hang in there dude, i am working the same issue on my 300e. i WILL fiqure it out and i WILL post my results. i have asked that same question on this forum since i joined with little results. but i am close to a cure. mine is hard start cold and difficult start hot. i suspect leaking injectors and bad cold start switch. we will see very soon.
hang in there dude, i am working the same issue on my 300e. i WILL fiqure it out and i WILL post my results. i have asked that same question on this forum since i joined with little results. but i am close to a cure. mine is hard start cold and difficult start hot. i suspect leaking injectors and bad cold start switch. we will see very soon.
glad to see I am not alone in this problem. I turned my car into the mechanic,...keeping my fingers crossed it will be a simple fix and I won't have to drop the car.
I'm going to say its your cold start valve. But I would check the CIS temp sensor, on top of the engine, first to see if its sending the correct temperature signal to the CIS for it to fire the cold start valve.
to test the cold start valve, simply apply 12 volts and a ground to the 2 little prongs at the cold start valve. i know its tight. it does not matter which one you make the posi/neg. touch the wires to the battery and with the engine off you should hear it click when voltage is applied. now, to check and see if it is actually spraying in fuel, start the car and while its running touch your test wires to the batt. and if its doing right the engine will flood/load up. you can mistake it if it is working. i actually used an extra cold start wire from a parts car to make my test wire. those little prongs are hard to hook up to.
to test the cold start valve, simply apply 12 volts and a ground to the 2 little prongs at the cold start valve. i know its tight. it does not matter which one you make the posi/neg. touch the wires to the battery and with the engine off you should hear it click when voltage is applied. now, to check and see if it is actually spraying in fuel, start the car and while its running touch your test wires to the batt. and if its doing right the engine will flood/load up. you can mistake it if it is working. i actually used an extra cold start wire from a parts car to make my test wire. those little prongs are hard to hook up to.
Wow, I didn't know you could test the CSV that way! The only way I thought was to just remove it, leave it hooked up and hold it over a cup while cranking the engine at cold temps. It should spray fuel, but not leak after starting.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Mercedes-Benz Forum
7.6M posts
693.6K members
Since 1999
BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more!