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Old 12-07-2015, 10:28 AM
jbailey930's Avatar
jbailey930 jbailey930 is offline
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jbailey930
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very strange as you are stock CIS -- from the manual --

'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. The system doesn't differentiate among the six injectors: it sends the same amount of fuel to them at all times. 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.

Through 1979, CIS was a semi-open-looped system, which means that it didn't monitor the output gases from the engine to see if the air/fuel mixture was set at the appropriate levels. In 1980, emissions requirements forced the introduction of an oxygen sensor into the system, which helped the engine to better run at the appropriate mixture level through the regulation of fuel pressure inside the fuel distributor.
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