Update: Still missing after a plug change (another large image)

Posted by Will (in IL) [98.215.27.52] on Friday, February 08, 2013 at 19:55:36 :

In Reply to: OT: Any Spark Plug guru's Out there? posted by Will (in IL) [98.215.27.52] on Thursday, February 07, 2013 at 16:36:30 :

Still have a miss in the Jeep after going another range colder on the plugs (now 2 cooler than stock in NGK brand).

After installing the NGK BKR7E-11 (Gaped at 0.044”) I took the Jeep out for a spin. A/F Ratio seems even more stable. However is started missing even before it warmed up. Might have just been new plugs, but nope. A few miles down the road I got on it. Missed at high RPM, at 4,000+ RPM, A/F ratio in 10-11.5 range (rich).

Attached is a random plug (#5) I pulled after getting home. Engine was well warmed, and missing, and running at 2,250 RPM when I shut it off and pulled the plug.

Now I wonder where I go next? A/F Ratio at High RPM is Rich (10-11.5 range), and in the normal range (14-15) while driving, so I’m still not convinced the miss is fuel related.

Will

• My Dodge Power Wagons

Follow Ups:

• Re: Update: Still missing after a plug change (another large ima - Hemimech 23:32:36 02/08/2013
  • Coil little wires backwards? nm - Chris Case 17:02:11 02/09/2013
    • Re: Coil little wires backwards? nm - Will (in IL) 17:10:57 02/09/2013
  • Re: Update: Still missing after a plug change (another large ima - Will (in IL) 00:05:14 02/09/2013
    • Re: Update: Still missing after a plug change (another large ima - The Dodge Boys 10:08:51 02/09/2013
      • Re: Update: Still missing after a plug change (another large ima - Will (in IL) 11:27:42 02/09/2013
        • Will, your prob is NOT heat range. - Chris Case 17:10:38 02/09/2013
          • Re: Will, your prob is NOT heat range. (Large Pix) - Will (in IL) 19:53:03 02/09/2013
• Re: Update: Still missing after a plug change (another large ima - Vaughn in CA 20:03:55 02/08/2013

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