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5.7 vortec random misfire HELP

I ended up changing putting in delphi ignition control module, delphi distributor, and new plug wires. At first start up it was running great. No misfire, long term fuel trim was doing great matching on both banks. Around 2 to 4 percent when driving then 0 at idle. Then unfortunately after it...
- rickwolhoy
- Post #7
- Mar 8, 2024
- Forum: Engine Performance + Maintenance
5.7 vortec random misfire HELP

From what I can tell, everything looked fine? I am not sure what to look for on a distributor cap as to what makes it look bad. I am thinking one evening this week, I am going to start over and make sure it's pointing towards 1 at tdc on compression stroke and reset the cmp retard. It's just...
- rickwolhoy
- Post #5
- Mar 4, 2024
- Forum: Engine Performance + Maintenance
5.7 vortec random misfire HELP

It's usually cylinders 1,3,4, and 8. And its usually only 1 or 2 misfires, but I do in fact know its missing because the truck shakes a bit and it's running rough. And yes, my code reader does have the ability to show individual cylinders. So last night I took the distributor cap off to inspect...
- rickwolhoy
- Post #3
- Mar 4, 2024
- Forum: Engine Performance + Maintenance
5.7 vortec random misfire HELP

Hey all, I've been grappling with a random misfire for a while now. I have a 2000 chevy tahoe z71 with the 5.7 vortec, currently at 322k miles. About a year ago I had a bad misfire at idle on cylinder 3 and after a leak down test I found that the exhaust valve was leaking way beyond spec. I...
- rickwolhoy
- Thread
- Mar 2, 2024
- #help 5.7 vortec chevy misfire tahoe
- Replies: 6
- Forum: Engine Performance + Maintenance