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  #1  
Old 01-04-2010, 10:12 PM
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79 280CE w123 fuel injected six starts then stops

When key switch turned to start, engine fires/starts, but as soon as I release key to run, it stops immediately. (If I hold key in start, engine stays running, but not good for a engaged starter dragging along!) Could it be the ignition switch, or am I missing a bad relay/module under the hood? I already pulled the electric half of switch out, but no way of testing. I have all of the service manuals, and looked at the ignition wiring diagram as well as the complete electrical diagram. Any thoughts, or has anyone had this problem? Thanks for your help, Al.
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  #2  
Old 01-04-2010, 10:22 PM
79Mercy's Avatar
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To me it sounds like the fuel pump relay or the ignition.

After you release the key from the starter position does it return to the correct spot?

Post some pictures of your 280CE, we'd love to see it.
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #3  
Old 01-05-2010, 11:43 PM
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Location: South Dakota
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Is there a start and separate "run" resister on this one? The "run" one may be disconnected or bad. It's either fuel or fire.

Sparky
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  #4  
Old 01-06-2010, 06:35 AM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 32,357
Quote:
Originally Posted by 79Mercy View Post
To me it sounds like the fuel pump relay or the ignition.

After you release the key from the starter position does it return to the correct spot?

Post some pictures of your 280CE, we'd love to see it.
That fixed my 280 doing the same thing.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins& six speed; I have had about 35 benzes. I am finishing a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual....I also have a 427 Cobra replica with an aluminum chassis.
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  #5  
Old 01-06-2010, 03:28 PM
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Quote:
Originally Posted by gs sparhawk View Post
Is there a start and separate "run" resister on this one? The "run" one may be disconnected or bad. It's either fuel or fire.

Sparky
Yes, my 79 280CE does have two resistors. When I'm holding switch in start position, engine stays running(fuel and ignition) so why when I release key to run it stops? Key position does go back to run position. Seems like the switch, but could it be one of the changeover relays? Thanks, Al.
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  #6  
Old 01-06-2010, 03:34 PM
79Mercy's Avatar
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Join Date: Mar 2008
Location: Florida
Posts: 4,128
Those are ballast resistors(they take 12V and turn it into about 6V releasing heat energy) for the ignition system pretty sure the ignition switch doesn't have anything to do with those.

To me it sounds like a ignition switch issue, but lets have someone elses opinion first.
__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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