Still have a miss after tune up

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01-13-2012, 07:56 PM

jmmaly

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Model: Cherokee

Still have a miss after tune up

1987 Cherokee 4.0 i6. Still has bad miss after general tune up. Any ideas?

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01-13-2012, 09:31 PM

hawaiian808

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Model: Cherokee

What did u include in your tune up

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01-13-2012, 09:52 PM

shooting sticks

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Year: 1990

Model: Cherokee

Engine: 4.0L Renix

Quote:

Originally Posted by hawaiian808

What did u include in your tune up

Yea what did you change/clean up?

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01-13-2012, 10:31 PM

DFlintstone

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Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

Yea, X3. Other symptoms? Smoke? Missing all the time, all Rpm's? You can un-plug wires at the cap to see which one doesn't make it change. Look over/listen for vac lines/leaks.

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01-13-2012, 10:44 PM

BigzXJ

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Year: 1994

Model: Cherokee

Engine: 4.0

I had a bad miss when I did a tune in my 90 two months ago. I scratched my headed for a month then started unplugging spark plug wires (while it was running) and found that number didn't change the miss. I pulled the brand new spark plug and looked closely at it. The electrode looked like it was pushed back and it was loose. Took it back to the store got a new one and boom!!! Solved the problem. Hope yours is an easy fix too.