Billy Carrion

Hello, I have a 2003 ford f150 supercrew cab with 131k miles with the 4.6l engine.

I am having some cold start issues. Only in the mornings when I start my car I have a misfire that turns on my check engine light. It'll tremble quiet a bit for like 1-2 minutes then run perfectly fine the rest of the day. I changed the spark plug and Coil pack.

Any idea what direction I should go next?

Jbrew

That engine doesn't use coil packs. You have individual coils which is a COP ignition system, - since it's an 03. They used coil packs at one time, but that was back in 99.

So what did the CEL say or what was the DTC when scanning ? What coil and plug was used..the manufacturer.

Billy Carrion

You're correct I had the wrong terminology. I replaced an individual coil with a motorcraft brand. Any idea what it could be jbrew?

Jbrew

Do you recall the code by chance, that might help a little.

How does it start cold, right away ?

Billy Carrion

Yes, it starts right away. It just trembles for a little bit.

I do not have the code on hand but I'll grab it later tonight. All I remember was cylinder 1 misfire.

Also both the plug and coil where motorcraft

Billy Carrion

The code is p0301 indicates that cylinder 1 had too many misfires within a predetermined period of time.

Auto zone recommended the ignition coil, which I already changed.

Jbrew

Alright, erase the code, see if it comes right back to #1 and to reconfirm. - Or have you done that already ?

I would do that first if you haven't yet. From there swap injectors 1 and 2. Erase again and see what comes up.

Could be a bad injector or the pump may be going out. #1 is the furthest away from the pump.

Billy Carrion

Thanks Jbrew I'm going to go head and swap 1 and 2. I already did the reset after replacing the coil nd plug. I'm hoping it's not the pump, so I'll check the injector


What brand injector should I aim for?