Also, lately while driving, usually at cruising speeds, the engine seems to be hesitating somewhat.[/Quote]
I'm going to put you out of you're misery so you won't have to go through what I went through. You have a bad PMD (Pump Motor Driver also called a Fuel Solenoid). It is attached to the right hand side of the injection pump. These things go bad so often, and mysteriously they have been the terror of all diesel Silverado owners; until they figure out the symptoms. Stalling while driving, hiccupping then refusing to start, etc. Go to accuratediesel. Com for a good description and diagnostic criteria for a bad PMD.
They also sell a retrofit which will save you hundreds of dollars in repair bills. With a retrofit you can relocate the PMD rather than replace it, in its difficult to get to original location. There are many of these plug-in retro fits out there. Accurate just has a great price and one of the best diagnostic descriptions I found in my search. .
The PMD can go bad on its own, but it can also go bad because of the lift pump. If your truck starts when you install the new PMD, but continues to hiccup, replace the lift pump ASAP before the old one ruins your new PMD. Good luck.
The PMD is the most common part to cause engine failure in the Silverado.
Monday, October 22nd, 2007 AT 10:20 AM