Does your ABS light also come on at the same time?  If so, your overvoltage 
relay is going out, or has a loose connection. When it starts working again, 
it will start idling normal and the glow light will come back on.

---
Kaleb C. Striplin
Cox Auto Trader
730-Tulsa FSBO Supervisor

----- Original Message ----- 
From: "OK Don" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <Mercedes@okiebenz.com>
Sent: Tuesday, December 18, 2007 10:24 PM
Subject: [MBZ] Glow light - '90 300D 2.5


> The glow light has started acting strange in the '90 300D 2.5.  It
> doesn't light when you turn the key to the glowing position (I did
> verify that the plugs get electricity in this position), the car
> starts right up, idles faster and rougher than usual, then about 30
> seconds later, while driving down the street, the glow light comes on,
> and stays on for 30 seconds to a minute (haven't timed it - seems
> forever), then eventually goes off. At the next stop, the car idles
> normally.
> I assume the glow light issue is the glow plug relay, but what about
> the idle - I'm guessing the electronic idle controller is wonky? Are
> the two electrically related somehow?
> The glow plugs and the relay fuse were replaced last Spring.
>
> Any guesses, or informed opinions?
>
> -- 
> OK Don, KD5NRO
> Norman, OK
> "There are three kinds of lies: lies, damn lies, and statistics."
> -Benjamin Disraeli and/or Mark Twain
> '90 300D, '87 300SDL, '81 240D, '78 450SLC, '97 Ply Grand Voyager
>
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