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Problem with dropping RPMS

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Old Feb 21, 2007 | 12:41 AM
  #1  
clayton02LS1's Avatar
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Default Problem with dropping RPMS

Sometimes my car will have a good clean start, other times it will go like this- I start it, and it will drop down to around 400 RPMS (barely running, lights dimm) then it will climb back to idle (around 900 RPMS) within 10 seconds. Tap the gas then it'll act like it wants to die again! Any suggestions as to the problem?
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Old Feb 21, 2007 | 12:55 AM
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Vaccum leak. I think your cars have an AIC. If so then that is another thought of the top of my head. Im an LT guy so?
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Old Feb 21, 2007 | 08:33 AM
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Take the IAC valve off the TB and clean it with carb cleaner.
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Old Feb 21, 2007 | 11:03 AM
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So this is nothing electric? If it helps there's also a noise that accompanies this. It sounds like a turbo on my car. Like when I get on the throttle it winds up, and when I get off the throttle, it winds down. Now that I think about it it does sound like a vaccuum problem.

Last edited by clayton02LS1; Feb 21, 2007 at 11:13 AM.
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Old Feb 24, 2007 | 02:35 AM
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What about your air filter? When is the last time you cleaned it?
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Old Feb 26, 2007 | 06:28 PM
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Originally Posted by Weezzer
Take the IAC valve off the TB and clean it with carb cleaner.
+1

Seems like eventually I have to do this on every car I've owned.
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Old Feb 26, 2007 | 07:56 PM
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newbie question. Where is the IAC at on the throttle body.
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Old Feb 27, 2007 | 02:19 AM
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If you are standing infront of the throttle body looking towards the engine. You will see it on the right side above the TPS, it has 2 Torx screws, and when you take it out it has a spring and cone shaped plunger inside it.
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