Diesel EFI

[Programmer]

Whooops--that's right. Forgot about that. Hopefully he's reading along
still.

Check the ECT sensor with a scan tool. Compare the engine coolant temp
against ambient or a good Raytech. If it's reading warmer than normal--the
glow plugs won't cycle long enough (If I'm recalling correctly) <g>.
Another thing... the lift pump may be getting weak...and the check valve has
failed. This makes extended cranks the norm. Gotta freshen up on my diesel
stuff...

Lyndon.

----- Original Message -----
From: "Shannen Durphey" <shannen at grolen.com>
To: <gmecm at diy-efi.org>
Sent: Thursday, November 16, 2000 5:35 PM
Subject: Re: Diesel EFI


> 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
> > >
> >
> --------------------------------------------------------------------------
> > --
> > > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the
quotes)
> > > in the body of a message (not the subject) to
majordomo at lists.diy-efi.org
> > >
> >
>
> --------------------------------------------------------------------------
--
> > To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> > in the body of a message (not the subject) to
majordomo at lists.diy-efi.org
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org