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Back fires through air cleaner.

Tiny
BGAMENV
  • MEMBER
  • 1996 FORD F-350
  • 135,000 MILES
I changed MAP, TPS, coil and pick up in dist. Pulled ecm put into a nother truck that truck ran fine. Pulled y-pipe to check for blockage. Checked fuel psi. Bouth tanks apere to be fine.32 at idle 42 at high idle thin drops back to @ 32. I'm stumped can you help with this?
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Wednesday, September 28th, 2011 AT 8:07 AM

2 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Check timing, backfires through intake are that or a worn Cam. Or burned intake valve.
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Wednesday, September 28th, 2011 AT 8:34 AM
Tiny
BGAMENV
  • MEMBER
  • 2 POSTS
Timing is at 10deg. Did a tuneup about 1000 miles ago. Plugs, wires, cap & roter, air & fuel filter. Was runing fine one day the next started back firing all at once. Can get it to high idle. But whin you put it in gear and try to drive it will start back firing. No power. I'm thinking it's fuel or air
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Wednesday, September 28th, 2011 AT 5:37 PM

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