RUNS GREAT UNTIL POWER LOSS AT 3000 RPM. WHAT PROBLEM COULD CAUSE THIS SYMPTOM WITHOUT THROWING CODES??

2007 Lincoln Navigator

Tiny

twgreenwood

February, 19, 2012 AT 4:09 AM

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.

FOUND 16219 RELATED QUESTIONS

3 Answers

Tiny

rivermikerat

February, 19, 2012 AT 4:25 AM

Have you had it scanned for soft codes, which won't cause the CEL to illuminate. Check the catalytic converter, it may be plugged.

Tiny

Tanui

May, 1, 2012 AT 8:35 PM

I got the same problem with a 2005 navigator. I ve replaced catalytic converters but there was no change. Please help

Tiny

djcl

May, 1, 2012 AT 11:27 PM

Check your fuel psi @ idle and driving it should maintain 65 to 71 psi

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