missfire please help!!
02-04-2009, 09:46 PM
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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?
02-05-2009, 08:54 PM
Join Date: Dec 2001
Location: Louisville,Ky.
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Check the fuses, you have a blown lighter fuse.
02-21-2009, 10:11 PM
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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.
02-27-2009, 02:20 PM
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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.
03-02-2009, 02:20 PM
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I think he's saying he changed the fuse, then could read the code that indicated which COP was bad.
03-11-2009, 02:48 AM
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Yep, when I had a bad coil the scan tool tells ya which one is mis firing.