Quote:
Originally Posted by 16ssFR
Mods: LT2 manifold, Roto Fab CAI, Headers, X pipe , DSX Flex Fuel Sensor, and Tune.
Has new spark plugs and wires. Also tried moving around wires and spark plugs but no luck.
The misfire only happens on E85 and when I pump 93, it goes away. Checked logs on scan tool and only happens on cold start at arounf 1,200 RPM. Seems to be only happening on cylinder 2. Cylinders 4, and 8 have maybe 10 misfires but hundreds on cylinder 2.
During tune logs, Throttle body would open 56% at WOT. Saw in another forum that having a stock 87mm TB may cause the issue. Ordered a 95mm TB but want to get some feedback.
Any help would be really appreciated.
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Did you change the spark plugs and wires after the misfires started happening? Or they started happening after you changed the plugs and wires? If so I would double and triple check the wires are all seated and that you didn't crack a insulator and spark is leaking. Also are they iridium tip? If you even touch the inside of an iridium tip plug with metal it will cause a misfire, that's why they tell you not to try to check or set the gap on them.
It is a random misfire code? or is the check engine light continuously flashing?