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  #1  
Old 10-17-2004, 10:30 AM
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Join Date: Feb 2004
Posts: 7
1983 300 SD Rough Idle Sometimes

Car starts and runs fine until engine is up to temp. Sometimes the car idles rough and other times idles great.

It appears when the car is idling rough, I can push down on the gas pedal to raise the RPM's and it smooths out.

If the idle is set too low it would run rough all the time right?

Any ideas besides a bigger hammer?

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  #2  
Old 10-17-2004, 11:06 AM
bullwinkle's Avatar
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Join Date: Jun 2004
Location: cincinnati
Posts: 377
I have the same problem with my 300DT-I am going to do a compression test and get my injectors cleaned and balanced-if you do a search, you'll see that those are 2 common causes(along with the much harder to fix stretched timing chain problem). Does your car fly down the interstate smooth as silk and then shake and smoke like it's possesed on the offramp? It must be mine's long lost big brother!
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1982 300DT 190K (Diesel Purge + synthetic oil=smoothness at last!!!)
2004 Ford E-350 6.0 L PSD 227K
2006 Dodge Ram 3500 SRW HO Cummins 4X4 48RE 42K (brute force tow vehicle)
2005 Scion xB wife's rolling pop can
1993 GMC Sierra C3500 6.2 142K
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  #3  
Old 10-17-2004, 01:58 PM
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Join Date: Aug 2001
Location: Northern Virginia
Posts: 2,911
If by "rough idle" you mean the car shakes, that's most likely the old rack dampener bolt on the back of the injection pump. I've done that replacement plus the engine mounts and engine shock absorbers and it totally solved the problem.

Search on "rack dampener" here for more details.

The classic symptom is a rough hot idle - especially after a long highway run.

Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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  #4  
Old 10-18-2004, 09:15 AM
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Join Date: Feb 2004
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Quote:
Originally Posted by bullwinkle
I have the same problem with my 300DT-I am going to do a compression test and get my injectors cleaned and balanced-if you do a search, you'll see that those are 2 common causes(along with the much harder to fix stretched timing chain problem). Does your car fly down the interstate smooth as silk and then shake and smoke like it's possesed on the offramp? It must be mine's long lost big brother!

Yep, the car flys down the highway, hit the offramp and it starts rocking, shaking but doesn't smoke. Again, doesn't do this all the time. Anyway thanks for the advise.

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