Cylinder three miss

1999 JEEP GRAND CHEROKEE
130,000 MILES • 4.0L • 6 CYL • 4WD • AUTOMATIC
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TABITHA BROWN
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  • 1 POST
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?
Feb 18, 2018 at 12:51 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
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
Feb 19, 2018 at 3:02 AM
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RENEE L
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  • 1,260 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
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Feb 19, 2018 at 2:20 PM
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