Ignition problems
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Ignition problems
My 5.4 suddenly started missing on 4 cylinders at once. Codes are P0351, P0352, P0353, & P0357
Coils were tested OK by dealer.
Crankshaft Position Sensor was replaced
PCM was reprogrammed by dealer
Nothing has fixed it yet.
These are the first 4 cylinders in the firing order
Anyone ever seen this or have any ideas for a fix
any help appreciated...
Coils were tested OK by dealer.
Crankshaft Position Sensor was replaced
PCM was reprogrammed by dealer
Nothing has fixed it yet.
These are the first 4 cylinders in the firing order
Anyone ever seen this or have any ideas for a fix
any help appreciated...
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Joined: May 2003
Posts: 9,303
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From: Lyndonville, Vermont
Ignition problems
Dealers are just like anything else....some are good some are ***
Most likely wiring or fuel system wiring or computer.
All of those things that were done by the dealer should not have been touched. when you have an issue with multiples its much easier to diagnois. First there is a plug in light that you plug into to test to see if the injectors are firing. Also there is some kinda testor to test the signsl going to the coils. One of those two should reveal the problem...???? gonna look at my book.
Most likely wiring or fuel system wiring or computer.
All of those things that were done by the dealer should not have been touched. when you have an issue with multiples its much easier to diagnois. First there is a plug in light that you plug into to test to see if the injectors are firing. Also there is some kinda testor to test the signsl going to the coils. One of those two should reveal the problem...???? gonna look at my book.
Last edited by 99f350sd; Aug 3, 2003 at 08:23 PM.
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Ignition problems
cylinders are 1, 2, 3, & 7 with are the first four in firing order 1, 7, 3, 2.
Dealer thinks its a wiring short or problem but wants several hundred dollars to hunt for it. I think a good wiring diagram should show where this 4 are close together or something common to them. I don't have one and I'm not sure I want to spend the $160 for a shop manual when I'm not sure if it would have the detailed wiring diagrams I would need. I fear it is a problem in the wiring harness where it goes through the firewall to the PCM.
Dealer thinks its a wiring short or problem but wants several hundred dollars to hunt for it. I think a good wiring diagram should show where this 4 are close together or something common to them. I don't have one and I'm not sure I want to spend the $160 for a shop manual when I'm not sure if it would have the detailed wiring diagrams I would need. I fear it is a problem in the wiring harness where it goes through the firewall to the PCM.
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Ignition problems
I replaced the Crankshaft position sensor before I took it to the dealer. It was an inexpensive part and guess work.
I think the dealer checked the injectors. Not sure. The OBD codes says malfuctioning primary or secondary coil. Dealer says the coils are not firing or getting trigger signal, they just do not know why. I'm trying to locate a Ford wiring diagram for it to see if the leads are close together where they go through the firewall to the PCM.
1997 Ford F250 XLT Supercab with 5.4
I think the dealer checked the injectors. Not sure. The OBD codes says malfuctioning primary or secondary coil. Dealer says the coils are not firing or getting trigger signal, they just do not know why. I'm trying to locate a Ford wiring diagram for it to see if the leads are close together where they go through the firewall to the PCM.
1997 Ford F250 XLT Supercab with 5.4
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Ignition problems
I looked at my 99 wiring diag for my 5.4 and it looks like the computer.. for my year nothing is common except the 12v check for 12v to the coils and the injectors with a test light to ground key on. there is a union not a connector as far as I can tell. They call it a splice...Thats on a 99 though. I'll see it I can hunt down a diag
Dick
Dick
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