Hi Carl,
the FV DC is check
Hi Carl,
the FV DC is checked at the FV by hooking the 2 wires from the old timey Analog Dwell Meter set on 4 Cylindersetting, one DM wire to one each of the FV wires by slipping the protective rubber boot back on the FV wiring connector and inserting small adapters into the plug that can be reached by the DM wire clips. Once connected start engine and once closed loop condition is reached a properly tuned engine would read a Duty Cycle of 45%-55% needle gently swinging back and forth...if the Duty Cycle is out of spec...it will be neccesary to access the Mixture Control Screw at the Fuel Disttributor...for rich condition the MCS would need a CCW turn for correction, if the Duty Cycle indicates Lean Condition the MCS would need a slight CW adjustment...each time replacing the FD access port screw to plug the air leak which will cause erroneous readings. Each time an adjustment is made the 02 sensor should be unplugged, make corrections at MCS as necc. , replug 02 sensor..check DC.
To perform this test properly the engine should be warmed to open loop, O2 sensor connected.
All adjustments should be in small increments, access port replugged after each adjust and 02 sensor unplugged while adjusting and replugged after adj. and before rechecking DC.
Is any of this clear???
Regards, JRV
the FV DC is check
Hi Carl,
the FV DC is checked at the FV by hooking the 2 wires from the old timey Analog Dwell Meter set on 4 Cylindersetting, one DM wire to one each of the FV wires by slipping the protective rubber boot back on the FV wiring connector and inserting small adapters into the plug that can be reached by the DM wire clips. Once connected start engine and once closed loop condition is reached a properly tuned engine would read a Duty Cycle of 45%-55% needle gently swinging back and forth...if the Duty Cycle is out of spec...it will be neccesary to access the Mixture Control Screw at the Fuel Disttributor...for rich condition the MCS would need a CCW turn for correction, if the Duty Cycle indicates Lean Condition the MCS would need a slight CW adjustment...each time replacing the FD access port screw to plug the air leak which will cause erroneous readings. Each time an adjustment is made the 02 sensor should be unplugged, make corrections at MCS as necc. , replug 02 sensor..check DC.
To perform this test properly the engine should be warmed to open loop, O2 sensor connected.
All adjustments should be in small increments, access port replugged after each adjust and 02 sensor unplugged while adjusting and replugged after adj. and before rechecking DC.
Is any of this clear???
Regards, JRV