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#1
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M103 Temp Gauge Failure: Which Sensor?
Hey All,
On the highway the other the day the engine temp gauge on my '91 300E started bouncing between engine temp (under 80*C) and the bottom peg (0*). It would intermittently read temp and then bounce around & fail. My question: Which sensor feeds the gauge, where is it located, and how can I test it? I see three sensors/sending units listed on Fastlane: eng. temp. sensor, water temp sensor, and water temp sender, but I'm not sure which feeds the dash gauge. I'm sure it's easier to check the resistance of the sending unit under the hood before I try to rip the Instrument Cluster out & look for loose wires/bad gauge...
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Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress |
#2
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Single wire sensor
Here are the specs for the sensor with the gauge reading at each value OHM 110 = 60C 67 = 80C 38 = 100C I suspect you have a poor connection at the sesnor.
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A Dalton |
#3
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Where is the sensor located? Is it the one on the driver's side of the head towards the firewall?
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Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress |
#4
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Yes, it is on top, single pole, between cyl. 4 and 5.
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1986 300E - Ugly color, gorgeous heart. Never let a German car sit still. German cars don't leak. They mark their territory. |
#5
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Thanks brandob9. Love your signature .
I'll post results when I know them.
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Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress |
#6
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Try this one:
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1986 300E - Ugly color, gorgeous heart. Never let a German car sit still. German cars don't leak. They mark their territory. |
#7
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You should have got a wagon if you wanted more seats.
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1991 300 SEL 218,000 Km "Xsbank's rules of mechanical intervention: Always go for the easiest solution first; 90% of what ails a gasoline engine is ignition; After that its all a WAG." |
#8
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Probably a connection issue, my SEL had this. I just tightened up the metal clip and away I went.
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I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#9
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Just an Update:
I finally got under the hood yesterday. I wiggled the single pole connector in the head and the wire fell right out of it. Now I just have to get a 50' extension cord to get my soldering gun under the hood...
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Currently: 1972 350SL Euro 4spd 1973 BMW R75/5 1981 BMW R80GS 1995 FZJ80 with OM606 Conversion In Progress |
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