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Old 08-22-2016, 10:04 PM
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Join Date: Aug 2016
Posts: 2
Angry 1986 mercedes 300 e class

Barn find. sat for a number of years full of gas. had to replace fuel pump and filter. hard starting. have to crank a long time when it does start runs rough for a bit then idles up to 1500 and wont idle down.Drained all gas and filled with 91 octane. what could make it act like it is? also put in new spark plugs. Really sharp car if I can make it run. 250000 miles, don't smoke. any ideas?

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Old 08-23-2016, 10:23 AM
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Trevor Hadlington
Join Date: May 2014
Location: Worcestershire in England
Posts: 1,379
My bet would be vacuum leak .Check all small pipes and the conectors for splits. Under the air filter you will see a part with a conection on the rear ,its held in with a saddle and 2 screws ,on the rear it will have 2 hoses remove them and wash it out with white spirits or carb cleaner Then replace it .Also the top of the throttle plate ,spray this also with carb cleaner.. Next check all fuses ,the ends go white with corrosion and dont make contact. Give them a twist in the holders .Then all earth points want cleaning 90% of electric problems are earth related.Remove them clean and a little grease on the end , now pop the screw back in the end and lock it up. Come back after you have done this. As i now a few more things you can try out . One thing first ,spray the top of the injectors seals with Wd40 fluid see if it changes the speed of the engine..If so the seals have gone in the fuel injector seats .
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Old 08-23-2016, 12:54 PM
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Join Date: Jul 2011
Location: bellevue, wa.
Posts: 119
Check the overload protection relay.
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Old 08-23-2016, 02:27 PM
Registered User
Join Date: Mar 2003
Location: Southern California
Posts: 2,165
Check nearby threads on hard starting/rough initial running issues.

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Old 08-23-2016, 02:33 PM
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Join Date: Jan 2009
Location: IL / WI
Posts: 970
What to do when my M103 is giving me trouble: A beginners guide ~ Artisan

Lakemoor, IL
Artisan Motorenbau
Chicagoland Mercedes Enthusiast Facebook Group:
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