High Idle Problem Fixed
August-5th-2002, 01:30 PM
#1
The Horns of Jericho
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Join Date: Feb 2002
Location: Southern Californ-I-A (909)
Posts: 320
High Idle Problem Fixed
Well, I believe I fixed my high idel problem.
I took my throttle body off yesterday so that I could swap out what I thought was a faulty IAC module. I thought I would just look at the TB itself and see if I could find anything at fault. I lifted the TB up, and I could see light shining through around the throttle plate. There is a little lock screw that holds the throttle plate from going back too far. I adjusted it, and it closed up some of the throttle plate gap, but not all of it. I guess I'll have to take it to a shop or grind it myself to have the plate close fully against the TB.
I know this is my problem, as I took the Gude throttle body I had sitting in my storage and put it on. It too had just a tiny, tiny, gap on the bottem of the plate, but it was a better fitting than the old one. I stuck that thing on, hooked everything else up (it had a IAC module on already), and tested out the idle. It was still idling high, so I adjusted the idle screw. Didn't help too much, so I let it run for a bit and the mashed the gas pedal. It sat at a lower rev, but still not around 800. So I mashed the pedal again, and it dropped down to 1000. Did it again, and it sat around 800.
I guess the throttle plate spring needs replacing.
So, my problem was a matter of the throttle plate not closing flush against the throttle body.
Jesse asked me if this was the case, but I guess I really didn't check. :\
So for any of you that have a high idle problem, check to see if the throttle plate is sitting flush. Use some carb cleaner to clean the throttle bore, but try and avoid spraying the cleaner on the TPS and IAC module. Hold the TB towards the sun so you can really check and see if there is a gap. Adjust the screw. If it still doesn't close, take the TB to a machine shop.
Now, whether my car passes smog is another question.
Edit: Also, if you adjust the stop screw for the throttle plate, you may have to adjust the TPS. The TPS can prevent the plate from turning.
Thanks to BigMike and Jesse for their help!
I took my throttle body off yesterday so that I could swap out what I thought was a faulty IAC module. I thought I would just look at the TB itself and see if I could find anything at fault. I lifted the TB up, and I could see light shining through around the throttle plate. There is a little lock screw that holds the throttle plate from going back too far. I adjusted it, and it closed up some of the throttle plate gap, but not all of it. I guess I'll have to take it to a shop or grind it myself to have the plate close fully against the TB.
I know this is my problem, as I took the Gude throttle body I had sitting in my storage and put it on. It too had just a tiny, tiny, gap on the bottem of the plate, but it was a better fitting than the old one. I stuck that thing on, hooked everything else up (it had a IAC module on already), and tested out the idle. It was still idling high, so I adjusted the idle screw. Didn't help too much, so I let it run for a bit and the mashed the gas pedal. It sat at a lower rev, but still not around 800. So I mashed the pedal again, and it dropped down to 1000. Did it again, and it sat around 800.
I guess the throttle plate spring needs replacing. So, my problem was a matter of the throttle plate not closing flush against the throttle body.
Jesse asked me if this was the case, but I guess I really didn't check. :\
So for any of you that have a high idle problem, check to see if the throttle plate is sitting flush. Use some carb cleaner to clean the throttle bore, but try and avoid spraying the cleaner on the TPS and IAC module. Hold the TB towards the sun so you can really check and see if there is a gap. Adjust the screw. If it still doesn't close, take the TB to a machine shop.
Now, whether my car passes smog is another question.
Edit: Also, if you adjust the stop screw for the throttle plate, you may have to adjust the TPS. The TPS can prevent the plate from turning.
Thanks to BigMike and Jesse for their help!
Last edited by zenilder; August-5th-2002 at 01:56 PM.
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