missfire please help!!

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Feb 4, 2009 | 09:46 PM

sljohnson

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missfire please help!!

I have a 2000 f150 4x4 with a 5.4 v8. I replaced the thermostat and now i have a bad miss. Service engine soon light is on and stays on, I tried to read the trouble codes with a Code Reader but the Code REader wouldn't even recognize that it was hooked up to the truck. I checked the Code Reader on a different vehicle and had no problems with it so I know that it's working properly. Without being able to pull any trouble codes I don't know where to be able to start. Has anyone had any similar problems?

Feb 5, 2009 | 08:54 PM

LxMan1

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From: Louisville,Ky.

Check the fuses, you have a blown lighter fuse.

Feb 21, 2009 | 10:11 PM

sljohnson

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thanks for the help lxman1 after fixing the fuse and changing the plugs and one of the coils my truck now runs great.

Feb 27, 2009 | 02:20 PM

tenn250

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Having the same problem. Had these symptoms before and found a cracked coil boot. Not the case now, all boots are fine. How did you determine which coil was bad? Appreciate any help.