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Cylinder three miss

Tiny
TABITHA BROWN
  • MEMBER
  • 1999 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
My vehicle listed above (Laredo) started to miss. We changed the spark plugs, still missing. We then replaced the coil pack, still missing, then we replaced the injector in cylinder three, that is the one that is missing. Can anyone help recommend what to try next?
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Sunday, February 18th, 2018 AT 12:51 PM

2 Replies

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

The very first thing you should do is perform a compression test to see if the cylinder is able to produce power.

Roy
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Monday, February 19th, 2018 AT 3:02 AM
Tiny
RENEE L
  • ADMIN
  • 1,257 POSTS
Hello TABITHA BROWN,

Here is a link to an article form this site that features written step by step instructions, pictures and a video explaining how to conduct a compression test:

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

If you need further instructions or have another question please come back to the site, we are here to help.

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
Admin
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Monday, February 19th, 2018 AT 2:20 PM

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