white smoke, no power

[matuva]

Hi all,

a guy with a 1997 K1500 is experiencing some problems: engine was running fine, then suddenly stall while cruising, climbing a slope.

Now, it seems the engine is misfiring in 1 or 2 cylinders, produces white smoke, and has low power.

Though, once he reaches 1500 rpms, things clear, and engine is plenty of power.

The MIL is off, and I haven't collected any possible codes yet, will do that ASAP.

Any suggestion?

 

[matuva]

Successfully passed the "IP test"

We can rev the engine to 2000 rpms, hold it stable at 2000 rpms for the time we want, then slowly release the accelerator so as to slowly decrease rpms.

Seems so the IP is OK...

 

[NVW]

Maybe got some air it the system Al.

 

[greenmeanh1]

Manifold or turbo air leak!!

 

[matuva]

Could it be optic sensor or armature of IP starting to quit?

 

[WarWagon]

White smoke is timing on a hot engine. (Usually retarded.) Also fuel starvation/air. Check the lift pump PSI.
Then I would reset the TDCO etc. and see what it comes up with.
Still missing then I would check the rocker buttons. Use an IR temp gun on the exhaust manifold to see what cylinder is 'missing'. Possible burned valve.

 

[matuva]

Also, we noticed that some bubbles are coming out at the headgasket, around cylinder #7...

Blown headgasket? But could the engine work perfect above 1500 rpms with a failed headgasket?

 

[3500GMC]

Steam is white out of the pipe as well. Bubbles on ANY gasket is not good captain.