Question about 1998 Mitsubishi Eclipse

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Idling Problems I have a 1998 Eclipse GS-T. The other night I drove the car without problems and parked it for about 6 hours. When I went to turn the car on, it acted like the battery was dead. We got a jump, the car started, and I started driving, but every time I took my foot off the gas it wanted to stall out. I ended up driving it home reving the engine the whole time. My husband had the aternator/voltage regulator checked, it was fine. My battery tested dead however, so we replaced it. Additionally, the alternator belt was changed also. The car was working perfectly this morning, but I just drove it and it doesn't want to idle smoothly. When I slow down or sit at an idle, the rpm's dip way down and then work their way back up to around 1,000. Is there anything else we can check/change?

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Besides the throttle positioning sensor, the crankshaft sensor, the O2 sensor, and a bad or clogged EGR valve will cause this problem. These sensors can have an intermittent problem without producing a code or causing the check engine light to come on. Persona;ly, I would start with the EGR valve.

Posted on Jul 18, 2008

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The rise in idle at startup and then a slowdown indicates possibly a throttle position sensor, sticking choke or a vacum leak. the TPS and choke is something that will have to be checked by a tech, the vacum leak can be found by starting the car and sticking your head under the hood and listen for a hissing noise that sounds like air escaping somewhere......if you can find it, and put your hand or fingers over the leak, the idle should rise and then you'll know that's your problem. this is entirely possible due to the age of the car, the number of miles on it and the fact that most of the vacum attachments usually use rubber hoses which will deteriorate over time and cause these types of problems

Posted on Jul 18, 2008

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