I have a 2003 GMC Sierra, and recently lost acceleration and was towed to Dealer. I was told that the trouble was defective fuel injectors. This took five days because of the Christmas holiday, and just got the truck back this morning, 12-30-04. After about 10 miles the truck started blowing smoke from under the hood, and I took it back to the dealership. I was told there were no leaks and this was normal when working on a Diesel, and I needed to give it time to burn off all the fuel and oil that was spilt on the engine. After driving home from work, I decided to investigate the smoke myself, as it had gotton much worse and discovered the smoke bellewing from a copper like tube coming out of the front passenger side of the block. My question is; Could the dealer have missed this?, Did the mechanic make a mistake?, Could there be internal engine damage form the faulty injectors?, and Is there a possibility, as I have read on the web, that I will always have trouble with this engine now?
Thank You

Sounds like combustion gasses getting into the crankcase past a loose/missing copper washer on an injector. An apprentice at our shop did this before. The tube at the right front of the engine is the crankcase breather tube. Get it to someone who knows what they are doing.

Thank You for the quick response. Will it damage the truck if I drive it, or should I park it?

That white smoke is unburnt fuel. I would not drive it. This is, of course, only if I am right. But I usually am:D

Thanks again. Can I use your thread when I go in to the dealership tomorrow, and when I talk to the girl at GMC on tuesday? I am already in the process of finding a qualified diesel mechanic, but they tell me they have to verify that the dealership will agree to fix it.

You bet. Hell, have it towed here!