Yeah in your case with no reference you get nothing. I think you could get away
with one of the others going out but not #1. I had the same issue on my '83
240D back years ago. Changed the plugs in the dark at 10F. Now at the first
sign of any trouble I change 'em all. Dr. Booth used to chide me for throwing
away "perfectly good" plugs. I countered that the others are "nearly failing"
and I was changing them for a good reason.
-Curt
Date: Tue, 30 Oct 2012 09:53:45 -0500
From: Hans Neureiter <diese...@gmail.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Subject: Re: [MBZ] Glows
Message-ID:
<caojz3l_pjqcddcj7vpyd6ckjntf-nw4c1ykqmn8myh+-vdm...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
'82, 617 w/ pencil plugs.
Correct me if I err, the circuitry in the GPR compares the resistance
value of #1 with the sum of the other four. Should be 1:4 but at minimum
1:3.
In my case #1 was dead (OL:4) - thus no light (and no glow at all?).
Replacing #1 accomplished light back on (~5 sec.), easier start and lot
less smoke on start.
It's glowing again!
On Mon, Oct 29, 2012 at 4:00 PM, Curt Raymond <curtlud...@yahoo.com> wrote:
> What year? 617 engine? I did glows on my '81 300TD without removing
> anything. Its dammed fiddly but can be done.
>
> AFAIK no light = no glow at least at first, at some point the light goes
> out even though glowing may continue.
>
> -Curt
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