2005 chevy 6.6L turbo deisel losing power and blowing black smoke

Hello Stuart,

It sounds like you may have a cracked water jacket or a failing head gasket. This is a major repair. It would be best to take it to a certified mechanic.

Yours should be a 2.9 crd Turbo diesel if I'm correct & from what your describing sounds like you need to change out the diesel filter. These filters get clogged causing lack of power specially going up hill.
Is it blowing out black smoke? There could be other problems as well. Need more info like is the engine light on?

Run a diagnostic check, if she's 1.4tdci it can be various things like EGR, Air Mass Sensor etc. Is there black smoke coming out of it? Check Turbo.

Sounds like a head gasket leak on the intake side or intake gasket. Your boost is leaking out and coolant is leaking into the cylinder. Get a bulletproof kit. It is well worth the money

turbo seal is blown allowing oil into air intake charge-white/blue smoke=oil- black smoke=rich fuel mix-replace turbo-cheers Denny

1. check charge air tube,loosing boost pressure=low power and black smoke
2. check for air filter restriction,if it cant breathe it will blow smoke and run like ****
3. check for rotational drag on the turbo compressor wheel, it may be locking up causing low power and black smoke, much like cummins vgt turbo
4.oil quality,poor oil quality, ie long intervals between oil changes.
5. may have a leaking injector, not common with this style of injector but i wouldnt rule it out if nothing else checks out.....hope this helps.

if its black smoke and id say it is being a deisel it can be injectors or just simply fuel pump timing. get it to a deisel specialist to check the pump timing and your fuel load under acceleration, only real way to get it sorted.

The black smoke is blow-by you need a ring job. Oil is getting by the top ring of your pistons in one or more cylinders. Loss of power under a load is also indicative of this.

my 2003 f350 6.0 started to have turbo lag when in a strain and i can give it more fuel and it will blow out alot of black smoke and it clears up does anyon have any sugestions on what it could be

Blown head gasket or contamination of oil from other sources. Time for a compression test to be sure....accordianman