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-   -   Cylinder Misfires (http://www.wranglerforum.com/f210/cylinder-misfires-211257.html)

Jwrangler03 01-11-2013 10:26 PM

Cylinder Misfires
 
I recently changed my spark plugs to Autolites APP985. My cylinders are now misfiring, and now i have a check engine light on. Wondering if i tightened to tight or to loose. Open to idears.

The Green Machine 01-11-2013 10:37 PM

To my knowledge, Autolites are for Fords. Champions are for Jeeps. I would swap the Autolites for Champions. That is what I run, and have no problems.

tallzdatank 01-12-2013 08:23 AM

Quote:

Originally Posted by The Green Machine (Post 3217292)
To my knowledge, Autolites are for Fords. Champions are for Jeeps. I would swap the Autolites for Champions. That is what I run, and have no problems.

really? :facepalm: first thing you'll want to do is check to see all your wires as on the right plug, and tight. if yes, check to see that plugs are tight. (snug down) if yes, check the engine code, report back. the plug brand will make no difference as far as causing a misfire. especially when the plugs are new. oh tip, when tightening the plugs be careful not to go to tight as you may crack the porcelain. that could also cause a misfire.

Jwrangler03 01-12-2013 08:54 AM

Yes, engine code found. P0306 which is cylinder #6 is misfiring. Ill check the torque of the screws and spark splugs.

JimsJeep 01-12-2013 09:35 AM

In addition, if the plug wires are on the older side you may have disturbed an issue waiting to happen. You could try swapping a wire to see if the misfire moves.

tallzdatank 01-12-2013 09:50 AM

Quote:

Originally Posted by Jwrangler03 (Post 3218726)
Yes, engine code found. P0306 which is cylinder #6 is misfiring. Ill check the torque of the screws and spark splugs.

check that cylinder 6. I would guess either the wire is loose/bad, or the plug was loose.

Jwrangler03 01-12-2013 10:10 AM

Does the cylinder count start from front to back or back to front.

Jwrangler03 01-12-2013 10:11 AM

*

The Green Machine 01-12-2013 12:34 PM

Quote:

Originally Posted by tallzdatank (Post 3218656)
really? :facepalm: first thing you'll want to do is check to see all your wires as on the right plug, and tight. if yes, check to see that plugs are tight. (snug down) if yes, check the engine code, report back. the plug brand will make no difference as far as causing a misfire. especially when the plugs are new. oh tip, when tightening the plugs be careful not to go to tight as you may crack the porcelain. that could also cause a misfire.

Really:facepalm:, I found that Fords dont run right except on Autolites, and Motorcraft plugs. Like I suggested before, run Champions.

tallzdatank 01-12-2013 12:39 PM

I run the same double platinum plugs that OP is using, and the autolites work fine for my tj, and they were fine in my yj and the copper core autolites run fine in my dj.

The Green Machine 01-12-2013 01:10 PM

Quote:

Originally Posted by tallzdatank (Post 3219375)
I run the same double platinum plugs that OP is using, and the autolites work fine for my tj, and they were fine in my yj and the copper core autolites run fine in my dj.

My owners manual says Champion plugs for my Jeep. I don't have to manipulate this, or that, or run a code scanner to look for codes, to get them to work either. Mine are plug and play. You can use whatever you want to use though. :whistling:

The Green Machine 01-12-2013 01:16 PM

OBD-II Trouble Code: P0306 Cylinder 6 Six Misfire Detected

A code P0306 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
I'd swap to Champions.

Jwrangler03 01-12-2013 04:42 PM

Bah ha found it. One of my spark plugs were not gapped to the right size. Re-gapped runs better than OE Plugs.

ninjaturtle0 01-14-2013 07:18 AM

I had misfire a few weeks ago w autos...

I pulled the spark plug and it was broken so I just replaced it and no problems since.

Zaedock 01-14-2013 07:32 AM

I run Autolite copper cores in all of my Jeeps and Jeep powered rigs. They run fine.

The Green Machine 01-14-2013 07:38 AM

I just love loaded questions. That's why I stay away from auto boards.


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