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  #1  
Old 03-24-2002, 01:01 AM
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Join Date: Mar 2000
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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, 05:14 PM
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Join Date: Mar 2000
Posts: 529
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.

Thanks.
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  #3  
Old 03-25-2002, 07:23 PM
HGV HGV is offline
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Join Date: Sep 2001
Location: San Francisco
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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?

Henry
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