1993areo star. revs up and down in park after starting.

Marvin

• 85242 Answers
• Posted on Apr 13, 2009

SOURCE: idle irratic

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

SOURCE: 2004 stratus 2.7L Erratic idle, sometimes dies, sometimes revs at stops

hey-I have has this before different car but same - idle control valve is failing - computer at shop will pick this up on diagnostic

Alan Conner

• 359 Answers
• Posted on Feb 22, 2009

SOURCE: 94 honda del sol's engine revs up and down

I know exactly what you are talking about, it will go high to about 2 to 4k rpms, then back down to 1k in intervals of about 3 seconds. It is either the idle air position sensor, or the throttle body position sensor, hondas are famous for it. The parts are cheap, about $20-$30, and fairly easy to install when you find it. I suggest a Haynes Manual for installation to make it a lot easier if you don't know where it is. Good luck, hope all goes well.

SOURCE: Why is my car RPM idle up to 2 on the meter when

What type of car???? could be something in the computer/engine control system. if its a late model have it checked out could get worse

SOURCE: RENAULT LAGUNA MARK 1 IDLING PROBLEMS AND

I have the very same problem - Were you able to solve it ?

I've cleaned the Idle control valve several times and it seems to help overall but definitely not the cause ! - I think it might be the Coolant temp. sensor - have you tried changing that ?, did it work ?

Thanks mate - please let me know at [email protected] if you find a solution