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Sputtering, I have replaced the IAC, TPS all six plugs and coils?

Tiny
JOSHUAMO2
  • MEMBER
  • 2005 JEEP LIBERTY
  • 3.7L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 223,000 MILES
I have replaced the IAC, TPS all six plugs and coils, PCV valve o2 sensor and I am still having intermittent start issues and bogging out low power low fuel mileage no vacuum leaks I can’t seem to find the issue all plugs are gapped at vehicles specifications.
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Monday, September 26th, 2022 AT 2:08 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
It sounds like the engine is misfiring, but I can tell for sure if you upload a short video of the engine cranking, and then running. In the meantime, please run the codes.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, with this many miles we should do a compression test which you can rent the gauge from the auto parts store for cheap.

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

Take note of what the spark plugs look like compared to each other. This can be a clue to the problem cylinder.

Please go over these guides and report back.

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Monday, September 26th, 2022 AT 5:01 PM
Tiny
JOSHUAMO2
  • MEMBER
  • 2 POSTS
I ended up finding out #5 was misfiring without a code thrown until I turned on the A/C one of my new coil packs was intermittently failing.
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Monday, September 26th, 2022 AT 5:58 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,904 POSTS
It happens, thanks for getting back to us. Use 2CarPros anytime, we are here to help. Please tell a friend.
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Tuesday, September 27th, 2022 AT 12:31 PM

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