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Old 03-24-2002, 12:01 AM
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Join Date: Mar 2000
Posts: 517
Elevated Idle Speed - '87 300TD

1987 300 TD, with 88K miles, has started to exhibit an elevated idle speed (approx. 1200 rpm), in neutral and in drive, at the end of non-stop 200 mile interstate drives. When allowed to cool overnight, the idle speed returns to normal and does not recur during city driving. With the exception of the elevated idle speed, the engine behaves flawlessly, with no other symptoms present.

Any ideas as to the cause of the idle speed elevation?
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Old 03-25-2002, 04:14 PM
Registered User
Join Date: Mar 2000
Posts: 517
Any ideas? Injection control unit?

Dealer won't look at the vehicle without the problem present and its difficult to do a 3 hour interstate drive just prior to taking it to the dealer.

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Old 03-25-2002, 06:23 PM
HGV HGV is offline
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Join Date: Sep 2001
Location: San Francisco
Posts: 357
I have an 87 300TD that was occasionally having a fast idle at infrequent intervals. I ran some diesel purge through the system and it seemed to take care of the problem.

Does your car have 88K original miles? If so, interested in selling it?

63 190d (sold)
69 220D (sold)
69 280SL (sold)
76 BMW 2002 (sold)
86 190E-16v(best 4 banger around) 195k
87 300SDL (sold)
87 300TD 280k (sold)
95 E320W 211k
95 E320w 111k
05 C320 4matic
06 E320 CDI 90k
2013 GLK 250 Bluetek 4MATIC
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