Car idles at 2000rpm when cold!!

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03-28-10 | 11:05 PM

#26

Puck

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From: Terrace Bay, Ontario

Still running all your pollution control? If so, try unplugging the colored solenoid plugs, one by one, to see if any of them affect your idle. Sometimes the air control valve, etc, leak air by, and screw up the idle.

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03-28-10 | 11:20 PM

#27

Makenzie71

Thread Starter

...94% correct.

Joined: Oct 2002

Posts: 1,283

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From: High Texas

I'll try the solenoids tomorrow. I can't wait until I tear down the intake and fix my 5/6 port sleeves....hopefully I'll be ridding myself of all the emissions crap and replacing a lot of exhaust gaskets so the thing doesn't reek anymore....

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03-29-10 | 01:41 AM

#28

turboIIrotary

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From: dayton,ohio

Quote:

Originally Posted by Makenzie71

I've heard the TPS could cause the surging idle, but it's my understanding that it causes the surging idle at all times. Not just when the car is in gear.

my vert surged in gear and i changed my tps and it is fine now.

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03-29-10 | 06:52 PM

#29

calpatriot

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Joined: Aug 2009

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From: Los Angeles

Quote:

Originally Posted by mxrider914

I had a problem somewhat similar to this and it ended up being the thermowax. The coolant passages were clogged so it was holding the throttle open a little when warm because it wasn't melting. Which from what i understand caused the cpu to make the timeing advance and cause the idle to surge.

I turned the screw all the way in and it idled fine, just have to give it some gas sometimes when cold to keep it from dieing. Anyone else think that might be the OP's problem?

It seems likely. It would almost have to be one of the three: AWS, BAC, or fast idle cam/thermowax. But the AWS should put the idle up to 2500-3000, and then only for 17 sec, so that does not seem consistent with the symptoms. Since the BAC is active when warm, and the fast idle cam is not, the fact that it smoothes out when warm points to the fast idle cam/thermowax.

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04-08-10 | 08:31 AM

#30

Makenzie71

Thread Starter

...94% correct.

Joined: Oct 2002

Posts: 1,283

Likes: 2

From: High Texas

Just to update...definitely was a TPS issue. I don't have any LED's around and at the time I didn't have a voltmeter so I did some blind tuning. Pulled the screw out two full turns and now she idles closer to 1500rpm cold, 800rpm hot, no fluctuations in or out of gear. Need to get the meter out, though, and set it proper.

Now I just need to sort out the popcorn idle...

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