First time here glad to find this site, I have owned my 94 C280 for about 4 months love the car until lately, will just stall out of the blue, I have loss of accelleration first, asr light comes on , and about five second later it dies than won't retart for about five minutes, after that sometimes asr light comes on and stays on, car seems to stall more and more frequently now, just spent $600 having air mass sensor replaced, didn't help, mechanic than told me I should spray slider linkage maybe sticking, or may need to be replaced, said that was big bucks also said could be because of brand of gasoline (mobil) I used, have been reading threads and think I need to check ovp & fuel pump relays, where are they located on my car, in trunk or up front. thanks in advance for response

if im not mistaken, trunk location on W202. next to battery.

a search on "OVP" will return a boatload of info. possibly hard to sift thru, but a ton of info beats the s#it out of no info at hand.

I had a similar problem caused by moisture trapped in the fuel pump relay, but my car is 18 years old

xp

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1985 190E 2.3L - a constant project.

Did you cure your Mercedes stalling ?
If so, what was it ??

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Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles

I believe there is a single relay contolling both functions on the C280. Don't know where it is though (behind the battery on the W124 cars, but the battery is in the trunk on the C280....)

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

And of course the 94 will have the infamous biodegradable wiring harness, unless someone has already replaced it.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

If I was a betting man I would say it is your OVP.....are the symptoms as follows;

Stalls out of the blue...won't restart straight away...leave it for 5-10 minutes and will restart and all will be fine etc etc. May also have a stumbling idle

If it is, its your OVP....the original relays had a design fault in them which results in the internal soldering breaking down and causing intermitent stalls....this will get gradually worse.

Sad to say that the expensive MAF replacement may not have been required....OVP relay will cost you about $60 and on my Right Hand Drive C280 its up by the ECU's on the right hand side of the engine bay. Silver relay about 3" high with a fuse on the top. Takes 5 minutes to replace.

Good luck

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Current Mercs
R129 1994 300-24SL
W124 320E Turbo Technics Twin Turbo 350bhp

Previous Mercs
W124 1986 Quad Cam AMG Hammer, 45,000 miles
W124 300E Turbo Technics Twin Turbo 320bhp
W124 E500