z06psi
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11,000 miles on the NGK with the same tune. No issues.
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Stage 2 Whipple P0300 random misfire
- Thread starter FIVE_LITER
- Start date
- Watchers 13
OP
OP
FIVE_LITER
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- Thread starter
- #33
Definitely not denying that. I did think it was weird how it was fine for the first few hundred miles though before it started missing.
Car runs good now a couple thousand miles later though so I could care less how it happened
CTH621
Well-Known Member
I'm getting the p0300 too during high RPM runs. The CEL flashes but i don't feel a loss of power. With that cracked plug, did you feel power loss? Or there were no drivability symptoms at all?Definitely not denying that. I did think it was weird how it was fine for the first few hundred miles though before it started missing.
Car runs good now a couple thousand miles later though so I could care less how it happened
Dennisn
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I'm fighting this issue as well. Dyno shows substantial power loss when this happens. (Already tried crank relearn). Checked plugs already too.
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OP
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FIVE_LITER
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- Thread starter
- #36
I didn't feel anything at first just had the cel coming on. It got much worse and it was definitely losing power and cutting out making it a really jerky ride. It got so bad I quit driving it until the new plugs came in.
Nerass
Well-Known Member
OP was it always a random cylinder misfire and replacing all resolved the issue? or was there something deeper? fighting a similar issue but non-fi. been fighting it since my cj install.
cdq85
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I believe I'm going through the same thing now. Last week I got the CEL for random misfire and I cleared the code and it didn't come back until yesterday . I just took my car on a little road trip and it flashed for about 30 seconds and then went away. Were you clearing the codes after they came on or were they going away on their own?
Burkey
Well-Known Member
I know of a guy who had the random misfire code. Turned out to be failed cats.
No idea how that works sorry.
Started out as misfire, eventually showed the cat code later.
No idea how that works sorry.
Started out as misfire, eventually showed the cat code later.
ahl395
Well-Known Member
FWIW misfire codes can also come up from running too rich. Happens if you inject too much methanol with meth injection. Too much fuel in the cylinder to properly combust and it'll "put out" the flame. I had this happen until I dialed back my meth settings and/or had fuel pulled from my tune.
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