early 2000's Duramax now hazing at idle

[fest3er]

Neighbor's got an early 2000's Duramax with 110K miles on it. It's just started hazing a little at idle and will blow a little more smoke when revving it in neutral. It seems to idle and run as smoothly as ever, though it may now have a bit of a lope at idle. There's no sign of soot on the exhaust corner of his truck or on his fiver. It is pretty much bone stock. I think all he's replaced are front wheel bearings and/or ball joints. And tires.



He'll likely take it to his dealer for a checkup. What would *not* be unreasonable for the dealer to tell him? Fuel filter (which he typically overlooks)? Injectors are nearing EOL? One or two injectors are leaking? Would the dealer's computer be able to illuminate the problem? He wants a clue as to what he should reasonably expect.



Thanks!

 

[Wingate]

If its an LB7 D-max, I'm surprised that it made it to 110k before losing the injectors. .

At one time, GM was giving 200K warranty on the injectors of LB7 engines. Not sure if there was a time limit on it... but I know the mileage limit was 200K, injectors and labor only...

I would also pull the dipstick, these engines (LB7) were notorious for pumping fuel into the crankcase.

 

[fest3er]

He said it's an LB1, and that it has a 200k/7yr warranty on the injectors (and some other stuff; dealer said his wheel bearings would've been replaced under warranty, too). He's making arrangements today to get it looked at.