Re: What's wrong with Chevy/GMC diesel pickups?

Posted by jdemaris on January 12, 2006 at 05:45:02 from (66.218.11.236):

In Reply to: Re: What's wrong with Chevy/GMC diesel pickups? posted by Bob on January 11, 2006 at 21:29:22:

I've worked on many light-duty 94s that have mechancial injection with the DB2-4911 Roosamaster/Stanadyne pump. But . . . I don't know if they were original or replacement/repairs. When G.M. began using the electronically controlled pumps in 94,there were so many failures that many repair shops simply converted them back to full mechanical. The military vehicles still use the mechanical and still use the 6.5. Those diesel Hummers over in Irag aren't using Isuzu diesels. Another company is making the 6.5 engines now.
As I recall, G.M. didn't know what to do with the early pump failures since it was - more-or-less a warranty problem with Stanadyne/Roosamaster. So - for quite a while the alledged "fix" was to replace the entire pump - which was rediculous. And, it seemed that, at first, the replacement electronic pumps were no better than the originals. If somebody had to spend "out of pocket", in my opinon, the money was better spent on installing the fully mechanical setup. You can buy a rebuilt DB2 mechancial pump in the $400 range, but the electronic DS4 is often over a $1000. Seems there was a class-action lawsuit against G.M. and Stanadyne, but I don't know what became of it.
Those trucks with the electronic pumps still have mechanical indirect injection - it's just the pump that is electronically controlled.
Ford had the transition from IDI to DI in 94 which I also find confusing. I've seen some 94s with both so I don't know when the change was official.

Replies:

• Re: What's wrong with Chevy/GMC diesel pickups? Bob 07:17:06 01/12/06 (0)

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