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post #1 of 4 (permalink) Old 07-10-09, 08:29 AM Thread Starter
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Cylinder one misfire

I have a 2003 E150 6 Cyl gas van.

I have a cylinder misfire code showing, I changed all the wires and plugs, I also changed the injector in cylinder one, but I still have the service engine light on, and still get the same code P0301.
Any ideas on how to fix this.

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post #2 of 4 (permalink) Old 07-10-09, 11:47 AM
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Re: Cylinder one misfire

Since you have done all that you may as well try a coil pack on it. The coils will break down over time and cause a misfire.

FYI- If it misses at idle and smoothes out whe you crack the throttle, there is most likely carbon built up on the intake valve for that cylinder. This can be verified with a compression test. This would require the heads to be removed to remove the valves and clean them.

Good luck!

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post #3 of 4 (permalink) Old 07-11-09, 12:19 PM Thread Starter
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Re: Cylinder one misfire

Quote:
Originally Posted by fixitnowlt View Post
Since you have done all that you may as well try a coil pack on it. The coils will break down over time and cause a misfire.

FYI- If it misses at idle and smoothes out whe you crack the throttle, there is most likely carbon built up on the intake valve for that cylinder. This can be verified with a compression test. This would require the heads to be removed to remove the valves and clean them.

Good luck!
The diagnostic test says this happens at the first 100 rpm's ?.
There is a single coil pack on the van, can a single coil pack going bad effect only one cylinder.
Could it be a bad crank position sensor?
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post #4 of 4 (permalink) Old 07-11-09, 12:35 PM
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Re: Cylinder one misfire

Yes. The "brick" coil packs can go bad and affect only one cylinder. You may want to swap one ignition component at a time. i.e. plug for plug, wire for wire. It is possible that the ones you put on were bad, especially if they were not Motorcraft parts.

Check for vacuum leaks. A compression test may be necessary for peace of mind.

I have never seen a crank sensor cause a misfire (not to say it will not). They will usually cause a no start condition.

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