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1997 Ford Crown Victoria Runs Rough On Hot Arizona Days

Tiny
MARKMANN
  • MEMBER
  • 1997 FORD CROWN VICTORIA
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Hello! On very hot days when I am running the AC my engine will run rough, as if a cylinder is not firing. It will continue to run, not stall, with a steady check engine light. After a while it will start to run good again (especially if I get it up to highway speed for a while). I re-set the check engine light and all is well to it happens again. (Temperature meter reads OK, mid-range) I suspect it is a coil-pac or maybe a relay. I have cleaned out some rust under the coil packs and have swapped the relays around. I am still testing. Wires and plugs are good (new). What do you suggest? I am thinking New Coil Packs, Relays and Diode. ?
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Thursday, March 19th, 2009 AT 8:20 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,901 POSTS
Hi:
Have you checked for vacuum leaks? Also, if the check engine light was on, have you had the codes read? Most nationally recognized parts stores will do it for free. Finally, a weak coil pack could cause it, but without knowing what code is set, it would be a guess and I'm not one for having people spend money based on guessing. Let me know what code you find and then we will have a better idea which way to go.

Joe
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Thursday, March 19th, 2009 AT 9:06 PM

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