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Runs poorly

Tiny
1FORDMAN
  • MEMBER
  • 2008 FORD F-250
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 127,500 MILES
Missing at idle and driving speed. Set no codes.
Tuesday, November 7th, 2017 AT 4:59 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
If there are no codes, then it is not ignition related. Check to make sure the fuel injectors are working/getting power. Also, you may want to disconnect one coil pack at a time to see which one does not make a difference. That way you will know which cylinder is causing the problem. Once that is determined, then check the injector/compression in that cylinder.
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Tuesday, November 7th, 2017 AT 6:58 PM
Tiny
1FORDMAN
  • MEMBER
  • 2 POSTS
I have disconnect coils does not make difference. Ran compression, the missing is less than five seconds.
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Wednesday, November 8th, 2017 AT 6:45 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
So does the engine have good compression in all cyclins? Here is a guide to help you get the job done.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run this test and get back to us.

Cheers, Ken

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Friday, November 10th, 2017 AT 10:51 AM

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