I've learned a bit since discovering this site a couple of weeks ago and it's been helpful!

My problem is: after injector pump and throttle replacement on my '99 Sierra 6.5L, the truck still doesn't want to start in cool (45*) or colder temps. I have put fuel treatment in the tank, but it has only gotten to 37* in the morning so far and it still fights me. The truck pukes white smoke like crazy while cranking. I didn't have this problem last year. It also seems a little low on power by memory. They mentioned having trouble timing the pump.
(1) Was the PMD supposed to be replaced along with the pump?
(2) Is there a way to test the old TPS pedal assembly by ohm-meter to see if it was out of operating spec?
With help from this site info, the injector pump was replaced under warranty (thank you). However, they didn't replace the PMD. I can tell by the flashlight that there is diesel soot still covering it. I was hoping it would be replaced as well. BTW, the WATER IN FUEL light never lit no matter what prior to service. After the pump replacement, it lights as it should when the key is turned on.

Welcome, Sounds like time for new glow plugs. Check out this link should help.
http://dieselplace.com/forum/showthread.php?t=49499

I would be raising some major he!! if the new pump didn't get a new PMD since the rebuilds that GM gets has a new one on it. Your smoke sounds like glow plugs. Look at the top of the 6.5 page for the sticky about glowq plugs.

Thanks guys.

Also, the service department said they had to send one pump back because the supplier said it had to have some other number on it for the warranty work. Another pump was sent in for the work. Does that sound right to you? They mentioned a fuel sample was sent too before they were allowed to do the swap. Thanks to this site, I had run the tank nearly dry a couple of times, drained the water tap twice and changed the fuel filter before taking it to the dealer for checking out. No water was found anyway, but I felt better doing it.
So what's the pump exchange issue that they had to send one back? I took the truck back today because (1) no new PMD, (2) won't start (3) greasy footprint in the floor.

Sounds like a load of B.S. there. A friend of mine works for GM on diesels and he told me the pumps are shipped to them from a special department in GM, they can't actually order them. It was the same when I worked at Dodge on the cummins engine, the injection pumps were sent to us directly from a special department and the only way to get one was to go through a checklist of diagnostics over a hotline. Sounds like you got one of those dealers.

The IP had lost timing and seven glow plugs were bad. Good shape now and much better power.

only seven?

LOL, I think someone just couldn't (didn't want to) reach back and get #8 out for you.

I was thinking the same thing, I would 've changed it just cause myself.

Hey, can't you guys reach that glow plug from underneath? That's how I reach mine with the van body style.

I can reach #8 from above, but it's a tight fit. #6 requires the DP to come loose.

Interesting that you mention that, I didn't encounter interference with accessing #6 GP until recently, it would seem that depending on exactly what crimps the General decided to put in each particular DP is the determining factor.