missfire after 40 mile drive
08-26-2010, 03:24 PM
#1
Staging Lane
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missfire after 40 mile drive Hey all I have a missfire after driving my car for a 40 mile distance, it ran perfectly fine up until the last 2 miles. My stage 2 heads, plugs, and wires are all 1 year old, I have not touched any of the system connections in 3 months. I haven't been home from work yet to limp it to a scan tool yet. I looked at the wires no cracks or loose. I didn't even get on it hard either just easy city driving. The O2s are also a year old but I've had bad O2s before and they only caused the car to run rough in closed loop. Anyway what can cause a car to go from running perfectly normal to a very slight misfire. Will clean MAF when I get home and check plugs after scan. Thanks all
Last edited by Altekameraden; 08-27-2010 at 07:07 AM. Reason: mistake
08-26-2010, 11:21 PM
#2
Hey all I have a missfire after driving my car for a 40 mile distance, it ran perfectly fine up until the last 2 miles. My stage 2 heads, plugs, and wires are all 1 year old, I have not touched any of the system connections in 3 months. I haven't been home from work yet to limp it to a scan tool yet. I looked at the wires no cracks or loose. I didn't even get on it hard either just easy city driving. The O2s are also a year old but I've had bad O2s before and they only caused the car to run rough in open loop. Anyway what can cause a car to go from running perfectly normal to a very slight misfire. Will clean MAF when I get home and check plugs after scan. Thanks all
Def try to get the code read, then go from there. Wire, plug, can of MCCC, etc.
08-27-2010, 09:25 AM
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Ok got her scanned, p0308, p0332, p0443, p1133, p1153. Ok thank God its not a random miss. I think a retune would cancel the last two codes. And I hope the miss is causing the knock code to be thrown.
08-29-2010, 10:42 AM
#5
reset the pcm, tun the key foward and pull the pcm ign and pcm batt fuse and wait 5 mins turn off the key reinsert the fuses. if don correctly it would go through idle relearn. The drive and see if any codes reappear. Note it takes 3 or for key starts to set the mls on some codes.
08-30-2010, 06:04 PM
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Ok got the noid light on the injectors, #8 did not pulse. So now the long search for wire shorts and the like. If there's other suggestions I would appreciate it.