta sounds like air being released from a tire. but i noticed there was a small hissing sound inside the car now. Hi, I have all mods in my sig and have about 25k on her. 4) Compressor sound. The weight of passengers, cargo and options or accessories may reduce the amount you can tow. Hissing Sound. Engine Noise Problems of Chevrolet Sonic. Engineering Explained: Cold Air Intakes Vs Short Ram Intakes. As the lone survivor of a passenger jet crash, you find yourself in a mysterious forest battling to stay alive against a society of cannibalistic mutants. So now, you can test if your boost hose is properly fitted. Don’t ignore engine sounds–it can lead to serious trouble. Ok starting off I had a ticking sound when the engine first started that would. It really sounds like air, but I can't feel anything poking my hand around the area. Indeed, any hissing sounds near or in the air box with engine running indicates a leak. some people said it Could be a result of air condition equilising pressure. I noticed audible hissing/leaking noise coming from the engine bay (but not too loud) whenever I press on the gas pedal and accelerates. It's difficult to hear but between 1500-2500rpm you can hear as the turbo boost rises and falls. Usually within a few minutes. It is not a whistle and seems much too high frequency to be described as ticking. Whenever you hear buzzing from an electrical fixture, such as a wall outlet, you're hearing this current. I just recently replaced Circ pump because it was starting to fail and belts were slinging water getting everything wet. Like you, I thought it was a car in front of me, but quickly realised it was coming from my engine bay. Anchor Bay Entertainment To achieve the ticking and hissing sound that's heard every time the box is opened we used the sound of an airplane exhaust overdubbed with the sound made by human. You had to smell the sulphurous oil and the hissing of the beast to really appreciate it. I got in my TRDP after lunch, and there was this hissing sound. I got my oil changed at the dealership a while back and when I got back in my car is when I noticed it. com has been a trusted online store for DJs, Producers, & Designers. It is gone if I let my foot off the gas pedal. The garage person told me that its the condensor bearings making the noise and that he will refill the gas if its a leak problem. Hissing sound during acceleration - dealer tech unhelpful If this is your first visit, be sure to check out the FAQ by clicking the link above. Anyone have ideas/heard this before??. After you find the source of the leak, the following information will help you decide whether you can handle it yourself or you need professional help. The first I believe is a fuel pump that continues to make the priming noise rather than just briefly. My flex has been misfiring all the time ever seines the dealership did a timing chain and water pump. It sounds like a hydraulic "psssst" and is more audible with the windows open. Cat purring sounds like a little engine! Unhappy cats might yowl, or cry out loudly. It's still unclear what exactly causes it, but the speculations have been narrowed down to coil noise or coil. The car makes an intermittent hissing or pfffttt. The pedal will then go down a bit as the vacuum builds up again. Just returned from my holiday abroad where my very well maintained 2002 Peugeot Boxer developed a strange sound from the engine with a slight loss of power. check your vacuum lines, turn engine on in a relatively quite area, open hood, listen for any strange air sound (hissing sound) coming from the engine bay, and locate the sound if it exists, most of the time it would be coming from the small black hoses running on either side of the engine (vacuum lines). Don't be afraid to turn up the sound (it's not a trick, I promise. 4 exhaust manifold - I have a 2010 F-150 with 115k miles. These sound vibrations eventually reach your. Remember that the fan belt is needed to operate not only these critical components but the engine as well. I'm going to take it into the dealership to have them look at it. I set the car down and drove around the street. With the engine off, inspect the drive belts for tension, wear, and cracks. When I open the hood, I definitely hear the accessory belt rattling. during low speed acceleration in 1st and 2nd gear, i can hear a hissing/scratching sound. When I push the brake pedal, I get a hissing noise from the passenger footwell. I'll be driving along normally, not pushing the car hard with the A/C on, and it will spew white smoke from the vens for about 15 seconds. This is a new one for me. Intermittant LOUD hissing noise, lasts a few. Lo and behold, I can hear a hissing sound in that area, specifically if I point my ear at the alternator. When I released the brake pedal, the sound again came. A whining or buzzing type noise may develop from the timing chain area caused by excess slack in the secondary timing chains. Could this be an air leak? Ive attached a picture of a hose that goes to the carb from something behind the engine (forgive my lack of technical terms). It comes from the engine compartment, passanger side, in front of the firewall from a part covered in a large black plastic cap. How to Fix Engine Noises Abnormal engine noises are trying to tell you there is a problem Today's car engines are designed with more complexity and moving parts than ever before. Took it to an exhaust specialist who welded it back on in place for $30. Sure enough, the hiss is there. For safety's sake the system must operate for at least one or two brake applications even if the engine stops, and a small check valve is therefore incorporated to maintain the booster vacuum under these conditions. Only one diesel engine - a 1. The motorcycle repair manuals also contain a troubleshooting section which will help you diagnose the problems you are having. From reading other threads some have this problem, some don't. I've included a still photo of the engine bay, and would love your help locating the possible culprit hoses. They say its NORMAL. Another sign and symptom is a rough idle. When the engine speed drops to a certain RPM -- such as shifting to the next higher gear, the hissing stops. I immediately drove back home. The 4Runner had been sitting in airport long-term parking for 5-days. sounds like rushing air like punctured tire. When the engine speed (not car speed) reached a certain RPM, the Hissing kicks in, constant frequency hiss. Aside from the fact that the noise is high in pitch, I can say that when I turn off the engine, it goes away as the engine winds down (as opposed to stopping immediately). Loud sucking/ hissing noise coming from engine bay? 3 Answers. Hey guys, I'm a recent new owner of 2017 Mazda3 Touring 2. I started the car, everything is ok. I think I've seen comments on this elsewhere with other engines, maybe only with autos. Excessively noisy engine. If your engine belts squeak only when damp, you probably only need to have the belts adjusted. How much does Noise from engine or exhaust Inspection cost? Get an estimate instantly. How to give a Cummins 5. there is a hissing sound. This is the story of my trip there quite a few years ago when I lived in FL. NEW Tacoma, 6 cyl, tow package. 4L DESCRIPTION The 2. It's really not that loud, and like I said just by the sound of it it has to be something small. After sound proofing the car, and installing an effective muffler, new noises become apparent. -----If not for the sound instinct of a follow-up EPS officer one week later who did an impromptu search of the grounds her body would quite likely have remained unfound until it began to smell in the spring. A whining or buzzing type noise may develop from the timing chain area caused by excess slack in the secondary timing chains. Smarter design for higher performance and fewer clogs Smarter design for higher performance and fewer clogs all at a great price. The ZF and GM5 automatic gearboxes used in the Range Rover ® L322 are prone to failure. We took a bungee and hooked one end to the solenoid linkage, ran it down under the frame and hooked the other end to another point to hold the solenoid closed. BMW of Honolulu is no help at all. Most of the time I do sit in such a calm and defended library that I have deliberately constructed inside my head and inside my writing room (my bedroom). Cold-start engine clicking is a nuisance, not a disaster. if on when the engine is not on then its not there either. In the middle of Bay Lake, deep within the heart of the Walt Disney World property, lies Discovery Island. I set the car down and drove around the street. When I switch on AC now, there is a gurgling/hissing sound. Notice if the sound changes with engine speed or vehicle speed. There are no fluid leaks under the vehicle or anywhere that I could find. I got in my TRDP after lunch, and there was this hissing sound. Discover how to diagnose engine noise. It's gotten progressively worse over the past few weeks. No change in frequency with accels. At this point I'm open to guesses. 4 exhaust manifold - I have a 2010 F-150 with 115k miles. Here’s a video on Member Log In Procedure so you can unlock all the Premium videos on Fix My Hog and find what you need. You can hear the leak when you pop the bonnet with the engine running, and it is obvious when you feel near the pipe for a leak. Right! NOW! When I turn the AC on, I hear this same hissing sound cutting in and out every 10 seconds. This is a new one for me. I know certain vacuum hoses affect certain other things, like the 99-04 WJ has a vacuum hose in the engine bay that plugs into the firewall and when disconnected, the air only blows out of the windshield vent, and the cruise control stops working. At first I thought it was a tire leaking air. Other BOVs vent to the atmosphere, resulting in an easily identifiable hissing sound upon release of the throttle. This Alpine Power Pack has not disappointed and the sound is fantastic in my Runner. Have issues from engine bay every time engine is off just recently. I checked that everything is tight in the engine bay. The sound is especially loud during a cold start or when you accelerate the. I could hear this noise on my 09 but only after installing an aftermarket cold air intake. A common joke about the solution to resolving a weird noise coming from your car is to turn up the radio. Genie began building compressed air powered boom lifts in 1966. It's accessible from the engine bay, but it takes a bit of getting to from my research. I listened to the engine bay and the hissing was still there albeit MUCH less pronounced. Here’s a video on Member Log In Procedure so you can unlock all the Premium videos on Fix My Hog and find what you need. Very time-consuming, each sleeper bay is painted with PVA and the ballast mix (or in some parts of the layout, ash) is sprinkled on and the residue removed once the glue has dried. You can hear the leak when you pop the bonnet with the engine running, and it is obvious when you feel near the pipe for a leak. Difficulty Level - 3. Sometimes when i give my car light throttle i hear this spinning metal sound, kinda like a whirring noise, its hard to describe. The first I believe is a fuel pump that continues to make the priming noise rather than just briefly. The hissing sound is caused by equalizing pressure. On a stock truck with a vvt turbo it will sound like that (or a hair dryer) at idle. I just drained Air and Oil Separator 2 hours ago and I just got Air Cup Coilovers 2-3 days ago. Maybe you'll get lucky and find the loose joint inside the engine bay. Polar blast: Wind gusts and cold temperatures expected. Management light started flashing; there was a buzzing from under driver's side dash and in the glovebox area, a noise in sync with management light from under rear of car and a clicking from engine compartment (does not sound like accumulator). this is my first car with turbo so i don't know if it's a normal sound. Came home and inspected the underside of the car, and the engine bay above. BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical / Specific Topics > 135i Turbo Engine (N54 / N55), Exhaust and Drivetrain Modifications: Rough, Surging Idle and Loud Whistling Sound from Car. 5 year old Optima Red Top (34R) in my 4Runner and noticed a hissing sound coming from it after driving it yesterday. Is this normal?. I had to drive through a puddle that was 1. A sound like this can suggest there is an issue with the braking system, especially if the sound happens whenever you apply pressure to the brakes. Re: Loud hissing sound from bottom of the engine the fan is switched by a switch inside the rad, if you turn the engine off with the fan spinning then the fan will continue to spin until it cools the water in the rad down to below when the switch switches. Ford Transit Common Problems Solutions Hints and Tips. I have a Seat Ibiza 1. The hissing would be caused by cold water contacting hot engine parts. Common problems and solutions for Ford Explorer. Hissing/gurgling from engine bay after shut off. BasicChristian. Problem: The blower motor does not function on fan settings 1 or 2. 9L 12 valve a second life Dunks Performance’s Thorough Rebuild Improves the Power, Longevity, and Fuel Economy of a 12-Valve 5. Only problem is i have a sever hissing sound coming out of my column shifter. I took it to a local shop that wasn't a Nissan dealer and they didn't have a clue. When I switch on AC now, there is a gurgling/hissing sound. Hello All, My girl has a 2014 Jetta automatic. Hello All! I drive a 2000 Ford Taurus. I use to change all my own oil but gotten lazy and started taking it in for oil changes. In this guide we tell you what to look out for. Any suggestions on where to start looking before I take it to a mechanic?. Common problems and solutions for Ford Explorer. Many times a friend or customer will ask me to come listen to a strange hissing sound when the automobile is turned off. Its purpose is to prevent compressor surge / stalling and reduce wear on the turbocharger. The engine is called the Volvo B8444S. So, when I came home today and parked inside my garage, I turned off the car and before I went inside I noticed a strange hissing sound. if the hissing sound is coming from the inside then the diaphragm has a hole in it, but if its coming from the engine compartment then it is the vacuum hose connection. A lot can be learned by listening to your engine, so if your car starts to change its tune, you should take heed. The pedal will then go down a bit as the vacuum builds up again. There are a number of third-generation models on the used car market. In drive, idling at a stop approx 550 RPMS. It sounds like pressure building and hissing out at a constant pressure under the box of the truck. Don't be afraid to turn up the sound (it's not a trick, I promise. No more washing with hot engine. If your spa's Filter is in a sealed Filter Housing, there should be a small black pressure release valve directly on top of the housing. The late 1800s brought the invention of cars by German Karl Benz. Like you, I thought it was a car in front of me, but quickly realised it was coming from my engine bay. It's like the noise of gas being released from a pressurized canister. It continued after turning the ignition off as well. "Escaping air" sound from engine while turning off turning of my car's engine, there is a short "pffft" or hissing sound as the engine shuts down. I'm going to take it into the dealership to have them look at it. Engines that have turbo are more prone to a boost/intake leak as compared to non-turbo engines, because of the added numbers of pipes and hoses joining the turbo with the engine equipment and the pressure that a turbo gives. If the problem is not attended to the next symptom would normally be a chattering noise under drive. Historical Hawaiian natives and their culture in the ninteenth century as viewed by an American during her travels. OOPS We are busy updating the site for you and it will be back online shortly!. Although this hissing noise, sounds like a bad noise, it’s actually a good air conditioning noise. Anyways, now released is a whistlesound for the LB&SCR's No. Sign in to review and manage your activity, including things you’ve searched for, websites you’ve visited, and videos you’ve watched. Stock Engine-Bay Components; the hissing sound is air being pulled back into the tank. The sound of air hissing in the exhaust or out the tailpipe tells you the exhaust valve is leaking. it does help to lower intake temps. So it does appear when the vehicle is not moving and the RPM's are revving. the next day is when i also started to notice a hissing sound coming from the engine bay and when i shut the engine off it hisses slowly and sounds like it's winding down almost sounds like the turbo is spooling i've put my ear all around to try and pin point the sound and it seems to be coming from the middle of the valve cover. Symptoms of an intake manifold gasket leak include poor engine performance, engine overheating and coolant leaks. If the hissing is only heard after YOU shut off the car, it is likely a small leak in a vacuum hose. engine off, crawl under van and using the heel of your fist, thump on the convertor. F20 / F21 Model Year: 2012 + Previous Generations; E82 / E83 / E87 / E88 Model Year:. As long as you've been paying attention, nobody knows how your engine sounds better than you do, so if it starts to sound odd or even just a little different, there could be a problem. I got out, popped the hood, and nothing from there. don't worry if your car is not the same, most Japanese starter motors are very similar and this guide will get you through most of them. Here are a few useful tips on maintaining your Tecumseh small engine:. These hoses and pipes are directly exposed to the heat inside an engine bay, which can cause cracks in them and lead to. My TKS has been the EXACT same as you describe since she rolled off the showroom floor. -----If not for the sound instinct of a follow-up EPS officer one week later who did an impromptu search of the grounds her body would quite likely have remained unfound until it began to smell in the spring. Any time you have a vacuum leak an easy way to tell where it is take carb cleaner and spray it around the engine bay if you hear the engine rev you have a leak in that area to narrow down the spot. Historical Hawaiian natives and their culture in the ninteenth century as viewed by an American during her travels. To diagnose loss or vacuum, having inspected the various pipe unions in the engine bay, remove the left hand knee vent, identify the white (vacuum supply) pipe and detach it. Hey guys, I'm a recent new owner of 2017 Mazda3 Touring 2. If the noise only appears under high loads i. There are several possible symptoms commonly reported. and theoretically, since it makes the intake runners (tubes) longer, that should help you reach your max torque output sooner in the RPM band. If the smoke is coming from under your hood, that probably means you ignored white smoke coming out of the tailpipe, and now your engine is overheating. Three problems related to engine noise have been reported for the 2013 Chevrolet Sonic. There is also a hissing sound. Took it to a large garage near me for a look see and they instantly diagnosed a leaking injector. 6L V6 engine. It is not a whistle and seems much too high frequency to be described as ticking. A sound like this can suggest there is an issue with the braking system, especially if the sound happens whenever you apply pressure to the brakes. No rough idle symptoms and acceleration felt good. Not that loud but clearly audible if you go to the front of the car immediately af. It is sounding like air is escaping from the boost system somehow maybe?? Now at idle speed it really struggles not to stall-and the hissing sound only comes in at around 2500rpm-6000rpm's. Is this correct and reasonable?. Could this be an air leak? Ive attached a picture of a hose that goes to the carb from something behind the engine (forgive my lack of technical terms). I'm unsure if the air is continuously leaking, you definitely get a loud 'psshh' after stabbing the accelerator, it quietens after that and if it is continuing, it's drowned out by engine noise. My flex has been misfiring all the time ever seines the dealership did a timing chain and water pump. A plastic vacuum. Stopped working again last week. module is the two lines comin out the firewall from inside, the one that turns and goes. Yeah your intake will make a hissing noise you'll get used to it. So, I have 100K miles on a 2007 4Runner (V6) and after having my radiator flushed at the Toyota dealership service dept, I get my car back and now hear a low rumbling noise coming from the engine compartment. The leak allows additional air to mix with the fuel-air mix, causing the engine to run lean. In my case this occurred in the lower South Island, a long way from home, with a loud hissing sound coming from under the wing. I have found that the hissing noise coming from under the right side dash is air going back into the little oval tank, the tank and connection were actually fine, what caused my problem is the one way check valve under the hood, just underneath the comp. 0i engine bay hissing noise If this is your first visit, be sure to check out the FAQ by clicking the link above.