searching for idle
Thread Starter
Instructor
Joined: Jul 2005
Posts: 129
Likes: 0
From: Austin Texas
searching for idle
When my 1985 goes into closed loop it won't idle. The idle will surge up to 800 or 900 rpm then drop off almost to stall at 300 or 400 rpm. happens alot in stop and go traffic. any suggestions???
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Pro
Joined: Nov 2006
Posts: 545
Likes: 0
EGR exhaust gas recycle
Could be EGR valve in intake,(this valve controls idle)possibly has debris in it.
Expensive to replace, buy some GM intake cleaner (spray bomb)and follow instructions to the letter.
I just did this on my 4.3 vortec(same symptoms) and it has never run so good.Took about 30 minutes.
You've only got 10-12 bucks to lose and if it doesn't solve it the improved mileage is payback aftera coupla tanks.
Expensive to replace, buy some GM intake cleaner (spray bomb)and follow instructions to the letter.
I just did this on my 4.3 vortec(same symptoms) and it has never run so good.Took about 30 minutes.
You've only got 10-12 bucks to lose and if it doesn't solve it the improved mileage is payback aftera coupla tanks.
Team Owner
Joined: Jan 2003
Posts: 20,301
Likes: 240
From: Summerland B.C. Canada
Since your in Austin,Texas, I don't think it will be too hard to find a member here, that can put it on Datamaster or similar.
Sure makes it easier when you can see what the ECM is seeing/doing.
Sure makes it easier when you can see what the ECM is seeing/doing.
Racer
Joined: Jul 2007
Posts: 478
Likes: 1
From: Nesquehoning PA
Could be EGR valve in intake,(this valve controls idle)possibly has debris in it.
Expensive to replace, buy some GM intake cleaner (spray bomb)and follow instructions to the letter.
I just did this on my 4.3 vortec(same symptoms) and it has never run so good.Took about 30 minutes.
You've only got 10-12 bucks to lose and if it doesn't solve it the improved mileage is payback aftera coupla tanks.
Expensive to replace, buy some GM intake cleaner (spray bomb)and follow instructions to the letter.
I just did this on my 4.3 vortec(same symptoms) and it has never run so good.Took about 30 minutes.
You've only got 10-12 bucks to lose and if it doesn't solve it the improved mileage is payback aftera coupla tanks.
Pro
Joined: Nov 2006
Posts: 545
Likes: 0
Test drive
P.S. After letting it sit for 15-20 min. Take it out on a quiet back road,for a ten min run.
I hit passing gear about 4 times in 10 min, drove home and it idled perfect every since. (2 mths now)
GOOD LUCK POST YOUR RESULTS!!!!!!!
I hit passing gear about 4 times in 10 min, drove home and it idled perfect every since. (2 mths now)
GOOD LUCK POST YOUR RESULTS!!!!!!!
