The dealer called. They are doing nothing for my engine.

The Short version is that the 3.5L DI is designed to put oil from teh crankcase (throuh the emissions system) in the intake maniflold. This causes 'carbon build-up' that is not covered under warrentee.

THing is, it's a known issue, I'm told. Although, cleaning out carbon, or a procedure for cleaning carbon, is not mentioned anywhere in the Isuzu manual under preventitive maintinance.

I need to call Isuzu engineering. They need to tell me something I don't already know.

Questions:
- Exactly, what is causing the carbon build-up?
- How does one prevent it from happening?

Sounds like a miss-functioning system designed to burn oily crank case vapors.


What a pain. I'm the only one on this forum wtih this problem, and yet it's a common issue? I'd think that someone else here would know. It could be something as simple as my choise of oil.