450 SL in Denmark

Hi Peter,

looking at spark plugs, your injectors in 2, 5, 8 are from 3 different groups. So it cannot be ECU. Pressure loss test was done. That should exclude valve shafts and oil rings as well. Have you done a cleaning test of injectors and have you verified ground connections of injectors?

Thanks, Volker.

The wiring harness is new, but I will check the grounding connections to be on the safe side. I will also try to find someone in DK who can clean the injectors professionally.

Have you any experience with the solonoid in the injectors going bad, so that the injector does not close fast enough? - meaning that it continues to spray even if the signal is no longer there?

Best, Peter

Hi Peter,

well injectors can clog and normally that blocks them. But sometimes needle is fixed in a way that it cannot close and leaks permanently.

and if it is the injector, the problem should wander to next cylinder if you swap injectors.

Hi Volker,

With the compression test done and showing encouraging results I couldn't leave the uncertainty about manifold vacuum. I have purchased a proper vacuum gauge with glycerin and it now shows 560 mBar at hot idle. That gives me peace of mind. The engine still runs rich and somewhat uneven, so next up are the injectors.
 


Best, Peter