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Old 02-12-2013, 06:18 PM
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03 5.4 Miss Fire and Questions

Hi all! I have a few questions about my 5.4. First off, itís a worked hard 03 250 4x4 with a plow set up and some bigger springs (sits higher than my 06 350 PSD). Anyway..... I had a miss fire cyl #1. Changed the plug and COP (tried 2 COPs). Got another COP 1 P0351 code. Truck has NO CEL but clearly with codes the light is just out. Even when I just turn on the key, there is NO CEL. So its burnt or someone was clever and removed it. lol

This is where it gets weird..... after it warms up to full temp, the miss goes away. So after like 15/20 minutes its running smooth. The only thing wrong that I can see is a cracked exhaust manifold but that shouldnít make it miss like this. And itís like clockwork when it starts to run right. I would just deal with it but I need it to run right to pass emissions (250 gasser)

Any help would be great! The truck was cheap and 4x4
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Old 02-12-2013, 06:51 PM
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Actually..... So now that I think about it.... The first code I had was cyl#1 miss fire and miss fire at start up. Then I put a new COP I had around and after that got the P0351 code. That coil pack could have been bad since it was off a town car I parted out. So, put a new Accel COP on and still missing until hot. BUT seems to be OK at WOT when RPMs are up. Also, that side exhaust manifold is crack BAD. I wonder if this is that #1 injector sticking a bit until it gets hot? Thoughts?

Also this truck is weird... When the key is on the parking lights are on. Also, when I turn the key off I have to slam the door hard to get the lights to go back out.


Let me know what you think... I would LOVE to get this solved!

Last edited by Galaxie; 02-13-2013 at 06:34 AM.
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Old 02-14-2013, 05:19 PM
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I think I fixed this. I put a new COP on cyl 1, Plug, injector, and did a compression check. NOTHING and still have the code. So with it running I disconnected the COP and it ran like CRAP. Did the same for #2. Ran like crap. Did it on #5 and NOTHING CHANGED. Put a new COP on #5 and the code went away and it runs right.

Wow...
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