Originally Posted by 500SEL

had this problem recently, when it stalls, sometimes it starts right up and others it takes a while....

changed fuel pump relay....



also changed ICU....but it didn't start today....

so I put old ICU , it started....

then shut it off, and try to restart, wont start

so put the new ICU again and it started.....

maybe my connections to ICU are bad????

could it be bad coil?

I don't know how to diagnose further

Thanks