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2004 Monterey - Misfire

07-31-2010, 09:47 AM
I have a Mercury Monterey in the shop that has a random misfire. Tried cleaning the injectors, replacing fuel and air filters, checking fuel quality, plugs and wires (which I may add are a pain in the rear to find). Still misses, gets worse when AC Compressor kicks in, seems to run fine at Hwy speeds. No codes except random misfire. Help? :)

Bill - Eagle Automotive

07-31-2010, 10:49 AM
engine misfire under load, re-check wires and may need to replace plugs also


09-04-2010, 04:26 PM
has this had a new cam sensor put in it recently? I have seen a lot of them put in wrong and cause random miss issues. also had a few under tsb with egr sticking open. also check imrc runner control for binding and miss at low rpm.

12-02-2010, 08:58 PM
Problem solved guys, do appreciate the input. Coil pack was actually hairlined down one side and was not applying enough current intermittently to two cylinders. Thanks!

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