Hard Starting 1992 300E

[Gilles Kay]

1992 300E with 130,000 miles and M103 engine. Car takes a long cranking time when cold to start and will finally smooth out idle after about 30 seconds. Also starts a little hard after sitting a while when warm. Installed new injectors about 2000 miles ago, but suspect one or more of the injectors may not be working properly. How do you diagnose, without the special fuel pressure tools, which side of the fuel system may be the problem? I know there is a fuel accumulator next to the fuel pumps which keeps the fuel system primed after shutdown and the fuel injectors are supposed to keep fuel pressure on the other side of the injection system. How can you check the accumulator or the individual injectors to isolate the problems? Thanks for any help with this problem.