Swapped motors, now I get CEL
#1
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Join Date: Jul 2013
Location: Northeast Iowa
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Year: 1999
Model: Grand Cherokee
Engine: 4.0
Swapped motors, now I get CEL
I just swapped motors in my 99 GC, putting in a 4.0 from a 2000 GC. I get a Check Engine Light that's solid until everything is warmed up, then as soon as I come to an idling stop the CEL begins to flash. I've swapped out the ignition coil, checked the gap on all of the new spark plugs, replaced the gas cap, even Seafoamed it. I still get the CEL. It seems to run fine when underway but the idle is a little rough. Any ideas?
#6
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Year: 1998
Model: Grand Cherokee
Engine: 4.0
A flashing check engine light usually means unburned fuel is getting into the catalytic converter and burning there which will kill the cat in a matter of no time. Once you smell rotten eggs it too late.
Last edited by JJCIII; 07-31-2013 at 12:19 AM.
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