How to adjust fuel injection in Porsche 911?
Make sure that the car is warm when performing the adjustments, and also make sure that the engine is off when you turn any of the adjustment screws, or you can damage the pump. To adjust the idle mixture of the MFI system, you will need to turn the small adjustment screw that is located on the back of the pump.
Where is the mixture control unit located on a Porsche 911?
Mixture Control Unit(1), Injectors (2) . The Start Valve is located on back of intake manifold below the venturi assembly. The Thermo-time Switch is located on engine block below the secondary air pump. Warm-up Regulator (1) Electric Fuel Pump K-Jetronic Fuel Pump Test Point (arrow) Secondary Air Pump Pressure Hose (arrow) Porsche 911T, 911,911S
What do you need to know about a Porsche 911 SC?
In addition, 911 SC models use a thermo-valve, which enriches the fuel mixture during starting by blocking the warm-up regulator vacuum which de- creases control pressure. After starting, the valve opens by means of an electric heating element. Several component tests (Auxiliary Air Valveand Warm-up Regulator)require that the engine is cold.
How is fuel squirted out of a Porsche 911?
Fuel is squirted out of the injectors at a remarkably high 220-250 PSI. This high pressure aids in the atomization of the fuel, which in turn increases the surface area of the mixture. This results in a more efficient and complete burn of the fuel.
How to adjust fuel mixture in Porsche 911?
The mixture can be adjusted by turning a small hex screw that is located in-between the fuel distributor and the sensor plate. Use a long hex key, or the special mixture adjustment tool to turn the screw. The screw is indexed so that it should click when you rotate it.
Mixture Control Unit(1), Injectors (2) . The Start Valve is located on back of intake manifold below the venturi assembly. The Thermo-time Switch is located on engine block below the secondary air pump. Warm-up Regulator (1) Electric Fuel Pump K-Jetronic Fuel Pump Test Point (arrow) Secondary Air Pump Pressure Hose (arrow) Porsche 911T, 911,911S
In addition, 911 SC models use a thermo-valve, which enriches the fuel mixture during starting by blocking the warm-up regulator vacuum which de- creases control pressure. After starting, the valve opens by means of an electric heating element. Several component tests (Auxiliary Air Valveand Warm-up Regulator)require that the engine is cold.
Where is the injection pump on a Porsche 911?
The electric fuel pump located in the front of the car supplies pressurized fuel to the injection/distribution pump. The injection pump is the heart of the system, and is responsible for metering and providing the fuel to each cylinder. The pump itself consists of two main parts, the fuel pump assembly, and the compensating unit.