M104 shuts down when hot - PeachParts Mercedes-Benz Forum

usaustria · #1 12-08-2003, 09:21 AM

my 60k mls 1994 320 coupe automatic tranny starts fine when cold. but when restarting with engine still hot i experience the following condition: engine starts up normal. i put the tranny into D or R still normal. but when i try to get out of a parking lot and step on the accelerator only briefly followed by breaking, the engine stumbles and dies. after ca 100 yards the condition goes away and engine runs properly.
following parts were changed recently
engine harness,
3 ignition coils,
plugs,
plug connectors,
OVP resoldered

any ideas and suggetions highly appreciated

greetings

reinhard

Benzmac · #2 12-08-2003, 08:13 PM

There is NO such thing as re-soldering an OVP relay. They often times fail internally or at the contacts and can't be repaired.

First replace it, then look further.

They almost always fail when hot.

usaustria · #3 12-10-2003, 11:02 AM

thank you benmac!
will swap OVP with a friend's newly acquired T320. hope this will take care of stalling condition.
regards
reinhard

usaustria · #4 12-30-2003, 03:41 AM

is ovp 201-540-37-45 interchangeable with 000-540-67-45???
thx,
reinhard

usaustria · #5 03-22-2004, 06:42 AM

today I insstalled the updated OVP- problem remained the unchanged. maybe another hint: before stalling occours the engine will catch on with what I best can describe as a thump instead smooth cranking and just catching on. wirering harness, coils, connectors have already beed replaced. where to look next??????
thx,
reinhard

usaustria · #6 03-29-2004, 11:13 AM

Uuuuuuuuuuupp!!!!!!!!!!!!
Anyone please............
Thx,
reinhard

MrCjames · #7 03-29-2004, 02:22 PM

The throttle actuator may be the culprit, have you had the vehicle scanned for DTC's? If so, was there a DTC that referenced Fuel Safety Shutoff? Another relatively common problem on that era of vehicle is the throttle actuator, I encourage having more test's performed before making that expensive guess.