m103 stalling at idle. hard to start afterwards... - PeachParts Mercedes-Benz Forum

JamesDean · #1 11-13-2007, 12:25 PM

so, i havent driven the 2.6 since friday, 3 day weekend and pretty much just slept it all away..and watched south park..anyway

started up fine and everything, like it usually does but soon as I got to the second red light the rpms dropped below 500 and the engine stalled out completely. So I hopped it into P and started it back up..and drove making sure not to let the idle drop to 500, so that meant popping it in Neutral at every stop light, using two feet and keeping the rev up. Let me tell you was not fun..

So I got to the end of the freeway (another red light) (btw: the car performed great on the highway engine wasn't at all bothered by anything, acceleration was there..everything) but I got to the red light and it stalled out, so I hopped it back into P and tried to crank it over...yeah I was cranking there for a good 2-3 minutes before it kicked. It wanted to a few times but just fell on is face..

A brief search on here hints at a vacuum issue / ovp / idle control stuff...My first suspicious (always the biggest and worst item) was the head, but after the highway drive i dont think that its the head.

So I am gonna magically limp it up to the shop today and see whats up...I've heard that if you pull the OVP that the engine will revert to mechanical injection? Maybe I'll do that? Not sure maybe that was just on the KE Jetronic stuff not the CIS-E.

-Kris

david s poole · #2 11-13-2007, 05:57 PM

check the crank pickup sensor to the ignition unit they can give you that kind of screwy day.

ps2cho · #3 11-13-2007, 07:14 PM

My 300TE used to stall when idling sometimes. New OVP fixed that. I would first change that. But before changing check the condition and fuses (its located by the battery behind the plastic guard.

JamesDean · #4 11-14-2007, 12:35 AM

If I were a betting man..i'd say the OVP.

but...since its the cheapest part of what *might* be wrong, its probably OK and working fine.

I drove it up to the shop, I got there, had my buddy go get the one mech to watch it stall out...and guess what it did..

yeah didnt stall out at all. sat there and idled fine.

im sure that means somthing somehow..but i left it up there overnight and we'll see in the morning when its cold what it does.

:: crosses fingers :: something relatively cheap and easy to fix!

when is it ever easy and cheap? lol

anthonyb · #5 11-14-2007, 01:51 AM

Also check the fuel pump relay. Actually, when it fails to start, check to see if the fuel pump is energizing for a second or so when you turn the ignition to "on." If it isn't, the relay isn't sending power to the fuel pump and it's faulty.

Sometimes the relay fails intermittently - my 300E had this problem a few years ago, and it would come and go. A new fuel pump relay and it hasn't done the same thing since.