1973 450SL D-Jet Frustration

Hi Norbert,

I have previously cleaned the acceleration impulse generator at the throttle body this works well - I can make the car drive by "cycling" the accelerator forcing the system to inject fuel! Not practical though..

You also make a good point about removing the spark plugs - I should have thought of this. Again, I'll do this tomorrow when I'm allowed to get upset with the car.

Do you still have copies of your tool available to buy? If so I would like to buy one from you. Finding reliable machinists here is difficult as they are a dying trade, victims of an over-inflated property market.

Jeff

Hi Jeff,

you will find timing data in our workshop manual in chapter 07.5-500 . You have to adjust according to your distributor no. That should be 5° after TDC and then verify the rest of the table.

wrote:

...
Do you still have copies of your tool available to buy? If so I would like to buy one from you. Finding reliable machinists here is difficult as they are a dying trade, victims of an over-inflated property market.

Jeff
 

Hi Jeff,
I still always have a little stock of ready produced tools and can ship to the U.S.A. again.
But shipment has become the more expensive part of the deal and I can't say how long shipment will last.

Please read the PM I will send you.

Best Regards
Norbert

Hi Volker, Norbert,

I have carried out the tests as per the compendium on the connector at the ECU. Everything seems to be within reasonable tollerances:

 - 1 - Air temp sensor = 277 Ohm @ around 20 deg C.
 - 3, 4, 5, 6 - Output for injectors = 1.5 Ohm each
 - 7 - MAP primary = 90 Ohm
 - 8 - MAP secondary = 335 Ohm
 - 9 - Acceleration switch good
 - 13, 14, 21, 22 - Trigger point good
 - 17 - Idle switch = good
 - 20 - Acceleration switch good
 - 23 - Coolant temp. sensor = 2.4 Ohm @ around 20 deg C.

This to me seems to support the idea that there is a fault in the ECU "run" circuit, as the idle circuit seems to be fine. 

I do now need to reset the distributor and sort the timing. To be continued...

Hi Jeff,

and please do not forget the cap on MAP sensor. I have not seen a single MAP sensor on a 450 engine from the US which was not detuned since many years now.

Yes! Thanks for reminding me. I will check this morning. What am I looking for? That it is removed or something else?

Jeff