View Full Version : 00 S10 l31 p0300 when hot
04-16-2011, 08:46 AM
Hey guys just looking for any ideas you may have. I have a 2000 s10 l31 swap with a 0411 I have about 40 miles on it. I now have a problem with a random misfire code only when the motor gets hot it's completely fine when cold. Any ideas??? Thanks Jon
04-16-2011, 08:47 AM
Modified? Cam, stall converter, anything? The more information the better, and at what conditions does the code set. Is it actually misfiring/running rough/shaking?
04-16-2011, 10:32 AM
Here is some more info the motor is rebuilt I did it mildly modded l31
9.8-1 comp ratio
Mildly ported Rhs heads
Lt4 hot cam
Ported intake manifold
Upgraded injector MPFI
Back 2 o2 are deleted also
Most of the sensor are new I just got another coolant temp to try
The truck is kickass when cold then very consistently missfires when hot
Didn't know if anyone has had a similar problem.
Btw it wasn't like this from the start
It does misfire big time the Ses light flashes
The truck is also a 5 speed
The code sets when the truck reaches 200* on the guage
Thanks for all the help Jon
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