2002 Ford Mustang missfiring

2002 FORD MUSTANG
127,000 MILES • 6 CYL • 2WD • AUTOMATIC
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JOECOLON
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day 1-check engine light came on, checked the codes, and it said missfire on 1 and crankshaft position sensor, changed plugs and wires, and the sensor, reset the codes, and the engine was still really rough, and codes popped back up...day 2-unplugged the battery to reset whole system, started car and still ran rough, missfiring and engine shaking hard, and is now backfiring under the hood...however no codes came up, pulled numbers 1 and 4 plugs and 1 is in much worse shape....at a lost for where to go next...coil pack? could i have burned a piston ring? please tell me its not a valve!!
Sep 27, 2010 at 3:05 PM
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WRENCHTECH
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Did you triple check the firing order?
Sep 27, 2010 at 3:17 PM
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JOECOLON
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yes...just tried swapping the firing order to see if between one and four to see if it would missfire on four, but didnt notice any change
Sep 27, 2010 at 3:41 PM
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WRENCHTECH
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Your going to have to do some testing to determine if your problem is spark, fuel or compression. You can use a spark tester to observe for a consistent strong spark and do a complete compression test to eliminate that.
Sep 27, 2010 at 4:35 PM
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