IDLE problems

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Sep 22, 2004 | 02:37 AM

Aggie05

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From: new braunfels ,tx

IDLE problems

I recently was having idle problems with my bronco II, its an 89 2.9 4x4. I took off the air hose to the throttle plate and cleaned it up a bit cuz i thought it might of have been sticking. When i put it back together i have a even worse idle. Before i did anything it just started idleing high about 1800 to 2000 rpms, then after cleaning it jumped up to 3000rpms, i had to use my vehicle so i unplugged the plastice circuit breaker thing under the hood that disconnects the computer or whatever, this helped it brought the rpms down to ab out 1400 to 1500. I drove it for about 4 hours and it still reving to high, the adjusting screw is all the way down for the record. I am not getting any check engine light. Does anybody know what the heck i should check or do? IS there an idle sensor or something that could of gone bad? It seems to me its something electrical or soemthing but i dont know what. Any information or leads would be helpful. thx.

Sep 22, 2004 | 10:07 AM

mrshorty

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From: UT

The absence of the check engine light doesn't mean the computer can't see any problems. I would still start with the self-tests. It could very well come up all pass, but I'd verify it rather than assume it.
Any vacuum leaks? That would be the big cause of high idle, especially on these speed density systems.

Sep 22, 2004 | 03:46 PM

Aggie05

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From: new braunfels ,tx

OKay ill try checking the diagnostics tonight, but there are no vacuum leaks b/c thats what i suspected, but i cant see or hear anything!. IF any of yall have any more ideas to check let me know please, in the mean time im gonna run the self diagnostics.

Sep 22, 2004 | 07:41 PM

Ken00

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From: South Jersey

Make sure you run the KOER test.

Sep 24, 2004 | 03:58 PM

Aggie05

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From: new braunfels ,tx

I wAs talking to a ford mechanic and he said that the 89 bronco II's do not have a memory, therefore if i run a test it wont pick up anything unless my check engine light is on... IS this TRUE????

Sep 24, 2004 | 09:08 PM

Ken00

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From: South Jersey

The computer does have a memory, continuous codesa are stored in the memory. I'm not sure if the continuous codes will always cause a CEL.

Sep 26, 2004 | 07:23 PM

Aggie05

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From: new braunfels ,tx

Thx, Ken00 You were right about the b2's storing codes even though the cel isnt on. I went to auto zone sunday and they ran the test and it came back with a bad idle vavle thingy. Sorry forgot acronymn and what it stands for. Anyways its the small cilinder like valve attached to the upper intake on the passenger side with 2 bolts. I replaced it for 53 bucks and it runs like a champ took all of 10 mins and that was with autozones loan tools!

Thx again for everyones help.