Still have a miss after tune up

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Jan 13, 2012 | 07:56 PM

jmmaly

Thread Starter

Newbie

Joined: Jan 2012

Posts: 10

Likes: 0

Model: Cherokee

Still have a miss after tune up

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

Jan 13, 2012 | 09:31 PM

hawaiian808

Seasoned Member

Joined: Nov 2011

Posts: 357

Likes: 0

From: pa!

Model: Cherokee

What did u include in your tune up

Jan 13, 2012 | 09:52 PM

shooting sticks

Seasoned Member

Joined: Dec 2011

Posts: 319

Likes: 0

From: Wenatchee, WA

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?

Jan 13, 2012 | 10:31 PM

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

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.

Jan 13, 2012 | 10:44 PM

BigzXJ

Member

Joined: Sep 2011

Posts: 248

Likes: 0

From: Oklahoma

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.