my 2001 ranger 4x4 extended cab wont rev up pass 3000rpm, why

Asked by Sep 24, 2015 at 03:55 PM about the Ford Ranger

Question type: Maintenance & Repair

4.0L engine V6

4 Answers

30,055

there are several things that might cause that...i would start with a new fuel filter first.....

1 people found this helpful.
119,645

Like kelly says change the fuel filter, then Clean your throttle body with a cleaner such as CRC...

1 people found this helpful.
Best Answer Mark helpful
64,165

If the fuel filter doesn't fix it it is likely a plugged catalytic converter(s). You could temporarily unscrew the front O2 sensors and see if the maximum RPM increases or drop the header pipes from the exhaust manifolds to see if that pins down the problem for you. Also a vacuum gauge can easily diagnose plugged cats.

1 people found this helpful.
64,165

Watch this video for vacuum testing....https://www.youtube.com/watch?v=d-jp1IIJVVk

1 people found this helpful.

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