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Posted by Will (in IL) [98.215.27.52] on Saturday, February 09, 2013 at 19:53:03 :
In Reply to: Will, your prob is NOT heat range. posted by Chris Case [75.36.39.191] on Saturday, February 09, 2013 at 17:10:38 :
I'd now agree, as I'm not a plug expert, and I've now tried the stock Champion RC12LYC Plugs with the same results.
Once it starts missing it keeps getting worse, so much you wonder will you make it home. Might be driving it too hard too soon, but not driving to the A/F gauge.
Don't know the problems, elect, fuel or air. Latest "experts" believe I might have an air leak opening up and causing the problem.
Yes, the A/F gauge )2 sensor is separate from the Jeeps system, it has it's own heated sensor.
The above pix is from pulling the stock plugs today, again with a hot engine and running 2,250 RPM.
Had the fuel pump so I went to replace it, and found the parts store on had (to me multi-fit generic) pump fit like crap, so I'm now waiting on a Bosch pump. So I'm at a stand still until I get a pump back in. I did find some debris in side the strainer, so it might be having problems once it's ran for a while.
Thanks for the ideas and help,
Will