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#1
10-30-2003, 09:10 AM
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1992 300SD rough idle once in a while
Hello. I Also have 1992 300SD and the minute I start the vehicle it works perfect, but once in a while the rpm's jump up and down (for about 2 sec) and then it works perfect again.
What can this be? Thank you Steven 
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#2
10-30-2003, 03:31 PM
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That engine (OM603.971) has a computer controlled idle speed actuator on the injection pump. It's possible that a bad connection is allowing an intermittent fluctuation in idle speed. Otherwise, it would be very hard to diagnose without more information...
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#3
10-31-2003, 09:45 PM
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timing
have someone qualified check your glow plugs if its not that then i say
Check the injection pump timing then check for timing chain stretch..
__________________
1994 S-350 6cyl Turbo Diesel 158k 1998 300d 6 cyl Turbo Diesel 143K 1993 2.5 124 Turbo-Diesel 236 1990 2.5 124 Turbo-Diesel 228k 1983 SL-500 EURO W/HEATED SEATS 40K SOLD 1977 Jaguar XJ6 Coupe Antique Roadster 85K SOLD 1993 2.6 6 cyl 190 E 150k  SOLD 1992 2.5 124 Turbo-Diesel 204k RIP 1992 124 300 TD 265K OIL PUMP QUIT @ 85MPH
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#4
11-03-2003, 01:48 PM
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Glow plugs only operate at cold start - they have nothing to do with idle speed after the first minute after a cold start. Injection timing won't do it either. A bad injector is another possibility, or a leaking seal inside the injection pump.
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