engine misfiring on bank 2- Help
Thread Starter
Racer
Joined: Jul 2004
Posts: 316
Likes: 0
From: canton sd
engine misfiring on bank 2- Help
FIXED IT-- i had a pluged cat on that bank, i cleaned it out and it runs great
anyone have any ideas while the right bank of fuel would run in the negative percents and the left bank would not. i also do not know how it could since there is not really anything to alow differnt fuel amount to be supplied to each bank? pulse width on both bank of injestors seems to be the same or at least very close.
anyone have any ideas while the right bank of fuel would run in the negative percents and the left bank would not. i also do not know how it could since there is not really anything to alow differnt fuel amount to be supplied to each bank? pulse width on both bank of injestors seems to be the same or at least very close.
Last edited by natedog4g; Feb 17, 2007 at 05:10 PM. Reason: info
Intermediate
Joined: Jan 2007
Posts: 28
Likes: 0
From: MO
How much negative are the trims running? Is it the long term or short term? Is it enough to set a rich code for bank 2? It is not uncommon for trims to run to around -10% but they should eventually come back close to zero. It will not set a code till around -25% or so. Short term trim give you and Idea a what is going on at that exact moment and long term tells what has happend several minutes ago and changes slowly. It is possible for one bank to get more fuel than the other. The O2 tells the pcm if that bank is lean or rich and the pcm tries to compensate by richening or leaning one bank via that bank of injectors by lengthening the pulse width, not fuel flow. Since the right bank is negative that means the O2 is seeing more fuel in that bank for whatever reason therfore taking fuel away from that bank. Could be leaking injector, fouled plug, bad wire, bad O2 sensor, or internal engine problem sucking oil into cylinder. Now are you completely confused
?
Hopefully this will help you uderstand what is going on and allow you to fix the problem.
?Hopefully this will help you uderstand what is going on and allow you to fix the problem.
Instructor
Joined: Dec 2006
Posts: 226
Likes: 0
From: Newburgh NY
I would suggest finding a local Corvette shop (or other hopefully trusty GM shop) with a Tech II scanner or a tuner with a scanner/logger. These tools can check the O2 sensor outputs, the injectors, and other sensors and data to try to narrow down the cause.
As mentioned, some differences can be common, but it depends on variations. Something to capture the data is the ticket.
In the meantime, you can check the plug wires and plugs yourself to see if somethign doesn't look right.
As mentioned, some differences can be common, but it depends on variations. Something to capture the data is the ticket.
In the meantime, you can check the plug wires and plugs yourself to see if somethign doesn't look right.
Thread Starter
Racer
Joined: Jul 2004
Posts: 316
Likes: 0
From: canton sd
i have checked the springs, fuel injectors, coils, o2 sensors, pretty much all vacuum lines, as many electrical connections i can and the compression (all good) and swapping parts from side to side results in no changes. cylinders 6and4 miss pretty much all the time and 2and8 sparatically. is it possible to have a bad cam sensor or PCM? i have a tech 2 and the o2 sensor is working but only ranges from about 275 to 700, i did swap them from bank 1 to 2 with no results. i am a patient guy and thank god for the 5 inches of snow we just got so i cant drive it anyway but it would be nice so i can start it and just listed to the freakin awesome sound of the engine(when it runs good)haha.
any ideas are welcome, i do have this posted in the Z06 section as well but fugured i would broaden my chances.
thanks
any ideas are welcome, i do have this posted in the Z06 section as well but fugured i would broaden my chances.
thanks
Intermediate
Joined: Jan 2007
Posts: 28
Likes: 0
From: MO
After the car goes into closed loop, spray brake clean around intake manifold to check for air being sucked into intake. I really doubt you will see anything since your trims are going negative. But it wont hurt to try. If there is a leak I would expect trims to go to +5 % or higher.
Intermediate
Joined: Jan 2007
Posts: 28
Likes: 0
From: MO
The above response is slightly wrong I meant to say if you have an intake leak and spray brake clean on intake the trims will go neg not pos.
One other check you can try is check if the cat converter is slightly clogged. Screw a pressure gauge into front o2 sensor is should not go much higher than 1 psi while revving in the stall.
One other check you can try is check if the cat converter is slightly clogged. Screw a pressure gauge into front o2 sensor is should not go much higher than 1 psi while revving in the stall.
Thread Starter
Racer
Joined: Jul 2004
Posts: 316
Likes: 0
From: canton sd
does anyone know what the colors of the wires that connect to the coil banks are. like which one is a ground, signal, ect. ive checked everything i can think of and still nothing. i assume it is passing fuel through the system since its in negative trim on the right bank but yet the plugs are dry on 4 and 6 when i pull them. and switching coils from cylinder to cylinder does nothing. thanks
