1972 Mercedes 280se 3.5 V8 warm-up rough running

[Stoive47]

Hi
Help please any D-Jetronic experts -

My old Merc has just developed this fault . It starts fine and runs and accelerates smoothly for the first 10 minutes of running . Then it starts to run really rough , and if you don't blip the throttle it just conks out .
If you do blip the throttle it keeps running but really roughly . Also there is a strong smell of unburned fuel from the exhaust .

I've checked all hoses and wires and all seem ok .

Any ideas please ?

[bob1179]

Check the rotor arm and distributor, from previous experience, if these are worn it can cause poor running.

[bstark]

I'd also add condensor and plug leads to that list. Sounds like something electrical breaking down under heat. Especially if the symptoms are repeatable and consistent.

[Stoive47]

Thanks guys

[skirk]

Check....fuel pressure..... cold start valve...auxiliary air valve and aux trigger points ( these are low down in the distributor and "trigger" the injectors...

[trickywoo]

I'd echo the electrical side of things first.

[H4r1s]

check the injection trigger points under the distributor also.

http://www.benzworld.org/forums/r-c107-sl-slc-clas...