Need a little help for a friend.
 

My buddy just bought an 04 6.6L chevy and hes been asking for my advice on stuff. I'm a ford guy and I don't know much about the 6.6 so I was hoping someone on DB could help me steer my friend in the right direction. He doesn't want it for racing or sled pulling he's just going to tow a horse trailer and work around the farm. Are they're any problems that I should warn him about?
Thanks guys

is it a lb7 or lly, the 8th digit of the vin shoud tell you what it is.

1 = lb7
2 = lly

First off he needs to find out if his engine is the LB7 or the LLY. There is a TSB on the LLY for the injector plugs for the number 2 and 7. This is an easy repair and is the only common problem I have encountered. As for the LB7, haven't seen many problems, the typical water/contamination in fuel causing injectors to go bad. As for mods, about the same for other diesels, intake, exaust and a tuner. The d-max responds very well to a tuner. One thing I do preach is having a good, clean supply of fuel and highly recommend a FASS or similar system on any diesel truck. Yes they can be expensive, but the reward of saving injectors, pumps and other expensive parts is well worth the initial cost.

alright thanks

Here is a few cheap mods you can search for an LLY truck.

EGR block and finger stick

Resinator plug

Mouthpiece Mod on turbo intake

CCV rerout

Enjoy