How to adjust CIS injection?
The two primary adjustments for the CIS are the idle speed and the mixture adjustment. 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.
How CIS injection works?
The main moving part is a central pin which is controlled by the air sensor plate. When the throttle is opened the increase of air into the manifold causes the air sensor plate rises and pushes the control pin into the FD which allows fuel out to the injectors.
What is VW CIS?
(Audi 80, VW Rabbit, Scirocco, etc.) CIS, or continuous injection system, is a method of fuel injection which is very different from modern cars. On a CIS engine, the air intake lifts a plunger, and fuel is injected in varying quantities depending on the position of the plunger.
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.
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 causes a hot start on a CIS system?
Hot start problems are common with CIS systems and may be caused by a faulty fuel accumulator (see Pelican Technical Article: Fuel Filter and Accumulator Replacement) or a faulty fuel pressure check valve in the fuel pump (see Pelican Technical Article: Fuel Pump Replacement ).
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.
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.
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.
Hot start problems are common with CIS systems and may be caused by a faulty fuel accumulator (see Pelican Technical Article: Fuel Filter and Accumulator Replacement) or a faulty fuel pressure check valve in the fuel pump (see Pelican Technical Article: Fuel Pump Replacement ).