Engine stalls sometimes while driving in 1990 300TE - PeachParts Mercedes-Benz Forum

duchamp · #1 07-01-2019, 12:09 PM

About 4 times a year my W124 stalls while driving, almost always when coming to a stop or parking.

It cuts with no warning and all the dashboard warning lights come on, as if I had turned the key. Usually I can't tell it stalled except for the lights.

I know it could be the OVP, and I remember that there is another part that delivers electrical power that has brushes that wear down, but I can't remember what that is called, it's not the alternator.

lsmalley · #2 07-01-2019, 04:46 PM

Start from post #24 onward. EHA valve

systematic testing of fuel components

porkface · #3 07-01-2019, 05:23 PM

there's a speed sensor in the back of the speedo that feeds the fuel system. always a stall at stop, always restarts. used to do them once a month in the late 80's.

pawoSD · #4 07-02-2019, 04:56 PM

Wow, I wish I had known that when chasing the same issue on my 300E 7 years ago.....it used to do it when coming to a stop, or sometimes when coasting through a turn.....more like 4 times a week than per year.....ended up trading it.

duchamp · #5 07-02-2019, 06:13 PM

Thanks, can you give me more info about what it is properly called? A google search turned up several different speed sensors.

porkface · #6 07-02-2019, 06:53 PM

007 542 29 17. nla from mb.

altezza · #7 07-03-2019, 04:17 AM

Quote:

Originally Posted by duchamp

About 4 times a year my W124 stalls while driving, almost always when coming to a stop or parking.

It cuts with no warning and all the dashboard warning lights come on, as if I had turned the key. Usually I can't tell it stalled except for the lights.

I know it could be the OVP, and I remember that there is another part that delivers electrical power that has brushes that wear down, but I can't remember what that is called, it's not the alternator.

M103 Airflow Potentiometer wear.

nulu · #8 07-03-2019, 02:51 PM

The part your thinking about is in the alternator, the voltage regulator

duchamp · #9 07-03-2019, 04:23 PM

Thanks!

Ferdman · #10 07-05-2019, 05:51 AM

duchamp, when was the fuel filter replaced last? That could be your problem. Fuel filters should be replaced every 60,000 miles in that vintage automobile.

ds190 · #11 07-10-2019, 02:02 PM

You mentioned OVP- did you replace it? If you don't know it's history, buy a new one

The 103 engine is really picky about electrical charge, and I'd replace the voltage regulator too.

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