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  #1  
Old 10-08-2002, 08:49 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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  #2  
Old 10-08-2002, 10:10 PM
CJ CJ is offline
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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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  #3  
Old 10-09-2002, 08:23 AM
The Least of These
 
Join Date: Jun 2002
Location: Exton, PA
Posts: 559
CJ,

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

-Slowmoe
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  #4  
Old 10-09-2002, 09:41 AM
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Join Date: Aug 2002
Location: Vancouver, BC
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My gut says its not the glow plug. Sounds to me like an intermittent problem with an injector.
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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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  #5  
Old 01-15-2003, 06:19 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...?
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1996 (W210) E300D 86K - Traded in for a Lexus
1992 (W124) 300D 2.5 Turbo 202K - Sold
1983 (W123) 300D, 146K - Sold
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  #6  
Old 01-15-2003, 11:24 PM
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Join Date: May 2002
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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.
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'91 300D 2.5 Turbo 330K
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