Engine missfire

FORD ESCAPE
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2003 Ford Escape 4WD, 62,000 miles, 3.0L Duratec Engine, 6 cylinder, 4 speed automatic, full package of goods

Engine runs rough at idle, got a dtc code (ignition coil c primary/secondary circuit) it is missfiring on that cyl. all the time, I replaced the spark plugs (Requires taking intake manifold off) checked the coils, there is no problem with any coils, but there is no signal from the wires to the coil. followed the wires back and tested for open circuit, no open circuit, so I think the problem is in the PCM (powertrain control module). Any ideas out there would be appreciated.
Thank you.
Aug 27, 2007 at 11:17 PM
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WRENCH
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[quote:4420d2d6a6="wrench"]2003 Ford Escape 4WD, 62,000 miles, 3.0L Duratec Engine, 6 cylinder, 4 speed automatic, full package of goods

Engine runs rough at idle, got a dtc code (ignition coil c primary/secondary circuit) it is missfiring on that cyl. all the time, I replaced the spark plugs (Requires taking intake manifold off) checked the coils, there is no problem with any coils, but there is no signal from the wires to the coil. followed the wires back and tested for open circuit, no open circuit, so I think the problem is in the PCM (powertrain control module). Any ideas out there would be appreciated.
Thank you.[/quote:4420d2d6a6]

Just so everyone knows the PCM does controll the spark so I have replaced it (the PCM) and checked and cleared the codes, becouse this car has PAT's security I had to take it to ford to have the keys coded to the new PCM (junkyard new anyway) it cost 1 hr labor and takes 10min to do but everything is running good now.
Sep 13, 2007 at 4:26 PM
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