surging idle, bad hesitation only when cold?
Thread Starter
Pro
Joined: Aug 2002
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From: the corner of walk and dont walk
surging idle, bad hesitation only when cold?
car has set code 32, and since has been idling at 600 then goes to 950, then back down to 420, back up to 800. It also has a bad hesitation and with spit back through intake if you try to stab the throttle. :confused: It only does this when the engine temp is below 170-180. I have no clue! :confused: Any suggestions or advice is greatly appreciated. Thanks in advance. :cheers:
I just wondered, could the oxygen sensor do this?
[Modified by sinistervette, 7:56 PM 9/22/2002]
I just wondered, could the oxygen sensor do this?
[Modified by sinistervette, 7:56 PM 9/22/2002]
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Joined: Aug 2000
Posts: 14,130
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Re: surging idle, bad hesitation only when cold? (sinistervette)
Hey Sin,Me again,
If the EGR valve is sticking or leaking,it will cause stumbling and stalling when warming up.
What EGR does is it helps cool the combustion chambers to reduce emissions,but isnt supposed to be flowing egr gasses when the car is cold and warming up.The,with a cold motor and EGR gases coming through,it wont warm up right.
At least thats how I got it thought out.
Unplug the vacuum line off the EGR valve and put a vacuum cap on it then go for a test drive.If the symptoms improved,you got a bad EGR Valve...but do check to see
if possible,if the valve is stuck in the pper or lower postion.You may need a small mechanics mirror and a flashlight to see the valve plate.
On other cars,I was usually able to use my fingers and push the plate up or down on the valve to see if it was sticking or stuck.
:)
If the EGR valve is sticking or leaking,it will cause stumbling and stalling when warming up.
What EGR does is it helps cool the combustion chambers to reduce emissions,but isnt supposed to be flowing egr gasses when the car is cold and warming up.The,with a cold motor and EGR gases coming through,it wont warm up right.
At least thats how I got it thought out.
Unplug the vacuum line off the EGR valve and put a vacuum cap on it then go for a test drive.If the symptoms improved,you got a bad EGR Valve...but do check to see
if possible,if the valve is stuck in the pper or lower postion.You may need a small mechanics mirror and a flashlight to see the valve plate.
On other cars,I was usually able to use my fingers and push the plate up or down on the valve to see if it was sticking or stuck.
:)
Thread Starter
Pro
Joined: Aug 2002
Posts: 702
Likes: 1
From: the corner of walk and dont walk
Re: surging idle, bad hesitation only when cold? (Bill's86Coupe)
Hi Bill,
Thanks for the advice. I'm going to unplug the egr when I go to work in the morning, and I'll see what happens. Thanks again. :cheers:
Thanks for the advice. I'm going to unplug the egr when I go to work in the morning, and I'll see what happens. Thanks again. :cheers:
