1977 280SE throttle not opening - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 02-24-2014, 07:45 PM Thread Starter
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1977 280SE throttle not opening

The car will not start. I noticed that the throttle does not open when the gas pedal is depressed.

Also is this fuel injected and does it have a computer? Is the fuel pump electric or mechanical, I cannot find the fuse?

Thanks just got the car.

Last edited by Dayminder; 02-24-2014 at 09:02 PM.
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post #2 of 6 (permalink) Old 02-25-2014, 07:03 AM
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It is a K jetronic system that is electromechanical with an ECU. What you're looking at is the fuel distributor injection plate that is not tied to the throttle, air going past it opens it and causes the fuel distributor to send more fuel to the injectors. Check the pump in the back, under the car right outside the tank.
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post #3 of 6 (permalink) Old 02-26-2014, 09:08 PM
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1977 280SE throttle not opening

Quote:
Originally Posted by unimoged View Post
It is a K jetronic system that is electromechanical with an ECU. What you're looking at is the fuel distributor injection plate that is not tied to the throttle, air going past it opens it and causes the fuel distributor to send more fuel to the injectors. Check the pump in the back, under the car right outside the tank.



I don't think the basic k-jet system has an ECU. The earlier d-jet does, and there is something in the KE-jet too, but in 77, I'm pretty confident it would either be carbed or a simple k-jet for the fuel management system.


Edit: and I believe the "e" in 280se represents a fuel injected car, but I'm not sure.
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post #4 of 6 (permalink) Old 03-01-2014, 05:27 PM Thread Starter
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How does air get into the engine, where is the throttle if that is the fuel injection plate?
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post #5 of 6 (permalink) Old 03-02-2014, 10:20 AM
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post #6 of 6 (permalink) Old 03-02-2014, 10:52 AM
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Quote:
Originally Posted by unimoged View Post
It is a K jetronic system that is electromechanical with an ECU. What you're looking at is the fuel distributor injection plate that is not tied to the throttle, air going past it opens it and causes the fuel distributor to send more fuel to the injectors. Check the pump in the back, under the car right outside the tank.
The only things correct about that statement are the last sentence and the words K-Jetronic. Everything else is slightly off. Firstly, there's no ECU. Secondly, the throttle plate in front of the fuel distributor is absolutely tied to the gas pedal. Sounds to me like it's simply stuck, that is to say, either the throttle plate itself is stuck or the linkage is stuck (the latter is more likely, in my opinion).

Now, as to the no-start condition. Yes, the fuel pump is right behind the right rear wheel, in a housing together with the fuel filter. With an assistant working the ignition switch, get under there and listen for the pump to whir and/or feel for it vibrating. If neither is taking place, check for voltage at the pump terminals. If there's voltage, the pump itself has failed, if not, proceed further "upstream". Now your suspects are the fuel pump relay and the ignition switch. The fuel pump relay is pretty inexpensive.

So, check the throttle linkage for free movement, the check the pump and report back.

Also, we have a dedicated W116 forum.

Felicita e un bicchiere di vino con un panino.
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