Common

I was behind it on 11 - no smoke at all, didn't know it was a diesel. We come to a stop and this thing is belching smoke all over the place - he takes off, lets out a larger puff of white and blue - no black and it clears up again.

Whats wrong?

Injector?

mishkaya

Most likely injectors indeed.
mishkaya

j-fox

Defective.

Rampage1967

C H E V R O L E T

any more questions??

67HotRod

Injectors.

Mattster

Probably one with the LB7 which had serious injector issues. Some would last 150,000 miles, others 800 miles. And to get at the injectors you have to pull the valve covers. Kind of sad that nobody noticed this before they released it, also sad because the injectors are made by Bosch if I remember correctly and they usually make good stuff.

Hvytrkmech

Exactly why G.M went to 2 micron filtration. They also warrantied the injectors in the LB7 for 200k. My cousins 04 Duramax did the same thing, it wound up being a couple injectors and a head gasket.


Tim

DuaneWKKC

yep, chevy at least tried to take care of their customers, wish the ram would stand beside their products instead of behind their customers..... BOHIC


DuaneW.

duratothemax

no, dirty/underfiltered fuel isnt the problem. We all wish it was because then everyone could just install a nice aftermarket filter or fass or something and never have injector problems again. But thats not true.


ben

Hvytrkmech

Actually it was and is true. What happens to steel subjected to extremely high hydraulic pressure with fine particulate matter mixed with the liquid?



Tim

madhat

Failure. Or sanding...

BOHIC...A....

duratothemax

actually no its not true....... filtering the fuel better doesnt make any difference. LB7 duramax injectors will still fail regularly regardless of how good the filtration is.

ben

Hvytrkmech

Ok, what is the primary cause of failure for the LB7 injector?



Thanks,


Tim

scottsjeeprolet

A friend of mine has an 03 and has had to change the injectors every 50K. He actually knows when they are going bad. Now that it has 230K on it he's getting rid of it.

duratothemax

nobody knows. There are many different theories, but none proven. There is no sure-fire definite fix. GM will cover everything up to 200k miles, but after that, they will still fail, and the owners will be forced to start replacing injectors themselves.

I have my own theories, but I cant prove them in any way.

Bottom line; its not dirty fuel that causes them to fail, that is 100% proven fact.

ben