injector pulse issue
Thread Starter
Joined: Jun 2005
Posts: 4,641
Likes: 392
From: cookeville, TN
injector pulse issue Having a tuning issue with the car running rich, its fried its passenger precat 02 which has since been replaced. Monitering the output of the o2's with a scantool still indicates the issue is present.
What would cause an ecm to double the injector pulse of bank2 compared to bank1?
What would cause an ecm to double the injector pulse of bank2 compared to bank1?
Thread Starter
Joined: Jun 2005
Posts: 4,641
Likes: 392
From: cookeville, TN
I don't have tuning software a friend came by to check out a wierd throttle response issue and this is what was discovered. So I was curious if anyone had any experience with it.
I don't think it has an exhaust leak
I don't think it has an exhaust leak
On The Tree
Joined: Sep 2007
Posts: 196
Likes: 0
Check for vacuum leaks or check for exhaust leaks as stated above. These are the common issues for have the PCM/ECM add more fuel on one bank. Check your spark plugs as well but I'm sure they wouldn't be causing this issue.
Thread Starter
Joined: Jun 2005
Posts: 4,641
Likes: 392
From: cookeville, TN
Valve covers just have breathers no pcv system. So the only vacuum leaks would be on the intake manifold.....unless the valve cover itself is loose enough to leak?
Plugs were swapped out last month, I don't think I have an exhaust leak but I'll look into it. My long tubes still have pcv and egr provisions so I may need to check them out
Plugs were swapped out last month, I don't think I have an exhaust leak but I'll look into it. My long tubes still have pcv and egr provisions so I may need to check them out
Thread Starter
Joined: Jun 2005
Posts: 4,641
Likes: 392
From: cookeville, TN
got it into closed loop last night (still wont idle correctly) and the bank 2 sensor 1 o2 isnt switching as much as the bank 1. the rears are turned off. Bank to seems to stuck around .250 and .300 on the new o2 i just put in. So im wondering if a wire hasnt got to close to the headers on the O2 harness. Ill be inspecting that soon maybe that will shed some light on my issue.
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Thread Starter
Joined: Jun 2005
Posts: 4,641
Likes: 392
From: cookeville, TN
Software is in did a quick idle log, still high pulse on bank 2. 3.2 bank 1 and 5.4 on bank 2. I do t think it ran long enough to get to closed loop , though o2 for bank 1 switched and a stepped square wave while bank 2's o2 was flat. I just installed this o2 so I don't don't think.its dead. I swapped bank1 and 2 and the bank2 side was still flat even with the sensors swapped. Seems this is less about the tune and more about a signal loss between that banks harness and the ecm.
I'm gonna disconnect more of the harness to see if I can find a snagged area or something else. I don't think I have an exhaust or vaccum leak. So I'm gonna keep digging at the electrical side.
I'm gonna disconnect more of the harness to see if I can find a snagged area or something else. I don't think I have an exhaust or vaccum leak. So I'm gonna keep digging at the electrical side.
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