76 300d trans issues - Mercedes-Benz Forum

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post #1 of 36 (permalink) Old 06-02-2011, 10:02 PM Thread Starter
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76 300d trans issues

So i have the car running, but the car wont shut off with the key off and out. I know this is a vacuum issue, but i dont think this is going to affect this transmission because it is converted to electronic? This is what the PO told me and its what i am seeing, no vacuum lines and only wires leading to the trans

The symptoms are delayed 1-2 shift and no shift after that . It goes into reverse just fine.

I just need some help trouble shooting this thing.
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post #2 of 36 (permalink) Old 06-03-2011, 12:52 AM
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Research the function of the bowden cable, and how to adjust. The bowden cable kind of acts like a throttle position sensor, to tell the tranny when to shift. That may cause a late shift, or weird shift timing. A tranny filter might help also.
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post #3 of 36 (permalink) Old 06-03-2011, 04:52 AM
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A original 300D transmission is controlled by a single rod, connected to the gas linkage. It starts in second gear, unless you are in L or when you use the kickdown.

If the transmission is replaced or converted, you are on your own.
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post #4 of 36 (permalink) Old 06-03-2011, 02:43 PM Thread Starter
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A original 300D transmission is controlled by a single rod, connected to the gas linkage. It starts in second gear, unless you are in L or when you use the kickdown.

If the transmission is replaced or converted, you are on your own.
I cant figure out how the trans is controlled. I dont see any obvious rods or cables other than the speedometer cable going to and from the transmission. I discovered that the car will shift all the way up to third but it had to red line every shift, i didnt attempt to go into fourth because of the speed limit and limited space.

There is definitely something out of adjustment.
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post #5 of 36 (permalink) Old 06-03-2011, 03:10 PM
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It could also be that the kickdown switch is stuck, it produces the same effect. Disconnect the plug on top of the kickdown switch under the accelerator pedal and see if that changes things.

The rod is probably under the air filter and runs passed the starter. See the picture below. It is a 240D engine, but I think the rod is the same for the 300D.



If the rod is stuck in the full-load position, it can also produce delayed shifts.
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post #6 of 36 (permalink) Old 06-03-2011, 06:14 PM Thread Starter
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It could also be that the kickdown switch is stuck, it produces the same effect. Disconnect the plug on top of the kickdown switch under the accelerator pedal and see if that changes things.

The rod is probably under the air filter and runs passed the starter. See the picture below. It is a 240D engine, but I think the rod is the same for the 300D.



If the rod is stuck in the full-load position, it can also produce delayed shifts.
Well... There is no rod there on mine, just a single wire.

Just kidding, but i have a different issue preventing me from driving the car at all. The alternator is not charging the battery. The red battery light is staying on key on or off and out.
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post #7 of 36 (permalink) Old 06-04-2011, 09:52 AM
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Search around, you should find someone that will rebuild the alternator locally, if you live in a good-sized city area. I was able to get mine rebuilt for $80.00 here in about 6 hours, while a new / remanufactured would have cost twice that or the reman, and 4 times for the new.

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post #8 of 36 (permalink) Old 06-04-2011, 02:08 PM
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Well... There is no rod there on mine, just a single wire.
If it has a wire, it is not an original transmission. Can you locate the transmission number? It should start with 722. It is on the transmission just above the oil pan on the passenger's side (in the picture below the two round things on the side of the transmission).
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post #9 of 36 (permalink) Old 06-05-2011, 12:11 PM Thread Starter
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If it has a wire, it is not an original transmission. Can you locate the transmission number? It should start with 722. It is on the transmission just above the oil pan on the passenger's side (in the picture below the two round things on the side of the transmission).
Alright then. Ya every thing is appearing to be congruent with what i was told by the PO. The trans has been replaced and is electronic.

The transmission number is a long one, 1232703101722 118 02 098619

I really appreciate the help and guidance.
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post #10 of 36 (permalink) Old 06-05-2011, 12:23 PM Thread Starter
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I drove the car up a long road the other day hoping to see it shift into fourth but it didnt seem to take. I was wondering if these thing are reving really high at 55-65 mph?
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