My 1990 190E 2.6 will try to start everytime you turn the key, however, only about 10% of the time will it stay running. As you turn the key to start position it attempts to start then immediatley dies. After returning the key to the off position and them making a second attempt it will start fine and remain runing no problem.
I did a search and did several small things. New coil, plug wires, plugs ( standard Bosch- not platinum), new rotor and cap. New oil change and have dumped in a bottle of Techron to clean our engine deposits.
Still, rarely stays running first try. Almost never dies second aattempt. Could this have something to do the cold start valve? I need advice...I have run out of option

__________________
Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red