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testing CO with dwell meter-How?? 700 86

posted by  someone claiming to be Ron Hawkins on  Thu Dec 7 11:01 CST 2000 [RELATED]

I have read a time or two about using a dwell meter to test several functions of the emission control using a dwell meter and some existing test connections, Is any one out there in the know?? would appreciate any help.

thanks,

ron







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    Re: testing CO with dwell meter-How?? 700 86

    posted by  someone claiming to be John Sargent on  Thu Dec 7 13:09 CST 2000 [RELATED]

    The dwell meter is simply connected between the CO test point and the battery. The CO test point is the green wire with white tracer adjacent to the red wire with whire tracer which are in a common connector on the right fender well of the 740 series. This two wire connector is usually just in front of the coolant reservoir, and nothing is plugged into it. Adjust the mixture screw in and out until the meter needle makes equal sweeps. Then turn the mixture screw in two to three turns for improved cold running. Instead of the dwell meter you can use Volvo tool number 9995280, which is simply a diode in series with a 750 ohm (or close) resistor. I used a 680 ohm resistor when I made mine, and the led flashes on and off equally when the mixture is properly adjusted.







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      Re: testing CO with dwell meter-How?? 700 86

      posted by  someone claiming to be steve mahnken on  Thu Dec 7 13:36 CST 2000 [RELATED]

      Hi John, I was told you could use a DMM to do this. I've been setting CO by checking voltage from the grn/wht wire to ground and adjusting the mixture screw until the voltage swings back and forth between 0-12V. Is this wrong?

      Thanks

      Steve







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        Re: testing CO with dwell meter-How?? 700 86

        posted by  someone claiming to be John Sargent on  Thu Dec 7 13:45 CST 2000 [RELATED]

        That sounds fine to me. The CO test point appears to just make a connection to gound, by the ECU, when the mixture is correct. Equal sweeps from zero to 12 volts would be the same.






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