Air fuel ratio gauges rely on a sensor that is very much like an O2 sensor used in a car's emmission system. Therefore you would have to have 'bung' drilled and welded into your cars exhaust system to mount the sensor for the air/fuel gauge. After that, run the wiring and mount the gauge like any other aftermarket gauge.
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The P1135 is set when the Engine Control Module detects a heated oxygen sensor heater circuit malfunction. This could be caused by a faulty air-fuel ratio sensor or a faulty engine control module.
The diesel engine can operate at 12:1 to 24:1 at idle.
Do you think that the choke might be on or the fuel to air ratio might be off?
You must be talking about a CARBURETOR. They are called metering rods. They control how much fuel flows through the jets in the carburetor as you push the gas pedal. They can make a engine run lean or rich, by changing the air/fuel ratio.
Yes and No, this will increase the fuel intake to give a bit more torque, but the ratio between air and fuel may cause problems with the way the engine will run.