llebyat

Hi all

I have a 1987 w126 300se think M103 engine with a cold start problem which is just getting worse and worse.

The engine just turns over and over and over and then spluters into a missing start, then runs lke a dream once started. Following that the stating improves and when hot it starts as it should do.

Is there some sort of cold start sensor? I know there is a sensor on the top of the engine block at the rear which was replaced about 1000miles ago due to the car cutting out at juctions or stalling when hot which sorted that probelm, then this one has started?

Help apprecated

Blackfield

I have a very similar problem. My car has only 79k miles on it. Someone help us please.

thanks

johnathan1

I also have a similar problem with my 89 300SEL... I started a thread over on Mercedes Shop forums:

http://www.mercedesshop.com/shopforu...d.php?t=213705

Untertürkheim

There is a temp sensor, mine was bad on my 560SEC, and it would cause a hard cold start since it controls the "choke" or richness.

Are all other items on the cars in order, cap& rotor, wires and plugs, O2 sensor?

Also, has/have the intake manifold and the injectors been checked for vaccum leaks? The injector seals or the injectors themselves may be the cause, although the injectors are less likely since the cars run well once warm.

One thing that may be hard to diagnose is whether this is a time or temperature sensitive issue. Time would probably be a vaccum issue, temp would be a sensor, but could also be vaccum.

jonnyoutram

i also have the same problem, 500 sec '84