Checks Engine Light

[openwater]

'99 2.5L w/ 54k miles...

Check engine light came on yesterday. Today idle started elevating to 1000rpm from the usual 800rpm. Occasionally dropped to 825 or so then immediately went back up to 1000.

I'll put it on a OBD this weekend, but any guesses?

[mrmickeymouse]

Vacum Leak.... Did you do any work prior to this problem starting up.

Scott

[openwater]

Replaced the air filter about a month ago. Replaced the coolant tank two weeks ago. Replaced the Parking Brake sensor last week...

[mrmickeymouse]

I didn't even notice, it was you, Sorry Hi..

Maybe during the tank change you hit some vacum lines, you really need to dig in there to get to the back hoses; if I read the article right.

I was wondering how you were doing, did you ask Ken or Mike at Scott's.

You can use carb cleaner to ferret out the leak, spray it around sparingly and it will raise your idle or make it make it drop, when it hits a leak, I have seen both.

Be careful though it has ether in it. Poof....

If you need more help give me a buzz....

Scott

[openwater]

Started looking for the cause of my idle fluctuation and CE light. Found that I had not replaced the oil filler cap when I topped off.. :censored: Replaced the cap and the idle came in line later that day. CE is still on so continued looking for the cause.

Reviewed my service records and realized that the spark plugs hadn't been changed at 30k. Replaced them this morning (at 54k) with the 2-prong Bosch plugs. What a difference! Dramatic improvement on steadiness of idle, and performance while decelerating (and accelerating). Not too difficult a job, thanks to informative posts on the Forum...

One question on the plug change... just to the left and above of cylinder #4's (more rear, right) coil is some sort of sensor that screws (or snaps) into the head? Mine is very wet with oil; what is it?

Thanks