Mister96

Ok so hoping to get somewhere here with this. I have a 96 Impala and when sometimes idling my rpms shoot up like crazy then go back down. It'll start at 1,000 and then shoot up to 1,500 then drop back down to about 900 or 800 rpm and would continue to do so. And this problem also sometimes occurs when at a red light. Rpms will rise and I have to step on the brake fully down so I won't hit the car In front of me. Any help with this problem? Thanks for any suggestions!

463

1996 CHEVROLET IMPALA Idle Air Control (IAC) Valve
Idle Air Control (IAC) or it is carbon around up around the iac valve and seat area.. You could try a good soak of carb cleaner, deep creep from sea foam or straight sea foam may be the first starting point before you get into replaceing the ica. If you do have ti iac valve unpluged or removed there is a relearn program to get it to run right.

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Mister96

Is replacing the iac any complicated? Cause from the looks of it, wouldn't you have to take off the throttle body to get to it?

SuperSport

Nope. Look on the passenger side of the throttle body. You'll see. Easy R&R.

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'95 Impala SS --- Low Budget Mods... More to come!

Mister96

I ask cause I have never worked on these cars. This is my first car and I am the third owner that is changing everything on it. All parts on this 96 Impala were all stock bone from when it rolled off the line in 1996. Until it got in my hands when i started replacing parts. So any advice on replacing it would help.

SuperSport

You'll see something like the attached pic screwed to the passenger side of your car's TB. Remove the electrical connector, unscrew the two screws, and pull it. Wipe it down, and the TB port where it sits, reinstall, and try it out. If you prefer to replace the part instead, I think these normally run $25 - $35. But, I'd try what 463 mentioned in Post #2 first.

Good luck!

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'95 Impala SS --- Low Budget Mods... More to come!

Crime Scene

One other thing that comes to mind would be the Throttle Position Sensor. A faulty one will cause idling problems and throw the transmission off because it wouldn't know when to shift. Also located on the throttle body and is the second sensor directly on top of the IAC sensor.

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2001 Chevy Impala 3.4 - Traded
2004 Chevy Impala 3.4 - Traded
2002 Chevy Impala 3.4 - RIP 1.12.2011/ Ice Storm
1996 Chevy Impala SS - RIP 4.15.2012/ Asswipe
1996 Chevy Impala SS - Current

Mister96

Thanks for both of you alls advice. I would ask my older brother..but he's just a plain d**k when it comes to me asking stuff about this. Will try and see if possible fix that this weekend wig my old man. Since I will be messing around the TB wouldn't it be ok to clean that too with some carb cleaner??