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  #1  
Old 12-06-2008, 09:42 PM
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jeepnut7261
 
Join Date: Dec 2008
Location: Surprise, az
Posts: 8
85 500 sel will not start.

OK, my first MB. But I am a fair shadetree mechanic. After much researching of these very helpful forums, I can say I have fuel flow, I have spark. It cranks very well, but will not run.
To be specific, I can loosen a fuel rail and I get gas leaking out. I have even sprayed starting fluid into the intake.
I have spark, I tested the coil, and it had very high resistance across the primary coil, and color of spark went from pale yellow to bright blue, and will arc across an inch of gap.
I have replaced the cap and rotor, and have even tried rotating the distributor as I crank it over to see if I can get any bang, no change.
I am really puzzled, and I don't want to just throw parts at it and hope to get lucky.

Thank you for taking the time to read this, and for any help.


Mike

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Old 12-07-2008, 12:46 AM
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Location: Surprise, az
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SO could the problem be the ignition control module?
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Old 12-08-2008, 10:43 PM
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So no ideas, huh?
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Old 12-09-2008, 05:43 PM
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Location: Tucson, AZ
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Do a compression test. Also have someone crank the engine while you check the timing marks. That should get you an idea if the timing events are near what they should be.

Karl M.

85 500SEL
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  #5  
Old 12-09-2008, 07:36 PM
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try to check the Ignition Control Module. Failing ICMs can spark but not at the right time. Personally, I would also test the coil, due to the mileage and age of the car.
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Old 12-09-2008, 09:55 PM
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jeepnut7261
 
Join Date: Dec 2008
Location: Surprise, az
Posts: 8
Coil tested bad, replaced it. New cap and rotor, wires look pretty new.
Have fuel.
How do you test the ignition control unit? Or even the crank position sensor?

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