jerks at decel
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Joined: Feb 2009
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From: walnut illinois
jerks at decel
i have a 2002 vette convertible roughly 80,000 miles on it a couple of years ago i installed varam and cat back exhaust and last year purchased diablo predator tuner the problem i am having is when driving say at 60 mph and let off accel to coast into town it will buck or jerk 2 or 3 times then on occassion when you come to a stop sign idles poor like 3-400 rpm and sometimes stall but starts backup no problem i forgot to mention has automatic trans also -no codes present -so yesterday i reinstalled stock tune and drove about 45 miles seemed ok but came to stop sign after being on interstate and had the bad idle again 3-400 rpm acted like it was going to die pushed o accel and was fine--dont mean to be long winded but trying to get accurate description anybody have any suggestions--thanks in advance
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Joined: Dec 1999
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Tom
The idle problem your having needs to be resolved FIRST!
Try cleaning the MAF with MAF cleaner. Remove it from the car and just spray it out and then let it evaporate. While its apart, clean the Throttle Body with carb cleaner and a paper towel. Push it open, spray it down and wipe out as much as you can. It will flop shut when your done but will NOT shut fully! Thats NORMAL!!!!
When you reassemble the air ducting, its CRITICAL that there are zero air leaks between the MAF and TB.
Then examine the PCV vacuum line and make sure that they are not worn or rotten. Very common problem. The rubber elbow on the passengers side behind the TB that goes from the valley cover to the manifold is known to rot and leak.
BC
The idle problem your having needs to be resolved FIRST!
Try cleaning the MAF with MAF cleaner. Remove it from the car and just spray it out and then let it evaporate. While its apart, clean the Throttle Body with carb cleaner and a paper towel. Push it open, spray it down and wipe out as much as you can. It will flop shut when your done but will NOT shut fully! Thats NORMAL!!!!
When you reassemble the air ducting, its CRITICAL that there are zero air leaks between the MAF and TB.
Then examine the PCV vacuum line and make sure that they are not worn or rotten. Very common problem. The rubber elbow on the passengers side behind the TB that goes from the valley cover to the manifold is known to rot and leak.
BC
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Joined: Feb 2009
Posts: 69
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From: walnut illinois
thanks for your reply i forgot to mention i also installed new maf sensor-but i did not clean throttle body-so i will do that-i also have not checked pcv hose or elbow so i will do that also thanks again
Burning Brakes
Joined: Mar 2008
Posts: 983
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From: Middle Of Kali CA
Factory or an aftermarket? If it is a Granatelli, you are having a tunning issue.
