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OBD2 scanner shows check engine light it is coming up as a multiple misfire

Tiny
CARLIFE4419
  • MEMBER
  • 2001 MITSUBISHI ECLIPSE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 350,000 MILES
Ran an obd2 scanner for my check engine light it is coming up as a multiple misfire, but I replaced spark plugs and everything and when it’s runs it seems like my car is trying to shut off, and it bog really bad. Also, when driving the RPMs won’t run. How it’s supposed to be?
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Tuesday, December 14th, 2021 AT 12:22 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

What else did you replace besides the plugs? The wires and coils are also a possibility.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

I would also check the compression to be sure the engine is good internally. You should have 140-160. You can rent a tester to check this at a parts store.

https://www.2carpros.com/articles/how-to-test-engine-compression

Also, check the fuel pressure to be sure there is sufficient fuel to the injectors for running the motor correctly.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Tuesday, December 14th, 2021 AT 4:39 AM

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