Im having problems with my 04 F150 5.4 trk had a slight miss an sometimes threw a code missing on cylinder 3 I replaced the plugs ohm the coil packs everything went came out good drove it down the road had another miss pulled it up on my obd2 an the harness was not plugged in on injector cylinder 6 I plugged it back in tried to start it back up an it would not crank the trk started the next day I pulled it in the shop an replaced the module above the spare tire an check all my fuses drove the trk down the road came back turned it off tried to start it back an it wouldn't then I replaced the fuel pressure sensor on the fuel rail an it done the same thing then I replaced the fuel pump an now it doing the same thing not starting up after its warmed up im lost an I don't know what to try next please help


thanks

 

Stop buying parts. First you need to know if its a fuel or ignition problem. Are there any codes? If it will not start after the motor gets warmed up then it is something electronic. it cools down and it starts! Could be a crank sensor, could be a lot of things.

 

Run-on sentences are so obnoxious.

 

I'll have to look into the ignition. I thought it was a fuel issue everyone said it was the module. I don't have any codes. I'm just lost an don't know were to go next with it.

 

^+1, listen to this post.
If that doesn't do it then I think your coils.
And lastly it could be injectors leak.

 

You can't get a good test of the coils with just an ohmmeter.

 

glc, I tested coils (only after they were hot) with an ohmmeter and found if they were not inspects! I always test new ones cold before installing them to make sure they are all the same reading. I don't know if you agree with this, but that's what I do and it works for me.

 

An ohmmeter only gives you a quick and dirty go/no-go, the only way to get a good test is with a load tester.

 

Generally speaking, I stop reading them after the first couple lines.