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Old 10-08-2002, 09:49 PM
The Least of These
Join Date: Jun 2002
Location: Exton, PA
Posts: 559
2.5 rough cold idle

When I started my car this morning, it ran rough for the first few minutes. Not a bad glow plug rough, no smoke. It would rev then shutter, rev, then shutter until it hit operating temp. What do you think???

1992 300D 2.5 Turbo 174,000 miles
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Old 10-08-2002, 11:10 PM
CJ CJ is offline
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Join Date: Jun 2000
Location: Earth
Posts: 1,318
Try checking the glow plugs. The 602.962 motor does have a self diagnostic on it for the glow plugs, but you can have a bad glow plug and still not have the diagnostic light be triggered.
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Old 10-09-2002, 09:23 AM
The Least of These
Join Date: Jun 2002
Location: Exton, PA
Posts: 559

Thanks for the reply. I would imagine a rough idle rather than revving if it was a glow plug issue. Am I mistaken?

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Old 10-09-2002, 10:41 AM
BlueBabyBenz's Avatar
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Join Date: Aug 2002
Location: Vancouver, BC
Posts: 151
My gut says its not the glow plug. Sounds to me like an intermittent problem with an injector.
MB 1986 190D in my past
MB 1987 300E on the street
MB 1994 'Smoke Silver' E420 in my driveway
1999 Mazda Miata in the fun stable
1964 E-Type Jaguar Coupe- Sold
1970 E-Type Jaguar Coupe- Sold
1968 Corvair Monza Conv. with Turbo Transplant- Sold
1986 Merkur Xr4ti- abandoned
various mundane American autos

If I'd known then what I know now...

Hell, I'd probably still have done it anyways.
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Old 01-15-2003, 07:19 PM
The Least of These
Join Date: Jun 2002
Location: Exton, PA
Posts: 559
A few weeks ago I finally got around to running some diesel purge through the beast. It still does this silly high-low idle revving thing until it reaches operating temp. I am imagining an electrical reley, auto-choke, throttle body position sensor or something like that that may be the culprit.

Any thoughts...?
1996 (W210) E300D 86K - Traded in for a Lexus
1992 (W124) 300D 2.5 Turbo 202K - Sold
1983 (W123) 300D, 146K - Sold
1970 280S, 263K - Sold - Beginning of addiction
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Old 01-16-2003, 12:24 AM
Registered User
Join Date: May 2002
Location: Burbank, CA
Posts: 597
I just drove 2700 miles from Southern California to Washington state and back over the holidays.

While in snow country, my glow plug light refused to come on when I turned the key. After waiting 30 or more seconds, the car fired right up, but ran rough. The glow light also came on -- after I started the car, but went out after a minute or so. After the car warmed up, the engine smoothed out and cruised for hundreds of miles each day.

Upon my return, I discovered that the No. 4 plug was dead. New plug, problem gone.

Good luck.
'91 300D 2.5 Turbo 330K
'00 VW TDI Golf, 190K
'67 BMW R50/2
'73 Norton Commando Interstate
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