1975 350SLC rebirth

Dear Volker,

No I do not know their test protocol.

I sent the ECU to SL Shop

I tested the fuel pressure at the cold start unit, it was 2.05 bar

The car has not actually started... It kind of ran when spraying carburettor cleaner in the intake.

I think I need to check the injectors...

Jean Pierre

Hi,

that does not seem to make too much sense to me if someone tests an ECU without telling what they tested. Anyhow you seem to have another problem you should find. You can try with 3V whether your injectors tick and spray when you apply them short time with fuel pressure present.

Dear Volker,

The engine runs now.... on 3 cylinders! 5 injectors are stuck, all 8 have continuity when tested with 3 volts, but only 3 click. Those 3 spray reasonably well.
I will try and get them cleaned tomorrow, let's hope!
I have a spare W116 450 engine but I can't use its blue injectors, mine are yellow...

Jean-Pierre

Dear Volker,

Good news, the engine is now running on 8 cyinders, the injectors responded well to cleaning... I have not driven it et, but soon I will. I am sending it to have a stainless steel complete exhaust made, the original one is in ruins...
Thanks very much for all the information and support, I could not have done it without it!
By the way do you know about FJ119 injectors fron Standard? It appears they would be a suitable replacement... At about $70 each brand new.

Jean-Pierre

Hi Jean-Pierre,

forget them.

Dear Volker,

I have had a new stainless steel exhaust made for the car, so I had a chance to run it more...

It starts quite well but then it runs very much too rich, a lot of black smoke from the exhaust, and you have to give it a lot of throttle to prevent stalling.

I checked the cold start injector, it comes on when cranking,but does not stay on. I tried disconnecting it but the issue remains.

All the sensor values checked previously were within tolerance, the ECU was checked and passed...

Could it be that the injectors are flowing too much petrol? They are the correct yellow ones that I got cleaned, maybe the process damaged them?

What else could cause this problem that I should check?

Best regards,

Jean Pierre