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It started missing. I changed plugs and wires. Didn't help

Tiny
BODEANBEST
  • MEMBER
  • 2001 FORD EXPLORER
I have a 2001 Sport Trac. 82,000 miles and it has a 4.0L V6. It started missing. I changed plugs and wires. Didn't help. When I pulled the plugs they were red indicating it was running too lean. My mechanic pulled the codes. Misfire on cylinder 6, random misfire. He speculated the baro sensor was not right. I had the Ford dealer flash my PCM. It ran great for about 3 days afterward but it is doing the same thing again. I also changed the fuel filter with no change. I am thinking it may be a fuel problem but it could be a firing problem. Any help would be greatly appreciated.
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Wednesday, July 18th, 2007 AT 11:34 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It sounds like you might have issue with the ignition coil pack.
Many times, these random misfires can be due to faulty coil pack. As one coil pack controls all the plugs, when it has internal failure, it can trigger the random misfire.

Here is a helpful guide:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

I have attached diagrams for your reference.

Please let me know if you have any questions.
Thank you.
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Friday, October 15th, 2021 AT 8:03 PM

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