GMECM Digest V2 #637

[sapearso at collins.rockwell.com]

Is there any way I can set this timing myself? I know when we put the first
injection
pump on, we took it to a different dealer to have the timing set. Also, how
do you set
this offset? Need to get new software for my scan tool, will find someone
to check the
coolant temp. As you can tell, I'm not too experienced in the diesel world.
It sure
does yank the trailer around nicely though!

Scott Pearson
sapearso at collins.rockwell.com

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Date: Thu, 16 Nov 2000 19:35:59 -0500
From: Shannen Durphey <shannen at grolen.com>
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


Date: Fri, 17 Nov 2000 11:29:20 -0700
From: "Programmer" <nwester at eidnet.org>
Subject: Re: Diesel EFI

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.

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