2002 sierra denali will not start

[broncoflyer]

Hello, I am at my wits end. I need help. 6.0l gas engine. Wife comes home from work and parks last Wednesday. Next morning truck will not start.has barely ran since. Towed it 2 1/2 hours away to gm shop and they can't get it to run either. Codes that show up are p0101 and p0107. The odd time engine does run it spit exhaust out oil dipstick and fillr neck. Replaced Maf sensor on a hunch but no change. Map sensor checks out fine with a multimeter. For the 30 secs it does run itcslaps and bangs and you have to keep feathering the throttle but it eventually dies. Lots of fuel pressure. Seems to me that the timing is way off if this was a distributor truck. Scantool said spark advance was -64 once when I was turning it over. Gm mech says he this now the exhaust has frozen and plugged up but that's pretty blak smoke coming out the back. I'm up to a grand for the shop leaning over the grill not to mention the tow bill. Please help..I still have to get it home again.very cold here.-20 degrees celcius. Thanks for any help anyone can offer

[Doug_Scott]

You should always start iwth the basics. Engine needs 3 things to run, fuel, compression, and spark. I do not see where you said they checked compression.

 

If you are getting a lot of blowby coming out dipstick you need to resolve that as well.

 

How many miles on the engine? When the wife came home from work, was the truck running fine for her, no warning lights, running smooth? When the truck was parked and turned off, did the engine stop like it always has, or was there something different this time?

 

Short list of things to check, compression, timing chain condition, condition of fuel in tank. By that I mean did the wife fill the truck up on the way home from work? Could she by chance get the wrong pump, and filled up with diesel?