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  #1  
Old 09-22-2001, 09:59 AM
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Join Date: Aug 2001
Location: Central California
Posts: 32
Thumbs down How to adjust Idle speed - 86 300e

How do I adjust idle speed on a 300e? I have looked at the cd and I can not find the info on my engine: 103.983 Is there a mechanical adjustment on this engine. Should the idle be at 750 rpm's +/- 50? It is an auto trans.
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Old 09-22-2001, 11:47 AM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Larry:

Idle speed is set electronically on these engines and isn't adjustable. Should be 750 rpm or so in neutral, 500 rpm in gear when warm, higher when cold.

If it varies, car dies sometimes when coming to a stop, or idles rough, check the idle valve -- there are a large number of posts concerning idle problems on these cars!

Erratic idle is a sign of a vacuum leak, and in spite of all the electronic fuel injection and mixture control, vacuum leaks still can cause funny idle -- check all the rubber hose ends, etc!

Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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  #3  
Old 09-22-2001, 03:14 PM
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Join Date: Aug 2001
Location: Central California
Posts: 32
Thanks for reply

I appreciate your reply. I took off the air filter to take a look see and then decided to see if anyone had responded. I am glad I did not go any further. Thanks.
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  #4  
Old 09-22-2001, 04:10 PM
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Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Larry:

Is this car new to you? If so, I'd check to see that the air filter housing mounts were good (mine were broken!). They are little rubber gizmos that have a bolt on both ends -- one goes to the nut holding the bottom half of the housing in place and the other into the head or intake. If they are broken, you can get dirt in the intake -- read worn out motor!

All the rubber parts in the engine compartment will die on these cars with heat and age -- I've replaced all the rubber connectors on the various vacuum and manifold pressure signal lines, and the idle valve hoses. Makes a huge difference!

Peter
__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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