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

157,615

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

10

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.
157,615

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

Your Answer:

S-10 Blazer

Looking for a Used S-10 Blazer in your area?

CarGurus has thousands of nationwide listings and the tools to find you a great deal.

Postal Code:

CarGurus Experts

  • #1
    Cody Doud
    Reputation
    1,220
  • #2
    Jeremy Roadman
    Reputation
    920
  • #3
    Markfisler
    Reputation
    710
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet S-10
3 listings starting at $12,975
Used Chevrolet Blazer
17 Great Deals out of 865 listings starting at $21,877
Used Chevrolet Tahoe
20 Great Deals out of 904 listings starting at $11,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.