Lean stumble at steady speed
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Burning Brakes
Joined: Oct 2003
Posts: 816
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From: peabody ma
Lean stumble at steady speed
keep getting a lean stumble at steady speed/throttle and more so when i just back off the gas a bit (not fully comming off the gas) its getting worse and driving me nuts...car runs fine under power and im reading my A/F with an AEM setup....car runs its normal 14.6-14.9 at cruising, but then spikes into the 15s and i feel the stumble...it also stumbles a little at idle but i dont see the lean spike...my wide open is around the 12.5-12.7 range..
No codes and I have changed the plugs, wires checked for vacume and intake leaks..any ideas on what usually causes this..
car has headers, hi flow cats, borla exhaust and predator custom tune,
thanks in advance
jack
No codes and I have changed the plugs, wires checked for vacume and intake leaks..any ideas on what usually causes this..
car has headers, hi flow cats, borla exhaust and predator custom tune,
thanks in advance
jack
Last edited by gsxrjack; Oct 18, 2008 at 07:21 AM.
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 816
Likes: 0
From: peabody ma
Thread Starter
Burning Brakes
Joined: Oct 2003
Posts: 816
Likes: 0
From: peabody ma
put the stock tune back in the car and the stumble is gone 
....I may have had my long term banks way out of wack...just put in a new mail order tune from diablo (thank you sirs) and will try to tweak it in from there, using the predator and the aem a/f setup...
thats why i am glad i have the predator since there are only a few things that i can mess up...god help me (and the car) if i ever had a hptuner or one of those things that i could mess with every little detail of the engine
it is also a good thing with the a/f meter so i can see if i get dangerously lean..
i know i said i put the stock tune back in but must not have :o
....I may have had my long term banks way out of wack...just put in a new mail order tune from diablo (thank you sirs) and will try to tweak it in from there, using the predator and the aem a/f setup...thats why i am glad i have the predator since there are only a few things that i can mess up...god help me (and the car) if i ever had a hptuner or one of those things that i could mess with every little detail of the engine
it is also a good thing with the a/f meter so i can see if i get dangerously lean..i know i said i put the stock tune back in but must not have :o
