Hello! Thank god for you guys whoever you are. My 89 300e has been idlenig low and not wanting to start for a few days now. I was just on the phone with a local mb parts dealer looking for a cold start valve when I came across this thread. Like I said all the symptoms look to me like it could be the ovp. However I have seen some threads that have said it could be the cold start valve. I am ready to fix the problem. Any help would be great!!!!