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Discussion Starter #1
The last couple mouths I've been noticing every time I drive my XJ to work or trail riding, the eng. will miss and it will only do it once and that will be it. It doesn't matter how fast or how far you drive it, it will do it once.

Would like to see if this has happened to someone else or someone might know wear to look.

Thanks
 

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Discussion Starter #3
It is a 89 and it isn't showing any codes. I changed the plugs, cap, rotor and fuel filter around march this year.
 

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It is a 89 and it isn't showing any codes. I changed the plugs, cap, rotor and fuel filter around march this year.
89's wont have any codes, it is pre OBDII era. Are you sure all wires are making solid contact with plugs,cap?
 

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If you bought the dis.cap with the aluminum electrodes change it out for one with the copper ones
 

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Aww the renix era cherokee. I have a 89 as well and it has been nothing but problems. I can honestly say I regret buying it. Years ago I had an 85 and not a single problem with it.
 

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Discussion Starter #7
I checked all the wires and plugs and every thing looks good. I took the dis. cap off and cleaned it up and it missed once going to work and once coming home.
What is the difference between the aluminum dis.cap and a copper as far as performance goes
 

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For what it is worth...check your crankshaft position sensor...sometimes the wiring harness will bump the exhaust down pipe or manifold, causing an intermittant miss. Just my .02
 

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I checked all the wires and plugs and every thing looks good. I took the dis. cap off and cleaned it up and it missed once going to work and once coming home.
What is the difference between the aluminum dis.cap and a copper as far as performance goes
The copper give a better connection.I had this to happen to me and had to change to the copper connectors.
 

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My 89 did it too, just acted like it would shut off than pick right back up. Crank sensor went out soon after. I finally got it home by jiggling the wires, after I changed it he hasn';t done it sense.
 

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Discussion Starter #13
I checked the cps sensor and the ohm's test came out good on it but when I did the test where you check the senor while starting it, the instructions said anything under .5 the senor is bad and it was showing .3 to .4 .
 

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Discussion Starter #14
Changed the cps and it still does it. The only time I really notice it is when I'm at a steady speed on the highway. It seems to do it the most when going up an incline.
 
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