Random misfires on all cylinders
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
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From: Nebraska
Random misfires on all cylinders Guys,
My new 408 has random misfires on all cylinders...is this common/acceptable? In other words, does GM expect/account for these with their EFi PCMs?...or do I need to investigate this further? What are some common causes for random misfires on both banks?
Stroker2112
408cid iron, forged Eagle crank, rods, & diamond pistons, TSP Tv2 cam, CnC'd LS6 243 heads, roller rockers, Chrome Moly rods, Dual Patriot springs, stock intake/TB
My new 408 has random misfires on all cylinders...is this common/acceptable? In other words, does GM expect/account for these with their EFi PCMs?...or do I need to investigate this further? What are some common causes for random misfires on both banks?
Stroker2112
408cid iron, forged Eagle crank, rods, & diamond pistons, TSP Tv2 cam, CnC'd LS6 243 heads, roller rockers, Chrome Moly rods, Dual Patriot springs, stock intake/TB
Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
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From: Nebraska
..they are stock O2s from my 2000 Silverado Z71....I thinkthis might be a good starting point....did you disable the downstream ones?....I'd prefer to buy just 2 (upstream) if I can.......
Originally Posted by Stroker2112
Guys,
What are some common causes for random misfires on both banks?
What are some common causes for random misfires on both banks?
i.e. you need to edit the misfire tables in the PCM
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Thread Starter
TECH Apprentice
Joined: May 2006
Posts: 308
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From: Nebraska
Yes, it worked right away....drove it for about 30 minutes...then lost 2nd gear. I'm days away from ordering a new FLT tranny. Curious, as the car sits in the drive way, it won't start anymore...turns over but won't start. Would the new 02s have thrown the base tune out of whack?......Any ideas on where to start with this new issue while I wait for the tranny?
Stroker2112
Stroker2112
