Please help! So far nobody is 100% certain what is actually the problem and
it seems rather stupid to change parts one by one till I get to a solution
becouse Mercedes dealer is very expensive with suggestions. If anyone has
any experiences with '93 E320 coupe shuting down occasionally during running
at idle when shifter is in "D" position? Sometimes it also happens when
shifter is in "P" or "N" positions. Otherwise car runs perfectly and has
full power. It has only 70000 miles on and was parked for the last two
years. Once more I emphasize that car can be driven wich ever way you prefer
but when you're making a full stop on the crossroad and shifter is in "D"
engine idles eratically or shuts down. Any clues?
OVP relay check .. 000 540 52 45
changed to 000 540 67 45
See if this part has been upgraded.
Your car has access to codes under the hood
Check the codes if you want specific possible fault conditions of the engine
ECU management system.
same thing happened to my 1990 300e..every once in a while it would stall at
a stop sign or light just after i bought it ..the difference is after
sitting for a few days my carit would turn over sluggish..........so i
checked the voltage regulator which looked fine but i replaced it
anyhow...........same thing............replaced the battery in the car and
haven`t had the problem in 5 months.
This also seems like a good theory for a car which sat for couple of years.
Basically the battery could be marginal, and since at an idle the
alternator isn't putting out that much juice, the battery could be
driving the system into a low voltage state which causes all of the
electronic whoohaws (technical term) to get edgy.
You could measure the idle voltage with a voltmeter, or just try
swapping in a new battery.
The car has biodegradable engine wiring harness - it may cause very strange
and hard-to-diagnose symptoms. Now that the car is over ten years old, the
wiring insulation begins to crack and cause shorting. The mechanics who know
this issue won't even start diagnosing the car unless the original harness
has been replaced. Check the wires going to the idle control valve (throttle
actuator). It's also possible that there's another (than wiring) problem
with this part, a stuck sensor etc.
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