Engine misfire - JeepForum.com
 
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post #1 of 11 Old 12-12-2012, 05:07 PM Thread Starter
rjlamber
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1995 XJ Cherokee 
 
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Engine misfire

Hi

I just finished replacing my distributor cap, rotor, ignition wires, and all six spark plugs. After I wrapped everything up, I started the engine and I have a misfire. The engine shakes and the exhaust stutters. I'm confident that all wires are going to the proper nodes (I removed them one at a time, replaced the plug, replaced the wire, on to the next one) and that all of the connections are secure. I called my local jeep dealer and he said it could be a problem with the brand of spark plug I used (autolite platinum). The previous plugs were bosch platinum, and there was no misfire, however it did have a rough idle and tried to stall at stoplights. Any thoughts on the cause of the misfire? Also, I tried addressing the stall issue by cleaning the throttle body and the IAC, it helped some, but not entirely.

Thanks in advance for any advice.

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post #2 of 11 Old 12-12-2012, 05:36 PM
tjwalker
It's the crank sensor!
 
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The big question here is this. Did you have a misfire BEFORE you did the work?

If the answer is no, you must look at "cause and effect" principle, which means that something you installed introduced that misfire.

For a 95, I prefer Champion Copper plugs, but I do not believe that the plugs (if properly gapped to .035, did you verify this on each plug before installing?) would be the cause.

Do you still have your old parts? If you do and if you didn't have a misfire before, I would start with replacing one old part at a time until you find the problem.

Keep us updated! This is not going to be hard to find.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #3 of 11 Old 12-12-2012, 05:53 PM Thread Starter
rjlamber
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The misfire occurred after the work, so I obviously messed something up. I was going to get a plug gapper while I was picking up the plugs but the guy at autozone said I wouldn't have to gap these particular plugs. I'll try putting the old parts back in and see what I come up with.
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post #4 of 11 Old 12-12-2012, 05:57 PM
cruiser54
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Quote:
Originally Posted by rjlamber View Post
The misfire occurred after the work, so I obviously messed something up. I was going to get a plug gapper while I was picking up the plugs but the guy at autozone said I wouldn't have to gap these particular plugs. I'll try putting the old parts back in and see what I come up with.
Never take technicaladvice from an AZ counterperson.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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post #5 of 11 Old 12-12-2012, 05:59 PM
tjwalker
It's the crank sensor!
 
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Quote:
Originally Posted by cruiser54 View Post
Never take technicaladvice from an AZ counterperson.
Please everyone. Verify the gap on every single spark plug you install, whether it is for your XJ, your lawn mower, or for your cocktail blender.

Never trust gap out of the box. I cannot tell you how many plugs I have had to gap out of the box because gap is way off.

Gap your plugs.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #6 of 11 Old 12-12-2012, 06:01 PM
cruiser54
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Post up some photos of our cocktail blender, please.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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post #7 of 11 Old 12-12-2012, 06:10 PM
buildin1XJ
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I'm pretty sure TJ has a 4.0 powered cocktail blender,So misfires can not be tolerated.
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post #8 of 11 Old 12-12-2012, 06:13 PM
cruiser54
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I'm thinking you could pull 2 plug wires and it would shake that martini rather than blend it.

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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post #9 of 11 Old 12-12-2012, 06:17 PM
tjwalker
It's the crank sensor!
 
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Location: Central Minnesota
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Guys.....I actually have a neighbor with a single cylinder blender.

Daiquiri Whacker! Homelite weed whacker engine powers it. It is so cool! Great for happy hour! Check it out....

http://www.gasblender.com/

$308 (overpriced to be sure) and you can be the life of the party. Or strip down your old weed whacker and build your own!

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #10 of 11 Old 12-12-2012, 06:33 PM
buildin1XJ
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Thats AWSOME TJ I have several Shindawia engines I could use to build that.Ibet I would be the life of the party on top of a mountain here in TN.
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post #11 of 11 Old 12-12-2012, 06:55 PM
cruiser54
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Quote:
Originally Posted by buildin1XJ View Post
Thats AWSOME TJ I have several Shindawia engines I could use to build that.Ibet I would be the life of the party on top of a mountain here in TN.
Do you need to shake up moonshine?

If you own a Renix Jeep, you'll want to check this out.

An index to over 30 write-ups can be found in the link below

www.cruiser54.com

My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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