Diesel EFI

[Shannen Durphey]

If the timing offset is not withing the correct range, the pcm sets a
trouble code.  And it's almost always a "right now" kind of thing.  If
the pump is installed within range, the engine usually runs with no
trouble code.  IIRC, the # to shoot for is -.75 degrees offset.  I've
deliberately tried to set the offset at the low end, then advance the
timing slightly.  But there's such a small amount of variation which
is allowable, it's very difficult keep the pcm happy.

Shannen


Programmer wrote:
> 
> Did the shop perform the TDC relearn, set timing properly, etc ??? There's
> an offset that must be learned,
> otherwise the entire timing curve is incorrect--especially
> the start up timing. If they failed to check the glow plug
> circuit--I'd find another shop <g>.
> Lyndon
> 
> ----- Original Message -----
> From: <sapearso at collins.rockwell.com>
> To: <gmecm at diy-efi.org>
> Sent: Thursday, November 16, 2000 1:15 AM
> Subject: Diesel EFI
> 
> >
> > Have a bit of a strange one, see if anyone can help. I have a 94 Chevy
> > truck with a 6.5 turbo diesel. It's having a cold start problem.  After
> > cycling the glow plugs, you have to hold it about quarter to half throttle
> > to get it to start, then it smokes alot (like can't see thru it alot).
> > Here's what's been done recently: new electronic injection pump, new crank
> > sensor, new timing chain & gears. The injectors were 'pop' tested while
> the
> > engine was apart and checked good.
> >   The first injection pump I put on was faulty. I took it to the dealer
> and
> > they put the second one on. The first one not only had the cold start
> > problem, but it also stumbled off idle, no matter how warm. This one runs
> > great once it's started. The dealer told me that it was probably a crank
> > sensor. Put the o'scope on it and it looks fine.
> >
> > Any ideas???
> >
> > Scott Pearson
> > sapearso at collins.rockwell.com
> >
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