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The result is an engine that fails to maintain idle RPM and frequently stalls. A jammed actuator may be freed simply by cleaning it. However an actuator that has stopped working due to a fault in its servomotor will need replacement. Air leaks in either the stepper housing or pipes will cause elevated idle RPM.
Adjustment of the carburetor idle speed and the air-fuel mixture, Inspection and possible replacement of ignition system components like spark plugs, contact breaker points, distributor cap and distributor rotor, Replacement of the air filter and other filters, Inspection of emission controls, Valvetrain adjustment.
Most air conditioning-equipped engines have an automatic adjustment feature in the carburetor or fuel injection system that raises the idle when the air conditioning is running. Engines modified for power at high engine speeds, such as auto racing engines, tend to have very rough (unstable) idle unless the idle speed is raised significantly.
In fuel injected engines, the throttle body is the part of the air intake system that controls the amount of air flowing into the engine, in response to driver accelerator pedal input in the main. The throttle body is usually located between the air filter box and the intake manifold, and it is usually attached to, or near, the mass airflow sensor.
It is one of the three major components for proper engine operation: the computer, electrically controlled carburetor, and the oxygen sensor in the exhaust system. [ 2 ] Starting with the 1986 model year, the AMC straight-4 engines used a throttle body injection (TBI) or single-point , fuel injection system with a new fully computerized engine ...
At lesser throttle openings, the air speed through the venturi may be insufficient to maintain the fuel flow, so then the fuel may be supplied by the carburetor's idle and off-idle circuits. At greater throttle openings, the speed of air passing through the venturi increases, which lowers the pressure of the air and draws more fuel into the ...
SECU-3 manages AFR on the carburetor engines (similar to AXTEC AFR systems), idle cut-off valve and wide open throttle mode valve in carburetor systems, controls electric fuel pump and gas valves in closed loop mode according to the feedback from the oxygen sensor. The SECU-3 system provides unique opportunities for reassigning the I/O pins of ...
This causes the air pressure in chamber A to drop in proportion with the partial vacuum in the boost venturi. [14] At the same time, air entering the carburetor compresses the air in the impact tubes, generating a positive pressure in chamber B that is proportional to the density and speed of the air entering the engine.
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