When did Porsche start using CIS fuel injection?
The system in general is very reliable, and was only bested in 1984 by the introduction of the Motronic engine management system that controls both ignition and fuel injection together. The CIS meters the amount of fuel provided to the cylinders as a function of the air drawn into the engine.
What kind of fuel injection does Porsche use?
For more than ten years, Porsche used the Bosch K-Jetronic Continuous Injection System (CIS) on all production 911s. The system in general is very reliable, and was only bested in 1984 by the introduction of the Motronic engine management system that controls both ignition and fuel injection together.
Can a cracked fuel injector cause an engine fire?
Any external fuel injector leaks such as a cracked fuel injector body or bad fuel injector O-rings can cause an engine fire at any given time. At engine shutdown the fuel pressure should maintain operating pressure or just below that for a substantial period of time.
Why is my fuel injector not delivering fuel?
If the spark plug is dry, then the injector does not deliver fuel to that cylinder. If the spark plug is wet and smells like gasoline, then the injector on that cylinder is not your problem. Moving the suspect injector to another cylinder is one way of diagnosing the problem. If the problem moves with the injector then Bingo.
The system in general is very reliable, and was only bested in 1984 by the introduction of the Motronic engine management system that controls both ignition and fuel injection together. The CIS meters the amount of fuel provided to the cylinders as a function of the air drawn into the engine.
What causes a fuel injector to misfire?
Lean misfire causes that only affect one cylinder include a dirty fuel injector, an open or shorted fuel injector, or a problem in the fuel injector driver circuit (wiring or PCM). Compression problems that may cause a misfire include a burned exhaust valve, bent intake or exhaust valve, or leaky head gasket.
For more than ten years, Porsche used the Bosch K-Jetronic Continuous Injection System (CIS) on all production 911s. The system in general is very reliable, and was only bested in 1984 by the introduction of the Motronic engine management system that controls both ignition and fuel injection together.
Can a fuel injector not receive the correct voltage?
It is possible for the injector to cause issues even if it is receiving the correct voltage. They can clog up, which will decrease the spray inside the cylinder. This, in turn, causes the fuel to not burn completely and will create a misfire.
How does the CIS fuel injection system work?
Unlike pulsed-injection systems like the Motronic system or even the earlier Mechanical Fuel Injection system, the CIS injectors distribute fuel to the cylinders at all times. The opening and closing of the intake valves controls the intake of fuel into and out of the combustion chamber.
How do you test a CIS fuel pump?
Using a CIS fuel pressure tester, verify the proper operation of the fuel pump by measuring the pressure when the ignition is turned on. The pressure measurements need to be taken at specific times, and at varying engine temperatures.
How does the CIS work on a Porsche 911?
The CIS meters the amount of fuel provided to the cylinders as a function of the air drawn into the engine. The CIS air flow sensor plate measures the amount of air that is being drawn into the system. This sensor plate is attached to a fuel distributor that evenly meters the amount of pressurized fuel sent to each injector.