Problem with Cheveolet diesel truck


#1

I am trying to help my brother-in-law with repairing his truck. It is a 2002 or 2003 Chevy truck with a diesel engine. He was going down the road the other day under normal driving conditions when the motor made a racket and then white smoke started coming out of the back like a chimney. The truck will still crank and run (and smoke), and now there is a knocking or tapping noise that is coming from the engine. The engine is running kind of rough, and has the tapping or knocking sound, but it will calm down for 1/2 a second at which time the rough idle and noise stop, but quickly return. There is no engine code showing, so my code reader is useless. I once had a Chevy 350 with a spun main bearing that sounds similar, but the motor didn’t idle rough or smoke. I don’t know enough about diesel engines, so does anyone have any ideas? I was told there was a possibility of a bad injector pump or bad injector itself. Is there any way of testing this yourself, or does it require a shop trip? Thanks in advance for the help.


#2

How many miles on it? Is this a Silverado 2500HD with the 6.6L turbodiesel?


#3

not sure of the mileage, and I do think the rest is correct.


#4

Get a hold of a infra-red thermal gun, and while the engine is running point it at the runners on the exhaust manifolds for each of the cylinders.

If you find a cold runner on the manifold that cylinder isn’t firing.

Tester


#5

the truck is a 2003 2500hd 6.6l turbo duramax with 88000. I have never heard of a infra-red thermal gun, but will try to locate one.


#6

Check your auto parts store. They may have one to loan. You have to give them your credit card # as a deposit, but they will delete the charge when you return the heat gun. Places like Advance Auto and Auto Zone have this service. I’m sure others do too.


#7

you’re looking for something like this.

Make sure it has range of up to 1200 degrees.

Tester


#8

Could be a blown head gasket.


#9

I just wanted to follow up with this. I talked to my brother-in-law recently who said he got his truck fixed. Turned out the fuel filter was full of water, and after installing a new filter, the truck runs fine.