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Repetitive popping at idle, codes were P0113, p02004 and P0403

Tiny
SANDRA MARIE GIBSON
  • MEMBER
  • 2004 FORD F-150
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 209,000 MILES
Start truck and hear popping coming from driver's side. Codes were p0113, p02004 and p0403. Replaced coil pack, knock sensor, plugs, IMRC, catalytic converter. Last night it was showing plug on cylinder one had minimal spark all others were good. At a loss here I have spent way too much already and haven't been able to drive my truck in almost 2 months. Help please.
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Wednesday, April 6th, 2022 AT 10:06 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

You need to do a compression test on the engine. It sounds like you will need to remove a valve cover to inspect for a bad rocker or pushrod.

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

https://www.2carpros.com/articles/engine-noises

All the other codes are related to this mechanical issue. Once this is solved, the other codes will go away.

Roy
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Wednesday, April 6th, 2022 AT 11:51 AM

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