2000 Ford Ranger Low RPM

[monstermazda]

Ok with 235/75r15 with 3.73 at 2000 rmps should be traveling a 45 mph

Here's a list at 2000 rpm in 4th
235/75r15 with 3.55 = 48mph
235/75r15 with 3.08 = 55mph
235/75r15 with 4.11 = 42mph

Your clutch could be slipping.
All of them number are on stock tire sizes and round about on gear ratios


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[dhess184@gmail.com]

Ok with 235/75r15 with 3.73 at 2000 rmps should be traveling a 45 mph

Here's a list at 2000 rpm in 4th
235/75r15 with 3.55 = 48mph
235/75r15 with 3.08 = 55mph
235/75r15 with 4.11 = 42mph

Your clutch could be slipping.
All of them number are on stock tire sizes and round about on gear ratios


Sent from my SAMSUNG-SM-G870A using Tapatalk

Tire size is 220/75r15. Thinking that might be a little narrow????

 

[monstermazda]

Yeah be close to the same size as a 235/75r15 that all that stands for is 235 mm wide and 75% of the width but the speed should be close the the same maybe .5 mph off.


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[dhess184@gmail.com]

Yeah be close to the same size as a 235/75r15 that all that stands for is 235 mm wide and 75% of the width but the speed should be close the the same maybe .5 mph off.


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Something else I just remembered too. At 40-45 mph accelerator is on the floor. ?????? rather odd. But not sure yet as of cause.

 

[Kealel]

Something else I just remembered too. At 40-45 mph accelerator is on the floor. ?????? rather odd. But not sure yet as of cause.

With the truck off, put your hand behind the gas pedal and pull it forward? Is there slack? I am guessing you have a lot... Follow the pedal up until you find the throttle cable and if there is slack, remove it with zip ties.

Sent from my Ranger's driver's seat.

 

[tomw]

Two things can cause you to have limited power. Dragging brakes, especially the front calipers, and lack of fuel. Ok, there is a third, a blocked exhaust system, either muffler, tailpipe or catalytic converter.
Dragging brakes would smell HOT if you drove, traveled 45mph WOT, and then pulled over to the side of the road. You would also be able to feel the heat radiating from the wheel(s) that have the sticky caliper.
Blocked by filter or pump, low fuel flow would just let the engine run slower and slower as it ran out of fuel. The engine would self-limit in that if you went faster, there'd be more air, not enough fuel, and it would start to misfire due to lean mix. Check pressure and flow volume with the engine running, pull the vacuum line from the regulator to see the pressure 'bump' simulating open throttle and lower vacuum. Measure flow by capturing the fuel in a container, check the volume and do math to determine gpm.
Blocked exhaust would be temporarily helped by removing the upstream O2 sensor(loud and HOT GAS THAT CAN DAMAGE STUFF) as a test, seeing if power returned(travel above 45mph).
tom