Advanced issue....
Advanced issue.... all new...spark plugs, wires, knock sensors, maf, map, IAC, fuel filter, no shorts or bad grounds...motor is strong with only 30k on it...
car is running very rich with low spark on passanger side bank, drivers bank is perfect...i cant find the issue, GM cant find the issue, my local guy cant find the issue...so...its your turn
car is running very rich with low spark on passanger side bank, drivers bank is perfect...i cant find the issue, GM cant find the issue, my local guy cant find the issue...so...its your turn
TECH Fanatic
Joined: Aug 2006
Posts: 1,407
Likes: 63
From: Knappa, Oregon
Bad coil on the passenger side? Swap coils to see if problem moves. Injectors electric connections all good? Injectors themselves been checked? Do you still have O2 sensors or simulators, or have they been tuned out?
Not to argue, but are you reallllly sure there are no short or grounds issues? Just asking. The problem would seem to be electrical in nature and isolated to the passenger bank. Which you already figured out, I know.
Not to argue, but are you reallllly sure there are no short or grounds issues? Just asking. The problem would seem to be electrical in nature and isolated to the passenger bank. Which you already figured out, I know.
i personally dont have access to tech two...GM's arguement when they had it was that it had an aftermarket tune and they couldnt tell the difference in what was supposed to be there and not ???....efi live has been on it and ive seen that, ive had this tune on this car for over a year and never had an issue...all coils have less then 12k miles on them, replaced them last summer, shorts have been checked to all the major sensors that would cause effect by voltmeter, ground wires are secure...o2s are BRAND new,...its hard for me to believe a whole side of injectors would go bad and start dumping fuel...
the only thing i could possibly come up with is that the pcm has become corrupt, when the problem first arose a few months ago...the tune when scanned looked totally different then when it was flashed last year...and NO ONE has had anything hooked up to my car...ive gone through and looked for any lines or metal that might be knocking and pulling timing...nothing
the car is very simple as ls1's come...no ac, no air pump, no egr, front o2s only rears deleted, i just put in a new rack not long ago and that is secure...i probably will order a pcm through my shop in the next few days and just have that flashed to my tune and see what happens from there...if i cant figure this out, you might be seeing my car in the for sale section...
the only thing i could possibly come up with is that the pcm has become corrupt, when the problem first arose a few months ago...the tune when scanned looked totally different then when it was flashed last year...and NO ONE has had anything hooked up to my car...ive gone through and looked for any lines or metal that might be knocking and pulling timing...nothing
the car is very simple as ls1's come...no ac, no air pump, no egr, front o2s only rears deleted, i just put in a new rack not long ago and that is secure...i probably will order a pcm through my shop in the next few days and just have that flashed to my tune and see what happens from there...if i cant figure this out, you might be seeing my car in the for sale section...
Tried swapping in a new O2 on the bank running rich? Some other ideas, check for intake or exhaust leak on the pass side. False air to a good O2 sensor could trick the pcm into adding fuel to that bank only. Also, not trying to question, but how have you determined that that bank is running rich?
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Didn't you have a problem once with the plugs you used to plug the AIR fittings on your headers leaking? Don't ask me why I remember that. But that is a possible spot for an exhaust leak.
keepm coming though 
Try swapping the O2s, and see if the problem switches sides. It is possible to get a bad or lazy O2 out of the box, especially aftermarket parts.
Do the same with the coils, to rule them out - though they are typically very reliable.
Then do it with the injectors - more common, could be dirty - VERY common.
I bet you after the above 3 tests, you are closer to the issue.
An intake leak could be the culprit, though that usually makes 'em go lean and on both sides, so not likely IMO but possible.
Do the same with the coils, to rule them out - though they are typically very reliable.
Then do it with the injectors - more common, could be dirty - VERY common.
I bet you after the above 3 tests, you are closer to the issue.
An intake leak could be the culprit, though that usually makes 'em go lean and on both sides, so not likely IMO but possible.
i would definently say this is a 02 sensor problem! few months ago i replaced a bad o2 sensor with a new Ac delco unit, after putting that new o2 in (bank 1) it threw codes for running to lean and low voltage! so the system made my car run rich as hell in bank 1! it took me forever changing seals and gaskets checking injectors, after all that i found out that it is my brand new 02 that i just put in! and because of me running rich, i was told my drivers side cat had clogged! so here i am in california running gutted cats all because of a 02 sensor. as soon as i replaced that sensor everything went back to normal! also try checking the intake manifold seal, egr to intake seal, injectors,
love the input but fellas, it isnt an o2 problem...that side has been changed 4 times in the last month...(get them free with the warranty)
and its the whole right side bank, so one injector or one coil wouldnt be doing it...and its hard to believe that WHOLE side is bad...im at work now and the car is up on the lift...looking for leaks as we speak...this is probably going to be the best guess...however it could also be a bad pcm...
and its the whole right side bank, so one injector or one coil wouldnt be doing it...and its hard to believe that WHOLE side is bad...im at work now and the car is up on the lift...looking for leaks as we speak...this is probably going to be the best guess...however it could also be a bad pcm...
nope...i have seen pcm become corrupt or short and not hold tunes...
HOWEVER!!?!!1!!1!!!!
ive pretty much found the problem...theres a pin hole on my weld on the top side
see picture below, i never would have noticed until i saw that black smudge...there was no ticking and with my duals running i wouldnt have been able to hear it anyways...but i felt it right up there...gonna unbolt the system tomm and weld it back up
HOWEVER!!?!!1!!1!!!!
ive pretty much found the problem...theres a pin hole on my weld on the top side
see picture below, i never would have noticed until i saw that black smudge...there was no ticking and with my duals running i wouldnt have been able to hear it anyways...but i felt it right up there...gonna unbolt the system tomm and weld it back up
nope...i have seen pcm become corrupt or short and not hold tunes...
HOWEVER!!?!!1!!1!!!!
ive pretty much found the problem...theres a pin hole on my weld on the top side
see picture below, i never would have noticed until i saw that black smudge...there was no ticking and with my duals running i wouldnt have been able to hear it anyways...but i felt it right up there...gonna unbolt the system tomm and weld it back up
HOWEVER!!?!!1!!1!!!!
ive pretty much found the problem...theres a pin hole on my weld on the top side
see picture below, i never would have noticed until i saw that black smudge...there was no ticking and with my duals running i wouldnt have been able to hear it anyways...but i felt it right up there...gonna unbolt the system tomm and weld it back up
so what was the problem??? exhaust leak?