Rough Idle during Warming Up

- Z
- ZR
  
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posted
17 years ago

Wed, Dec 27, 2006 10:30 PM

I have a 1990 Camry. The idle is very rough during warming up. Engine speed would suddenly increase to very high for a few seconds and drop back to near stall. It will repeat this before it's completely warned up (20-30 minutes of driving in cold days). The engine will stall if this (surge and drop) happens during acceleration. It only happens during warming up. It does not happen if the engine is completely cold (first couple of minutes of cold start) or completely warmed up (hot).

Does any one have any suggestions where I should start?

Thanks for any help!

Have a nice holiday!

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- D
- davemac
  
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Vote on answer
posted
17 years ago

Thu, Dec 28, 2006 5:40 AM

what engine? I4 or V6? You can start by attempting to clean the throttle body and in particular the IAC (idle air control). If the V6, check that the intake hose from the air filter is not cracked in the creases. Check the EGR valve and the ECTS (engine temp control sensor) to make sure they are functioning ok.

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