weird missing problem on 04 F150

[no1sirbutler]

Ok guys

My buddy has a 04 F150 and its missing in a weird way. It acts exactly like bad gas but weve drained the tank and have ran premium through it plus its had several tanks ran through since it started. Also changed fuel pump and filter according to Ford garage. ford also told us its a misfire in cylinder 7 and change the COP. He did and it still does it. Ford then said it was the spark plug, then the injector, and then said it was the fuel pump after none of these fixed it. Truck has thrown no CEL and it does it randomly. Even when it does it, you can let off the gas and just ease back into it and runs fine. Do you guys have any ideas what it could be?

Keep im mine it has new COP, injector, spark plugs on cylinger 7, and fuel filter and pump according to Ford garage. So right now we arent trusting the local dealership. Any help would be appreciated.

Mike

 

[WVUAnt]

Intermittent problems are always the worst to diagnose. Possibility of a bad COP?

 

[SVTStrikesBack]

There is a well known problem with injectors on these trucks sticking open and screwing up shortblocks.

 

[TERMIN8TR]

Ok guys

My buddy has a 04 F150 and its missing in a weird way. It acts exactly like bad gas but weve drained the tank and have ran premium through it plus its had several tanks ran through since it started. Also changed fuel pump and filter according to Ford garage. ford also told us its a misfire in cylinder 7 and change the COP. He did and it still does it. Ford then said it was the spark plug, then the injector, and then said it was the fuel pump after none of these fixed it. Truck has thrown no CEL and it does it randomly. Even when it does it, you can let off the gas and just ease back into it and runs fine. Do you guys have any ideas what it could be?

Keep im mine it has new COP, injector, spark plugs on cylinger 7, and fuel filter and pump according to Ford garage. So right now we arent trusting the local dealership. Any help would be appreciated.

Mike

the dealership has the diagnostic tool that will read the cylinders and will show which one is misfiring. with that said, if they told you cylinder #7 i would check the cylinder that is 7th in the firing order. you can go through one by one and unplug each cop and see if it has an effect on the idle. then do the same thing with each injector.
after that start checking the actual connectors to the cop's and the injectors. it's funny that no light is coming up on the dash though.

good luck

 

[brkntrxn]

My first thought was COP as well, but you said they swapped it already. Sounds similar to a bad COP I had on my 98 F150 5.4. Your buddy hasn't washed the engine bay recently, has he? He may have more than one intermittent COP.

 

[khooper]

The first thing to do is to check all wires and connectors. Each connector should be disconnected, cleaned by filing lightly or sanding, and lubed with something like WD-40.Another thing to check for is cracked spark plug wires, which allow the very high voltage spark current to escape and short to the engine. This problem is typically the worst when the engine is wet. You can check for this by running the bike in the dark (don't do this in an enclosed area) and throwing water in the wires.
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[05 Roush]

There is a well known problem with injectors on these trucks sticking open and screwing up shortblocks.

Agreed. Check the exhaust odor and startup condition. Some '04's and many '05's have the injector problem.

 

[ubeatyggo]

Great

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[lookin4more]

I worked on a truck that acted identical with what your describing. Replaced everything under warranty never showed a miss on a power balance but you could feel it intermittently. ford recommended replacing the cyl head and bam miss went away. Just my .02