Date registered: Jul 2006
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Changed fuel distributor, car won't start.
I am looking for any advice on how to get to a starting point with idle screw and the idle mixture adjustment to get the car running again.
I have a 1976 450sl. After working on this car for quite some time I got it running however it did not seem to have the power it should and would sound like it was missing a tiny bit at idle. When trying to go up a slight hill it would almost stop, but running on city streets it was ok. I was able to set the timing at 5 btdc and the idle did hold between 7 - 8k. The previous owner told me that his mechanic said that it needed a fuel distributor so i picked one up and decided to put it on the car. We put it on today and tried to start the car. No luck. We played with the idle screw and the 3mm hex screw adjustment next to the fuel distributor but still could not get it started. ( I did notice that the plate next to the hex screw is very hard to push down. Don't remember it being like that before.)
Could anyone tell me how to put these two adjustments back to a general starting place?
Right now I don't know where to go next to start to get the car started again.
I have replaced distributor, wires, rotor, coil, all sensors, all vacuum fittings and hoses, all belts, k&n air filter, alt. brushes, rubber boots under intake manifold, rubber hose on throttle plate, injector oring and seals, injectors have been sent away for cleaning and insuring that they are opening within spec of each other, set timing, set idle (to information plate by radiator), timing chain, rails, timing chain tensioner, put on 73 exhaust manifold,
cleaned every connector and electrical joining point, new battery, fuel tank removed and re surfaced, all new rubber fuel line from tank to fuel distributor, distributor advance and retard mechanism checked for correct operation, all vacuum actuators for locking system replaced and locking system works good. I've done more but i think this is all that may pertain to my problem.
One other thing. The replaced fuel distributor is not brand new but I was told that it is in working order. The car was idling and running fine (lest low power and slight lope) then it
developed a condition where it will not accelerate beyond 1400 rpm. Beyond 1400 rpm the engine bogs down and acts like it is going to cut off. This was the last problem before replacing fuel distributor.
Thanks in advance for any help you can give.