Max.Thanks for the link and info.I had considered the mechanical stop and 
deleting the idle circuit, though I'd prefer to fix it as originally designed, 
but that would still give me an erratic tacho.Onward and upward!

Fred Moir.Lynn MA.Diesel preferred.

> Date: Wed, 17 Jun 2015 13:02:04 -0400
> To:
> Subject: Re: [MBZ] MBZ Tetchnickel kweationz.
> From:
> CC:
> Win 7 is no issue, you just need to get Steve Nervig's web front-end for
> the CD's, follow the directions to copy the CD's to appropriate place on
> your HD and then create a shortcut in Firefox that points to Steve's
> menu-launch hyperlink.
> Downloads and more info here:
> Could be OVP relay getting flaky, or the electronic idle control solenoid
> (ELR) on the back of the injection pump, or engine harness wiring is
> detiorating.  There is a two-pin connect to the ELR which is hanging on the
> back-end of the IP, try pulling that off to see if that clears the
> symptoms.  That should cause your idle speed to drop to the mechanical
> adjustment, which is supposed to be set around 550 RPM.  You can manually
> increase that to whatever you like.  My idle used to be really rough, I
> pulled off that ELR connector and adjusted the idle speed up to about 750
> and ten years later that fix is still working fine for me.
> -------------
> Max

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