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

2007 LINCOLN NAVIGATOR
137,000 MILES
Avatar
TWGREENWOOD
  • MEMBER
  • 1 POST
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.
Feb 19, 2012 at 4:09 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
RIVERMIKERAT
  • CAR REPAIR CONTRIBUTOR
  • 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.
Feb 19, 2012 at 4:25 AM
Advertisement
Avatar
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
May 1, 2012 at 8:35 PM
Avatar
DJCL
  • CAR REPAIR CONTRIBUTOR
  • 767 POSTS
check your fuel psi @ idle and driving it should maintain 65 to 71 psi
May 1, 2012 at 11:27 PM