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#1
06-09-2002, 08:28 AM
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Engine Stumble at Idle
I have noticed that my engine has a slight (very slight) stumble at
idle. I checked the wires and my number 1 spark plug wire reads 5,000 ohms-should be 1,000 to 2,000, so I will replace all the wires just to have a fresh set. The wire between the coil and distributor cap reads 10,000 ohms. Does anyone know if this is correct? Is the resistance suppose to be this high for radio noise supression? Any insights would be appreciated!
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Regards, Tom S. 1971 280SL Tunis Beige Metallic 1971 280SL Tobacco Brown (13K miles) 1970 280SL Deep Red 1994 E320 Cabriolet 1999 E320 Wagon 4Matic 2002 LX 470 1992 Land Cruiser 
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#2
06-09-2002, 08:45 AM
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Thanks Arthur.
Yes, it is the w113 that I am referring to. When you say "trace" resistance, does that include the wire from the top of the coil to the top of the distributor cap? Is that wire suppose to have a resistor end? That wire (my coil-distributor wire) has 10,000 ohms of resistance. Tom Sargeant
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Regards, Tom S. 1971 280SL Tunis Beige Metallic 1971 280SL Tobacco Brown (13K miles) 1970 280SL Deep Red 1994 E320 Cabriolet 1999 E320 Wagon 4Matic 2002 LX 470 1992 Land Cruiser
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#3
06-09-2002, 08:58 AM
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That is the primary wire and it is supposed to be solid copper . They get the resistance for this cicruit by having a carbon resistor built into the rotor.
That is why I mentioned that someone has changed the wire and you will prob find they used a Resistance wire. Make sure they did not also use resistor plugs...
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#4
06-09-2002, 09:50 AM
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If you are talking of the 113, they came with solid copper wires. There should be trace resistance.
The resistance comes from the resistor ends that sit on the plugs at the end of the plug wires and the dist cap has a carbon rotor contact with a resistance rotor. Someone may have swapped to resistor wiring....
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