Diesel question

JimS · Nov 19, 2020

I have a 2000 Dodge Ram diesel. It runs slow, though it usually gets up to speed. It is slower cold than warm. That is to say, the vehicle accelerates very slowly. Prior to getting the truck from a friend, he had the fuel pump replaced. He was told that it needed injectors. One thing that concerns me is if I park on a hill/rise, shut it off, leave it in gear with the brake off, it will slowly roll down hill, kinda lugging like motors do when you are trying to bump start. Because I get that bumping motion, I do not think it is the clutch. If I have the brake on or brace it against something and let the clutch out it will stall, as it should. It is not burning oil though it leaks pretty good. Normally, I would think it was blowing by the rings but I am curious if the injectors need replacing, as suggested, can it be blowing by the injectors? When I downshift, I get slightly less than the normal amount of resistance but there is significant resistance. Thanks for your thoughts.

Dieseltech · Nov 19, 2020

Try turning the ignition key on-off three times, leaving it on after third on. If there are any trouble codes they will display at the odometer, example, P1234. Might be more than one also. Could be your VP44 electronic injection pump is dying..

mmfan55 · Nov 19, 2020

Fuel pump may be improperly timed. Slow timing on a diesel yields the same result as a gas engine. Not staying put in gear hints of low compression

Janicholson · Nov 19, 2020

The rolling down hill in gear sounds normal because the drive line is turning the engine. As the compression slowly escapes past the rings, the engine turns one stroke of compression stopping it for a bit. It is not a radical compression issue because the engine runs. If it were worn, the oil consumption would be bad, and the starting might not happen.
The power issue is either not enough air (restricted filter or air tubing is possible) and it will amoke pretty strongly black. Lack of fuel is more likely. Plugged filters, poor fuel pressure to the pump, bad pump, pump control linkage out of adjustment, or wrong. All these will have a clean exhaust, but no power. Jim

pcsaw · Nov 19, 2020

I would check the valve adjustment

steve-in-ga · Nov 19, 2020

I have an 02 dodge diesel and have replaced the vp44 twice in 400,000 miles. Fuel from the lift pump is what keeps it lubricated and cooled. When the lift pump gets week it starves the vp44 and it overheats and causes issues. Both times I replaced mine it had dead pedal symptoms. Couldn't get it to accelerate as it should. Google vp44 and dead pedal. Many good YouTube videos on how to replace the vp44 if that turnes out to be the issue.

Diesel question

JimS

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Dieseltech

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mmfan55

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Janicholson

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pcsaw

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steve-in-ga

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