No acceleration above 55 mph. - Diesel Truck Forum -
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post #1 of 3 (permalink) Old 12-05-2009, 06:18 PM Thread Starter
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No acceleration above 55 mph.

Hey guys im a 6leaker man but my grandpa owns a 2001 cummins 24 valve. The other day he was driving at approx. 55mph and when he attempted to accelerate nothing happened, as if he never pushed on the accelerator. Im not very familiar with the cummins mill so im turning to you fellas for some insight on the situation. The problem doesnt occur all the time its just a random occurance every once in a while for about the last 3 to 4 months. Other than that everything seems to be fine, no lights have come on, not sure on trouble codes tho, idles and runs fine also.... Any and all insight to this issue will be greatly appreciated.
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post #2 of 3 (permalink) Old 12-05-2009, 07:26 PM
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Originally Posted by lambstroker6.0 View Post
Hey guys im a 6leaker man but my grandpa owns a 2001 cummins 24 valve. The other day he was driving at approx. 55mph and when he attempted to accelerate nothing happened, as if he never pushed on the accelerator. .
There are a couple things to check right off the bat: First off, these trucks have issues with fuel pressure from the stock lift pump. If your grandpas truck still has the stock pump, there is a good chance it is going out and not supplying proper fuel pressure to the injection pump. Under acceleration, as you describe, the pump is expected to push more fuel, and if it simply cannot keep up, well, you get the picture. So for this issue, it would be wise to check the fuel pressure at the VP44 injection pump. The pressure range should be no more than 20 psi at idle, and no less than 10psi under full throttle.

I understand that a pressure gauge hooked up and reading from the pump (i.e. not a permanent gauge) is not exactly going to go on a road when you have the gauge hooked up, have someone rev the motor, bring it up in RPM slowly, and see what the pressure does.

Number two issue: Could be problem with Accelerator Pedal Position Sensor. Or as we commonly refer to it here as the APPS. To do a manual reset on this, disconnect both batteries for no less than 30 minutes. After re connecting them, get in the truck, turn the key to "Run" not "Start" and depress the accelerator VERY slowly. Then Ease up on it VERY slowly as well. This should 'reset' the APPS.

How many miles are on the truck, and has either the lift pump or Inj. pump been replaced before?

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post #3 of 3 (permalink) Old 12-06-2009, 04:15 PM
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sounds like the problem is intermittant so I would look at the apps first.

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