What causes rough idle on a Porsche 924?
The injector sits in a phenolic housing that is both an insulator and mount. These are threaded and can leak around the threads. Any air leak will cause a rough idle. The injection is pretty fool-proof. Oil residue on hte air sensor plate causes idle flutter and roughness.
What kind of engine does a Porsche 924 have?
The 933, the DP road race 924, used the 931 head as it has a slight combustion chamber in the head , but requires some very strange looking pistons to get any sort of compression. The stock intake and exhoust from the NA engine bolt right on, though a 4-into-2-into1 collector header works best.
Where is the start valve on a Porsche 911?
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 through model 1975
What does the thermo valve do on a Porsche 911?
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.
How do you change the timing on a Porsche 911?
The timing setting is changed by rotating the distributor slightly. Take a 13mm wrench, and loosen up the nut that holds the distributor secure to the engine case. While the engine is running and the timing light is shining on the pulley, gently rotate the distributor until the timing mark on the pulley lines up with the notch in the fan housing.
The 933, the DP road race 924, used the 931 head as it has a slight combustion chamber in the head , but requires some very strange looking pistons to get any sort of compression. The stock intake and exhoust from the NA engine bolt right on, though a 4-into-2-into1 collector header works best.
The injector sits in a phenolic housing that is both an insulator and mount. These are threaded and can leak around the threads. Any air leak will cause a rough idle. The injection is pretty fool-proof. Oil residue on hte air sensor plate causes idle flutter and roughness.
How to set the dwell on a Porsche 911?
Be very careful not to place any tools or fingers near the fan when the engine is running, and watch the cord of the timing light as well. On the pre-1977 911s, you must set the dwell angle for the points as well as the timing position of the distributor.