I dont know what to do anymore. I replaced every part I could think. New fuel injectors and seals, new fuel accumulator, fuel pump, fuel filter, spark plugs, distributor, wires, warm up regulator and I still have hard start problem on my 1979 mercedes 450 slc. When car is cold its start perfect but after its get hot and I shut of engine for 10 minutes its takes 3-4 long cranking until its start again. When car is hot and I crank it in the begining of cranking for one second it seems car wanna start and after that its just cranking while I accelerate to the floor. When I replaced warm up regulator I find out that vakum line on the fuel pressure damper is broken. I took fuel pressure damper out and I suck on that vakum line and it was a lot og fuel there. I dont know is it normal and also I dont know what it purpose of that vakum line. Also I blowed thry the fuel lines of fuel pressure damper and it was no resistance at all. I dont know if that is normal. Anyway I ordered new fuel pressure damper)
I am not sure is it vapor lock problem or it is something with ignition. Also there is vakum leak in my car because after i shut of engine and lock a car passenger door lock but after one minut if i try to unlock only driver door unlock. So I am not sure if vakum has to do a lot with hard start problem. Also I am thinking that maybe is something with ignition because like i said firs second of starting it seems its wanna start but after that it seems its floded.
Injectors are new so the only thing I can think of would be leaking cold start valve.Please help I am geting broke replacing all this parts and nothing hapens.

Wo, wo, wo, hold your horses. You've managed to pile in way too many topics into one email.

Firstly, central locking is not connected to the fuel injection.

If I understand you correctly you have a hotstarting problem. Does the engine run alright once it has cleared its throat? I assume that it has.

You made a mistake by going around and replacing all those components. The first task would have been to diagnose what is the problem. Also, do not assume that the replacement component is working correctly until its proven to.

I assume you are doing the work yourself. First thing you MUST do is have a fuel pressure tester for CIS. Connect it in the line between the damper and the warm up compensator. Then there's a detailed procedure which another list member has sent me for diagnosing the system. A similar procedure is also on the MBUSA Service Manual CD. BUT, IT REQUIRES A FUEL PRESSURE TESTER. You may have the wrong warm up compensator as I believe there were two different designs which outwardly look identical.

I recently fixed my hotstarting problem on a '77 6.9 at a cost of equivalent to $35 because I actually found the compoent which was causing the leak.

Sort out your hotstarting before looking at the ignition issues. Once you know that your system is holding pressure you can start checking other bits. But if the car runs normally most of the time and always starts ok from cold then you need to sort out the CIS first.

Adam

BO79450SLC,

You replaced a lot of costly parts, but you still seem to be leaking-down fuel pressure.

Did you also replace the $20, or so, fuel pressure check valve at the fuel pump?

Mark Shinnick
www.mastertimer.com