What’s going on impala family I have a 2003 Impala Ls 3.8... I been having this turbo like whistle for a min now & I could never pin point where exactly it was coming from. If you rev it you can hear it a lil bit but when you drive that’s when you hear it. I cleaned the throttle body before I started hearing this noise btw & while I was cleaning it did kickback on me like a pop or something... Okay now I have a Jmb fender well Intake & and now you can hear it louder. It sound like a lot of air is being released when I press the pedal a lil hard... the intake helped me out a lot because now the hissing sound is coming from under the car the only thing I didn’t check to see where the hissing sound coming from yet that’s causing this noise... Any Ideas? It makes my car clunk when taking off a lot now ever since I put the Jmb fender intake in
So it was not doing this before cleaning the tb? With what you post, it sounds like maybe something is not seated right with the tb or something not tight with the new intake setup and it is drawing unfiltered air from that opening.
I replaced the throttle body gasket twice that didn’t change anything but when but when you rev car under hood you hear the whistle but not as much but if you sit in car when door open & rev it you can hear it coming from under the car... you can hear the hissing sound ( not the sound from the intake)
I recall working on my son’s 2004 Grand Prix GT with the non-supercharged 3.8 engine (now gone) - fully stock with no modifications. This was the W-Body, like your Impala.
There was a hard black plastic, curved air tube, which went behind the engine (near the cowl / firewall). I recall it being loose or knocked-off when we did some work on it. It was somewhat centered between the two fenders, at the rear of the engine. The fitting was somewhat sloppy and not tight, and it was easy to dislodge.
Perhaps check there?
Also - are you aware of the PCV valve set-up, under the black, hard plastic fitting? The PCV valve has two different size o-rings, which if not present, would cause an air sucking sound.
Working from distant memory - it was some type of fresh air or vacuum tube (may 1/2 inch or less in diameter). It could be seen and reached while standing by the driver (left) side fender, and reaching behind.
I wish I could remember more to help, but I recall the hiss noise when it was dislodged.
Did anybody ever give you a good answer? I've read them all and I don't see a specific answer to what seems to be a common problem. Mine is near exactly what you describe except I would call mine a vaccum sound to be sure. And I'm certain it's coming from the air intake. I'm reworking from air intake to throttle body now, but along the way, I've notice that the air filter case seats with a gap so previous owner of my 03 Impala LS 3.8 l V6 out weather stripping to create a seal. However, the stripping looked like it had a decade of wear and tear on it. I peeled, scraped and cleaned it all off and took us cue reviving the same concept. I even used a sealant and added the rubber moldable stripping on top of foam stripping and outside of the casing along the crease. The vaccum sound remains. I'm about to clean the Mass Airflow Sensor. Questioning MAP sensor, O2 Sensor and also wondered if the problem is inside air intake casing where the intake tubing meets? So far I change the PCV valve the spark plugs the spark plug wires the air filter and then the sealant job on the air intake casing. I enjoy fixing shit, but this problem has my hobbies time slot all filled up, only this one isn't profitable. . A little help please?
I have a 2016 v6 impalla this problem its like short blow or a suck from behind or inside that plastic intake. Almost like a misfire just when I slightly tap the throttle it's consistently the same. I tried smoke but couldn't see any obvious suction Or blowing. Any ideas ? My first thought was a vacuum line off.
Good luck
Hello, this is as close to a Description as I have read. My buddies 2016 impalla has the poof or suck either inside the Intake or a line off the back. This poof happens only when trying to ease the gas pedal down lightly
Yes ! Exactly. A poof, a suck ? It's loud and only when easing and the very first second of pushing the pedal. It will make a light clunk sound like an actual real hesitation may happen but still runs out strong. Any advice ?
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