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Guest Message by DevFuse

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Idle Questions

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1 reply to this topic

#1 the_bard


    Upstate NY'er

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  • 941 posts
  • Rexford, NY

Posted 26 February 2004 - 12:51 AM

While I'm planning stuff for this swap, I'd figure I'd throw this out, too. Put it on my list of things to do, at least.

I've been following all the different threads on idling, surging, throttle problems, etc., on these SPFI EA82's. Mine seems to be a bit unique, and I've got a list of things I'm going to replace/inspect/repair while I'm doing the swap, but I figured I'd dangle it out anyhow.

Seems to be two problems, separate, but possibly related. First: On initial start, the engine will start to hit approx. 2,500 RPM's. Blip the throttle, and she drops down to about 1,750. Once it warms up, it'll idle anywhere from 600 to 1,100 RPM's, apparently randomly. I've noticed that it takes a few seconds for the idle to settle, too... come up to a stop sign, and it'll drop to about 1,200, then start to settle down to 600 to 1,100 after a few seconds.

Second: Every now and then, roughly about once every two weeks, I'll come up to a complete stop, wait about five to ten seconds at an idle, then the idle will start surging and dropping. Down to 500, up to 1,250, back down again. Blip the throttle above 1,500, and no problem. Let off the throttle, and she may start the surging again, may not.

Not a large pressing issue (I figure it's gotta be the reason for my bad mileage, but it's not horrible), but I figured I'd take care of it while I was doing the swap. At this point, I'm figuring it's gotta be one of a few things...

1. FI coolant temp sensor, reporting an invalid engine temp back to the ECU. (Fix: replace)

2. Gummed up idle air control valve. (Fix: Clean first, then replace)

3. Throttle Position Sensor (Fix: Replace)

4. Vacuum leak. (Fix: Find it first.)

Whatchy'all think?

#2 MilesFox


    Catch this Fox!

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  • Madison/Milwaukee, WI

Posted 26 February 2004 - 02:41 AM

check the MAF too.you can take the electrical prt off the housing, but be carefu, as there are 2 filaments inside. check the filaments to see if they are broken

jims wagon ran like dook, the MAF had a bad filament, replaced that, and it ran half like dook. we cleaned he IAC valve, but no effect

replaced the throttle sensor, and ALL GOOD NOW. the old one would rattle when you shook it

maybe it would be cheaper to get a whole intake assembly from a known running car, rather than buy each component separately?

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