downseycool

hi folks,

recently GEDagget has posted about a prob with his merc, and i have followed it with interest cos i have exactly the same problem with mine. Which is that for no apparent reason and with no warning my car just cuts out, dead, one minute running fine the next dead nothing. I noticed that at the same time as she cut out i could not hear the fuel pump running, which is quite noisy and easily audible. Anyway after a while of just sitting there and flicking the ignition key eventually the pump can be heard running and off i go until the next time.

researching the problem on this forum and elsewhere i came to the conclusion, after cleaning the fuel pump relay contacts and still having no luck, that i should replace said relay. You know where i am going with this, still she cuts out randomly, so i am at a complete loss. can anyone point as to where else to start looking.

thanks in anticipation.

chris.

ps : she is an 89 200e

RPB

Check wire harnesses and potentially clogged fuel filter... Unfortunately could be a few things, any check lights on?

ptoro01

I've seen a faulty temperature sensor send the wrong signal to the ecu and cause said problems. Test the resistance specs, if its not within range, the signal it sends is the same as if the engine was way overheated and the automatic safety cutoffs are set into motion.

autounion

I Had a similar problem many years ago, after LOTS of tech visits and part changes, the altitude sensor was the culprit. It thought it was in the mountains or when it wasn't - caused many dramas.

jflebotte

Had the exact same problem last summer with my 87 300E, turned out it was a fried rotor and distributor cap. Check that out before any other costly repairs are made. Once I replaced mine it ran like a gem again.

downseycool

Thanks for the pointers guys, very appreciated, ill have a go at a few of them and get back to you with any useful info i may stumble across.