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popping/dying when accelerating

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Old 09-01-2008, 12:45 PM
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Originally Posted by viciousknid
I always carry jumpers and the battery shows 0 signs of weakening, but I try to keep enough money in the bank to fix anything that breaks.



He's tuned for every mod he has. How would he just all the sudden go rich out of the blue?
doe this answer your question

Originally Posted by dlt76028
i recently put stock manifolds and cats back on... bad o2 sensor?
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Old 09-01-2008, 02:55 PM
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Originally Posted by 7845
your truck is rich. to have fuel trims like you do you need to lean out the motor. if you went from headers to manifolds then you are rich. when you go from manifolds to headers you run lean. its just the opposite

have someone play with your VE table for little bit of time and be done

popping and sputtering is direct relation of overly rich
i thought it was just the tune too, but we added fuel and took fuel out and the trims didnt change either way.
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Old 09-01-2008, 02:58 PM
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Originally Posted by 7845
doe this answer your question
yes it does. I re read it twice and didn't pick that up.
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Old 09-02-2008, 12:02 AM
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Originally Posted by dlt76028
i thought it was just the tune too, but we added fuel and took fuel out and the trims didnt change either way.
well if you are overly rich then adding fuel wont help. now if you removed fuel from a table that is too rich after you added fuel to it then your not improving.

now are your 02s reading correctly? if they are resposive like normal and reading exceesive values of fuel trims then i would still play with VE till numbers came in order. but make sure you save each file as you do this so you dont get to far out of order incase this doesnt help any
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Old 09-02-2008, 02:36 PM
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Originally Posted by 7845
well if you are overly rich then adding fuel wont help. now if you removed fuel from a table that is too rich after you added fuel to it then your not improving.

now are your 02s reading correctly? if they are resposive like normal and reading exceesive values of fuel trims then i would still play with VE till numbers came in order. but make sure you save each file as you do this so you dont get to far out of order incase this doesnt help any
we took fuel out from where it is now and that didnt change at all. i just put 2 new o2s in it and it helped the driving but when it idles to long its starts up again. and today i floored it on the highway and the engine light came on and the truck went into limp mode and popped and wouldnt drive normal
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Old 09-02-2008, 02:41 PM
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Whats the code?
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Old 09-02-2008, 03:17 PM
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Originally Posted by BlackGMC
Whats the code?
not sure i barely made it home but i'm thinking it tripped a lean code maybe from the fuel pump going lean up top
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Old 09-02-2008, 05:09 PM
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you need to keep this truck on a scanner till you figure this issue out or else you might hurt it. a scanner will tell you if 02s are working, fuel is rich or lean, and tell you if pump might be failing
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Old 09-02-2008, 05:23 PM
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Originally Posted by 7845
and tell you if pump might be failing
What do you scan to see if the pump is failing?
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Old 09-02-2008, 05:47 PM
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Originally Posted by BlackGMC
What do you scan to see if the pump is failing?
duty cycle illregulartivity. do muliple scans, and if the duty cycle changes noticably between each scan especially in higher rpms where load would be greater. then a sign of weak pump
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