Why is my engine misfiring ?
10

Asked by USMC83 Jun 13, 2020 at 06:21 PM about the 1994 Chevrolet S-10 Blazer 4 Dr Tahoe 4WD SUV

Question type: Maintenance & Repair

I replaced my engine in 94 S10 Blazer with a
long block 4.3 . It has a miss I can't find. I
have changed the plugs , wires , cap and
rotor , cleaned injectors and ports . Still
misses . I have an exhaust leak at the
bottom side if the manifold don't know if
that has any effect on it

3 Answers
157,855

James answered 4 years ago

The exhaust manifold leak could be upsetting the reading that the oxygen sensor is getting. This will happen because fresh air is getting pulled into the exhaust stream and past the oxygen sensor from the leak at the exhaust manifold. Is your check engine light or service engine soon light on with a lean exhaust trouble code? If so that's why. Hope that helps! Jim

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10

USMC83 answered 4 years ago

I just got a scanner last night . The only code I get is a 12 which of course is no faults . I will fix the exhaust leak and see what that does. Thanks

1 people found this helpful.
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157,855

James answered 4 years ago

You're welcome. Glad to help! Hopefully that does the trick! Jim

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