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Old 11-05-2001, 09:48 AM
Registered User
Join Date: Oct 2001
Location: Lancaster, KY
Posts: 5
'89 300TE (M103) Intermittent Stall

I have read through most of the archives to see if I can't find some answers as well as simple tests to do to figure out my problem. I haven't been able to so I'm going to ask a few questions here for the group.

My '89 300TE (94K miles) with the M103 engine is having a stalling problem - starts up cold easily and may run til warm (may also not). Idle is normal and settles into 700-750 rpm range. Most of my stalling occurs when I'm off of the gas pedal and on the brake - coming to a stop light, turning the corner etc. This doesn't happen all the time but I've tried many things - put the car in Neutral (so that the rpm's increase) when coming to a stop - this has helped somewhat but the car can still die. The car drives like a dream whenever my foot is on the gas - on the highway, through town - just wonderful. Am getting around 20 mpg in city/highway driving.

Things that have been recently changed: cap, rotor, plug wires, spark plug, fuel filter, engine oil, air filter. So now to a few of my questions.
1. I do NOT get any voltage across the OVP (10A fuse) when the car is running - nothing, zilch, nada. The fuse is good - tried 3 different fuses all the same. Does this point to the OVP right off the back?
2. I've read that installing a 470Amp resistor on the temp sensor can help because the car is fooled into thinking that the car is still warming up. The car had this resistor in place but I've removed it - no change. Has anyone else tried the 470 Amp resistor?
3. After stalling - I can still hear the fuel pump for around a second so I don't think that is why the engine died. Therefore I am discounting that it is the fuel pump relay.
4. I've read that it might be the flywheel position sensor - I havne't checked this but wouldn't that make my car drive funny on the highway then?
5. O2 sensor seems to be working fine - don't know if it the original or not - may change it just in case but don't want to spend the money if I don't have to.

Any suggestions - please help - it's a wonderful car and I'd like to keep it but can't have my wife and newborn in the car if it stalls whenever.

Mike Burger
'85 190D 2.2 (227Kmiles)
'87 190D 2.5 (188Kmiles)
'89 300TE (94Kmiles)
'85 190D 2.2 5-speed
'87 190D 2.5 (non-turbo)
'89 300TE station wagon
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Old 11-05-2001, 10:17 AM
Registered User
Join Date: Oct 2001
Location: Lancaster, KY
Posts: 5

That would be Ohms and not Amps under item #2 - sorry........ a little ahead of myself.

'85 190D 2.2 5-speed
'87 190D 2.5 (non-turbo)
'89 300TE station wagon
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Old 11-05-2001, 11:01 AM
David C Klasse's Avatar
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Join Date: Jan 2001
Location: Mission Hills in the City of San Diego
Posts: 2,352
Well, sure sounds like the OVP to me?!
2006 E350 w/ 155k miles (Daily Driver)

1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)
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Old 11-05-2001, 12:45 PM
Posts: n/a
The fuse on the o.v.p. should have B+ at all times,if not check for B+ at terminal 30 (pin 1)of o.v.p. socket.
If you get B+ at the socket but not the fuse the problem is in the o.v.p..
If there is no power at the socket check for bad connections or broken wires at the connector strip on the right strut tower.
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Old 11-08-2001, 12:51 PM
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Join Date: Oct 2001
Location: Lancaster, KY
Posts: 5
WEll - I've been doing my own digging and pulled apart my OVP - in the process I probably ruined it but it is working. I resoldered some of the connections on the back because I wasn't getting voltage to the "idle control valve" at the front side of the fuel distributor. (To check and see if - going on memory here - the OVP is sending out correct information to the "ICV", measure the voltage from the blue w/ red stripe wire - this should read the same as your battery voltage.) I was only seeing around 0.156V here so I took apart the OVP.

To my surprise, it hasn't stalled since - it still isn't running right but a whole lot better than before. The date on my OVP was Feb. 11, 1988 - so 13 years have definately taken their toll.

I will let everyone know what other changes I make and see if they help my poor running engine.
'85 190D 2.2 5-speed
'87 190D 2.5 (non-turbo)
'89 300TE station wagon
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