Re: 6.5T smokes

Posted by jdemaris on September 24, 2006 at 11:10:10 from (66.218.14.205):

In Reply to: 6.5T smokes posted by MF294-4 on September 24, 2006 at 09:07:31:

I haven't seen all the info on your truck. First question, is it a VIN code S? If so, GM's got the fuel turned up pretty heavy on that optional version of the 6.5. I think it was only legal over a certain GVRW class. Take a heavy fueled engine to start with, and add a few variables like late injection and weak firing-pressure in a cylinder or two, and you're bound to see smoke - especially when cold.
I'm wondering if you had both heads and/or exhaust manifolds off? I'd be nice to see the exhaust ports - and see if any one port is dirtier than the rest. We had smoking problems with tractors - especially when cold and sometimes warm/no-load. It was nice to be able to pull the exhaust manifold, run it, and watch where the smoke was coming from. In your case - I assume - you don't know if the smoke is generalized and coming evenly from all the exhaust ports - or perhaps centralized from one cylinder. Knowing that would make a big difference.
I will say, every time I hear of problems - that are compounded by the convoluted system Stanadyne/GM starting using in civilian diesel vehicles around 94 - I'm real glad to have all mechanical systems on mine.
When GM gave up on the 6.5 and changed over to the Isuzu V8 diesel, it made a statement claiming that 6.5's electronically-controlled injection system was not cost-effective in trying to meet the ever-more restrictive emmissions regs. I also suppose it wasn't cost-effective because of the law-suits against them for the early 1994-1997 electronics failures.
I'm not being a wise-guy - in fact, I'm a lifelong Chevy fan. It seems GM (or Stanadyne) did a pretty good job in later years correcting most of the problems that trucks like your's had - and I suspect by this time, your's has all the updates.
In regard to changing your injectors - I cannot believe it will make any differece.
It would be interesting to jack up your timing advance at cold start and see if you get an instant improvement. But, even if you do - sometimes doing such is sort of a "band-aid" for other wear problems.

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