Pagoda SL Group
W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: afisk on October 06, 2013, 22:43:30
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Hello,
I have a '67 230sl and it has a bad thermostat in the WRD so shut off the WRD completely. As a result, the start-up is rough. I would like to hard wire a switch to the CSV so that I can control how long the CSV comes on during start-up. I know a few of you have done this and I would like advice on the best way to wire a switch onto the CSV.
Thanks in advance,
Aaron
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I would use an original 4 pole Bosch relay and heat shrink a nice wire harness, then have a small momentary switch inconspicuously placed under dash.
Then it will operate only as you hold the button. Mount near data plate for a clean look
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Are you looking to just have the valve open when you're cranking the starter, or do you want it to open during warm-up?
If just while cranking, you can hard-wire the ground (85) of the CSV relay -run a wire from where the pink wire connects to the thermo-time switch to ground. This will open the CSV the whole time you are cranking the starter. You could also add a push-button switch to this ground to control the valve.
If you want the CSV to open during, then the four-pin relay would work:
30 - hot in run
86 - hot in run
87 - to valve
85 - ground via push-button
BUT I think you would have to add a diode to the standard CSV power wire to avoid energizing the solenoid on the injection pump, which would probably kill the engine.
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If just while cranking, you can hard-wire the ground (85) of the CSV relay -run a wire from where the pink wire connects to the thermo-time switch to ground. This will open the CSV the whole time you are cranking the starter.
Did that too and works fine for me.