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Unread 12-12-2012, 06:07 PM   #1
rjlamber
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1995 XJ Cherokee 
 
Join Date: Dec 2012
Location: Grand Junction, Colorado
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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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Unread 12-12-2012, 06:36 PM   #2
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
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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.
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Unread 12-12-2012, 06:53 PM   #3
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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Unread 12-12-2012, 06:57 PM   #4
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.
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Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 12-12-2012, 06:59 PM   #5
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.
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Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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Unread 12-12-2012, 07:01 PM   #6
cruiser54
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Post up some photos of our cocktail blender, please.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 12-12-2012, 07:10 PM   #7
buildin1XJ
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1999 XJ Cherokee 
 
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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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Unread 12-12-2012, 07:13 PM   #8
cruiser54
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1990 MJ Comanche 
 
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I'm thinking you could pull 2 plug wires and it would shake that martini rather than blend it.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 12-12-2012, 07:17 PM   #9
tjwalker
It's the crank sensor!
 
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1999 XJ Cherokee 
 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,497
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!
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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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Unread 12-12-2012, 07:33 PM   #10
buildin1XJ
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1999 XJ Cherokee 
 
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Location: Knoxville, Tn.
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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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Unread 12-12-2012, 07:55 PM   #11
cruiser54
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1990 MJ Comanche 
 
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Location: Prescott, Arizona
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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?
__________________
Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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idle , misfire , shake , spark plug

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