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2001 Ford F-150 ignition coil malfunction

Tiny
MR.ELDRIDGE
  • MEMBER
  • 2001 FORD F-150
Engine Performance problem
2001 Ford F150 V8 Four Wheel Drive Automatic

my truck the code 0351 ignition coil a primary/secondary circuit malfunction. Was wondering what would be causing, i've changed the coil pack.
Monday, July 19th, 2010 AT 1:10 PM

15 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,173 POSTS
Have you checked for bad ignition wires, boots. What size V8 is it?
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Tuesday, July 20th, 2010 AT 12:32 AM
Tiny
MR.ELDRIDGE
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It's the 5.4L. It's got the c.O.P. I changed the whole set up on cylinder 1 and I reset the code, drove it and it comes back on.
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Tuesday, July 20th, 2010 AT 10:53 AM
Tiny
JACOBANDNICKOLAS
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If you replaced everything, there has to be a wiring problem to that coil. Can you feel a miss?
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Tuesday, July 20th, 2010 AT 10:49 PM
Tiny
MR.ELDRIDGE
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The miss is very noticalbe. Going to look at the connector. Just bought it for 1000 dollars and this is the only thing I can find wrong with it.
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Tuesday, July 20th, 2010 AT 11:32 PM
Tiny
JACOBANDNICKOLAS
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Check that and let me know what you find. Also, make sure (double check) the boot on the plug isn't bad and arcing in the valve cover. That is a common problem.
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Wednesday, July 21st, 2010 AT 12:06 AM
Tiny
MR.ELDRIDGE
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Okay i've checked all that. Switched coils with number 2 cylinder to double check, still same code. Going to test it with a test light befor I tear into the wire protectors.
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Wednesday, July 21st, 2010 AT 4:41 PM
Tiny
JACOBANDNICKOLAS
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Let me know what you find.
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Wednesday, July 21st, 2010 AT 11:19 PM
Tiny
MR.ELDRIDGE
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Tested it with test light everything is the same as on a different cylinder.
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Thursday, July 22nd, 2010 AT 9:29 AM
Tiny
JACOBANDNICKOLAS
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I hate to say it, but it's time to start checking for wiring issues.
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Thursday, July 22nd, 2010 AT 10:49 PM
Tiny
MR.ELDRIDGE
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  • 27 POSTS
Still no go. Changed connector, was cracked. Still showing the same code.
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Thursday, July 29th, 2010 AT 6:37 PM
Tiny
JACOBANDNICKOLAS
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If it is the same cylender, have you checked compression? Also, have you checked the injector to make sure it is getting power?
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Friday, July 30th, 2010 AT 12:40 AM
Tiny
MR.ELDRIDGE
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Has good compression, haven't checked the injector. But I disconnected the battery and reset the computer it's no longer got a noticable miss, but it still sets the code. Will check the injector asap.
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Sunday, August 22nd, 2010 AT 1:07 AM
Tiny
MR.ELDRIDGE
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Checked the injector has power, switched with a different cylinder to see if it would move the problem but it didn't. But it doesn't miss when it's ideling no more. But when you go down the road untell you reach 35 or 40 mph you can still feel the miss but after that it's no longer their.
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Monday, August 23rd, 2010 AT 6:00 PM
Tiny
MR.ELDRIDGE
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Found the problem thanks for the help. It was a wiring issue. The wire for the coil packs was sliced open, at the pcm connector and it wasnt in the connector properly. Thanks for the help.
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+1
Monday, November 22nd, 2010 AT 2:27 PM
Tiny
JACOBANDNICKOLAS
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That will do it. Glad you found it. I had a feeling it was a wiring issue, but finding them is hard to do sometimes. Let us know if you have questions in the future.

Joe
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Monday, November 22nd, 2010 AT 7:38 PM

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