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Runs great until power loss at 3000 RPM. What problem could cause this symptom without throwing codes?

Tiny
TWGREENWOOD
  • MEMBER
  • 2007 LINCOLN NAVIGATOR
  • 137,000 MILES
Truck otherwise runs smooth and strong. Replaced all coils, MAF, and fuel filter. Runs great at idle and lower rpm but hesitates and feels like it is starving for fuel or air once you hit over 3K. It only comes into play when accelerating to merge on freeway or to mash on the pedal to pass another car. I would like it to run properly above 3000 rpms too.
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Sunday, February 19th, 2012 AT 4:09 AM

3 Replies

Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
Have you had it scanned for soft codes, which won't cause the CEL to illuminate. Check the catalytic converter, it may be plugged.
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Sunday, February 19th, 2012 AT 4:25 AM
Tiny
TANUI
  • MEMBER
  • 1 POST
I got the same problem with a 2005 navigator. I ve replaced catalytic converters but there was no change. Please help
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Tuesday, May 1st, 2012 AT 8:35 PM
Tiny
DJCL
  • MECHANIC
  • 767 POSTS
Check your fuel psi @ idle and driving it should maintain 65 to 71 psi
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Tuesday, May 1st, 2012 AT 11:27 PM

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