I bought a '65 230sl a couple of years ago, and it showed what I thought were symptoms of bad fuel injectors (poor throttle response, burbling in exhaust, and black exhaust pipe). I pulled the injectors and tested them with the testing device that Mercedes Source sells. Only one of the injectors atomized correctly, and all failed to hold pressure. I replaced the injectors, which led to difficulty in keeping the car idling. I did the linkage tour and set the air and fuel mixture up to idle smoothly.
I am now struggling with a car that hesitates/lacks power under load once warmed up. I have checked the timing and have 10 degrees at idle with vacuum line removed from distributor, and 30 degrees of timing at 3,000 rpm. Dwell is 41, which is a little high.
I have also replaced the fuel filter and blew air through the fuel return line to make sure that it isn't clogged. I was thinking this might be part of the problem because my car registers empty, and I am only able to put in about 6 gallons of gas. So I don't know if that is a separate issue with the sending unit...
The car seems to run fine while the engine is still cold, but once it is warm it really struggles with power. I have checked the warm running device, and it has strong air flow when cold, and almost no air flow when the engine is warm. I have even tried to remove the WRD air filter, and put a bolt in once the engine is warm to make sure that there is no air going in. It doesn't make a difference...
Any help would be much appreciated. Should I adjust the timing to 38 degrees at 3,000 rpm? Do I have a fuel flow issue?
