I HAVE A 2003 ford f-150 gives code po-307 how do i fix it?

I HAVE A 2003 ford f-150 gives code po-307 how do i fix it?

This code means you have a misfire in cylinder 7.

You can't fix it until you diagnose it. There are several different things that can cause a misfire. So don't just throw parts at it and hope to get lucky - get a professional diagnosis performed.

The good news is that the most common causes of engine misfire are reasonably affordable repairs - things such as spark plugs, ignition coils, clogged fuel injectors etc.

Speaking from experience, there's a very high chance that in your situation its being caused by a weak spark - from a failing ignition coil. Its a known problem with the Ford Triton Engines. The Triton engines have a separate ignition coil on every cylinder.

I own a 2003 Ford Van with the 5.4L V8 Triton engine and have had 2 ignition coils fail between 100k and 140k miles. The second time around I had my mechanic replace all the coils instead of just waiting for the other 6 to fail. If you intend to keep the truck for a long time, its probably worth having all of them done at once because its a lot cheaper.

There's a misfire in cylinder number 7. Most commonly it's from a bad spark plug. In 15 years I wouldn't be surprised. Put in all new spark plugs, but do them 1 by one so you can't mix them up if you have separate plug wires instead of coils on each plug.

Coil pack on cylinder 7. If it is 4.6 liter, also check the spark plug hole for coolant. Sometimes the intake manifolds go bad on them and they leak coolant slowly in the spark plug tube and short out the coil. If all dry just a simple coil swap and your good to go. Easy job. If coolant present, your on borrowed time and going to need a new intake manifold. Plus the coil and might as well do plugs while your in there. Not a real hard job, just not as simple as swapping coils. Ase certified Ford tech btw

Replace the #7 plug. Check for spark at number 7 cylinder. Check if the #7 injector is firing or getting command to fire with a noid light. Check compression at number 7 cylinder.

Take it to a mechanic

It could be a coil pack or the PCM. Take to a mechanic and he will sort it out. You are only guessing by replacing parts willy nilly.

A trustworthy mechanic will be your best bet.