I am working on my friend's 2003 F-150 with a 5.4l engine. It will not start when it is cold (32 or below). The engine turns over, the fuel pump is running, and the plugs are firing. I know other years of F-150 have a fuel pump control module problem, whereas the module will crack and moisture gets in, but this truck does not seem to have one. Any ideas anyone?

 

have you tested the fuel pressure? The pump could be weak from the cold.

 

Right, also, -

No FPM problem for that truck or this gen. It's a 11th gen common problem.

Have you jumped it ?

They need 11.4v to fire.

Also, you can't crank these engines continuously more than 4 seconds. The PCM will shut the fuel rail down.

 

Oh, that's easy. Nothing likes to get started at freezing temps. Brew a big pot of coffee & dump it right on top of the intake.

Joking aside, check @Jbrew 's idea and also get a fuel pressure gauge. The fuel pump may be on, but may not be running full strength. Have you changed the fuel filter? Could be clogged. Also check the crank & cam sensor connections. Metal shrinks when it's cold. A loose connection could cause problems. A little di-electric grease in the connectors helps. Not sure if any of this will help you, but good luck bud.

 

Thank you. I told him we needed to check the fuel pressure. I will check it this weekend.

 

I will check the voltage when I try starting it. Thanks.