Hi all
I have a 99 2500 Cummins and its a turd. I determined this after driving an Identical truck with no mods and more miles and it actually had power like a cummins should.
How can I tell if my turbo is bad?

do I need to install a boost gauge or is there an easier way.
Could be injectors but the truck runs really smooth, it just doesn't have any go to it. what else could be wrong?

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also I've put 40k on the truck and it just rolled over 200k

 

you should have gauges in it no matter what. Do you have a good lift pump on it? could be a weak vp44 could be injectors could be boost leak.

 

Try a valve adjustment, monitor your fuel pressure because too little of fuel pressure can cause a doggy feeling And low pressure will damage your ip. You can pull the intake elbow off the turbo and check the shaft for play or look for a bad boot. Clogged fuel and/or air filter will dog you too. Wastegate could be stuck open. Bad injectors.

I recommend getting a fuel pressure gauge on the truck and a boost And egt gauge as they can help identify issues. Get a lift pump on there from aftermarket. And start with the little cheap things to start trouble shooting. Valve adjustment is a easy project to handle in a weekend although it shoukdnt take but an hour to do. Fuel pressure is a huge concern on these trucks so id get going there as soon as possible. There are lots of things that can cause a sluggish truck, just have to start trouble shooting.