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Old 04-29-2002, 05:34 AM
Registered User
Join Date: Nov 2001
Location: Lisbon, Portugal
Posts: 42
Another Problem With My S500 W140!!!!!!!!!!

Hi all

YES It's true a have one more problem with my 93 S500!!
The Car has 150 kmiles now and in one year I spent more than 10.000 USD with repair services from engine to suspension to gearbox, well almost everything.
The car ridded perfectly for almost two months UAUU!!! But now has the following problem:

When It's hot, really hot it refuses to idle, the engine quits and don't want to start up normally, one have to floor the throttle paddle so the engine can start, and then can not idle properly.
This only occurs when the car is very hot, and the ambient temperature is very hot also 86 F.
At highway riding the car runs perfect, this only happens when the engine has to idle.


Thanks in advance

93 S500
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Old 04-29-2002, 05:41 AM
Ashman's Avatar
Service Advisor
Join Date: Sep 2000
Location: Sherman Oaks, CA
Posts: 4,748
Nto sure if your car has one, but search for OVP, and read the posts. yours sounds like it could be related to this inexpensive part, which is notorious for similar symptoms and many others.

I would also have the codes read, it could be showing a fault code for something specific.

Good luck on your search.

'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.
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Old 04-29-2002, 06:27 AM
Registered User
Join Date: Nov 2001
Location: Lisbon, Portugal
Posts: 42
NO! my car does not have an OVP it's all controled by the main control unit, but has 4 or 5 fuses inside this box, can this be the problem?

Thanks anyway

93 S500
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Old 04-30-2002, 07:49 AM
Registered User
Join Date: Nov 2001
Location: Lisbon, Portugal
Posts: 42
Hello all

Now I'm sure that this problem only happens when is very hot, if the ambient temperature is around 60 F there is no problem.

Does anybody have some idea of this cause?


93 S500
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Old 05-06-2002, 06:13 AM
Registered User
Join Date: Nov 2001
Location: Lisbon, Portugal
Posts: 42
Hi All!!

I send the car to the dealer so they can read the DTC's.
It is everything fine, it does not show a single error!!
I seriously suspect that could be the O2 sensor.
Can anybody give me a help about this?


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Old 05-09-2002, 11:46 AM
rmasteller's Avatar
Registered User
Join Date: Jan 2001
Location: Powell, Ohio
Posts: 500
With a car that complex, it could be many things. My "daily driver" is a much less expensive car, but it had numberous O2 sensors, both "upstream" and "downstream", go bad on it. Symptoms included:

Check Engine light on
Code regisered in OBD (On Board Diag)
Occasional fast idle
Occasional rough idle
Occasional stall from idle
99% normal operation while driving

I'm sure an O2 sensor would generate a code in an MB if it creates one in a cheap Dodge. I think you might need to look elsewhere if you don't have a code.

Since it happens only when the ambient temp is high, perhaps you need to look at air/fuel mixture sensors and systems. As the temp of air increases, it can carry more humidity and it gets less dense (less oxygen). I am not a mechanic by trade, I'm just trying to use my common sense.

Best of luck!
1980 450SL @ 103,000 miles
1966 230SL @ Unknown Milage
2006 C230 @ 110,000 miles (Sold)
1994 E420 @ 118,000 miles (Sold)
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