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Random misfires

Tiny
MASHCRAFT1969
  • MEMBER
  • 2006 JEEP LIBERTY
  • 3.7L
  • V6
  • 4WD
  • AUTOMATIC
  • 219,000 MILES
New plugs, coils, injectors, cam sensor, crank sensor, TPS, ASD, transmission, ECU. Still random misfires!
Monday, July 29th, 2019 AT 2:18 PM

3 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

Can you please check for any vacuum leaks, especially around the intake manifold. A vacuum leak is notorious fire causing misfires, random misfires, and a whole list of other driveability concerns. Here is a link for you to go to below:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please go through the guide and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Monday, July 29th, 2019 AT 10:48 PM
Tiny
MASHCRAFT1969
  • MEMBER
  • 2 POSTS
I will check Friday afternoon and get back to you. Thank you.
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Wednesday, July 31st, 2019 AT 11:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,186 POSTS
If I can jump in here, I have seen the MAP sensor do this I would remove it and see if it holds vacuum here is the location. Check out the diagrams (Below). Please let us know what you find.
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Friday, August 2nd, 2019 AT 3:59 PM

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