Question about 1999 Acura TL

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Engine revs up and down

I have 1999 Acura TL and in park or neutral it will rev up and down, once in drive it runs great, the check engine light is on, and when i come to a stop it has a slight surge.

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Sounds like a bad IAC motor, or a vaccuum leak, or low coolant... I would definately start with checking these things first

Posted on Jan 26, 2009

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Get the car pass on a scanner the check ngine light is probably idle air control valve the first thing to do is get the scanner pass on the car before changing parts for nothing let me now how it turn out thank you and good luck pierre

Posted on Jan 26, 2009

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My 2002 Acura tl revs while in park and in drive, check engine light just turned on as well.


The throttle body and idle air control motor needs a good cleaning. Use brake clean and a toothbrush and clean inside the throttle as best you can. especially the back of the throttle plate and where it sits against the throttle body. Start the car, it will take a second or so. Then rev it up and spray some cleaner in the throttle keeping it running. This usually takes care of the up and down RPM's. Have the codes checked to see what is going on. It could be the idle air control motor. Let me know.

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Hello
The engine and automatic transmission in this vehicles drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM

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Thanks,
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