Misfire

30

Asked by Feb 14, 2016 at 07:28 PM about the 1999 Chevrolet S-10 3 Dr LS Wide Stance 4WD Extended Cab SB

Question type: Maintenance & Repair

I have a 1999 s10 4.3l vortec, it misses in
cylinder 4, I have replaced the spark plug,
and plug wire, but it continues to misfire, I
am thinking I have a problem with the
distributor cap or the whole distributor, I
don't have the catalytic converter because
it rusted off ( typical GM product) could it
be because it isn't reading co2

2 Answers

74,725

Yes needs the cats on there. ECU can't adjust the air fuel mixture to were it needs to be. Its probably running rich.

2 of 2 people found this helpful.
Best Answer Mark helpful
30

I believe it's running rich in hoping its the cats and not a valve going bad because if it is I'm going to do a Cummins 4bt swap lol

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