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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
At the main harness connection in the motor compartment 9&10 are the wires to the frequency valve ("Timing Valve"). You could try to pick up leads there for the test or at the FV its self using a Dwell Meter.

The circuit that you would ground to trigger the 75% duty cycle for more fuel is at the "Control Unit Oxygen Sensor" unit under the drivers seat, pin 12. Or, at the Control Unit Acceleration Enrichment" pin 14. See picture from the 92 Turbo service manual.

I do make mistakes but I got this off the 911 Turbo Model 92 Sheet 5 Engin Fuel, Ignition System wiring digram.

Very interesting!

Originally Posted by 911st View Post
Easiest way to get more fuel is to set the idle CO fat.

On a C2T I always wanted to try grounding thermal 12 at the Lambda control unit under the drivers seat to enable the acceleration fuel circuit which triggers the factory frequency valve to 75%. Could be a good place to use one of those MSD rpm switches. This could be the cheapest fueler yet.

Old 03-16-2009, 02:53 PM
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