Quote:
Originally Posted by Redd
This was a couple years back. If remember correctly, I had just installed a new Carboproject plenum (my 2nd one). Carboproject re-uses stock bottom half of the plenum and this particular one I got had a small air leak at the IAT sensor hole. It was this air leak that caused the misfires under high vacuum conditions (2-3k rpm, part throttle).
It didn't occur to me at first that the plenum was the problem as I had also installed new injectors at the same time and my 1st Carboproject plenum ran perfectly for several years. In the end, we found the problem by removing the plenum and letting the engine run in alpha-n mode which eliminated the misfires. So we knew the problem was in the plenum.
Sealing up the air leak and new O2 sensors (the misfires damaged the O2s) fixed the problem.
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Ok, interesting. I’m using stock plenum so I’m assuming I left something loose and will start there. I immediately thought my new injectors were my trouble but will check out the plenum first. The car had only misfired for 30-40 seconds before I killed it so hopefully o2s will survive. Thanks for your reply all these years later, I appreciate the help sir