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Old 18 Mar 2008, 03:16 pm
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Default 1994 Honda Civic LX, Sensor Problem, Help!?

Hey everyone i need your help its a sensor problem, my car is acting up, whenever its cold it will rev at a normal RPM, then when it warms up, it revs up to like 1300 RMp then cuts down low low, it just keeps reving up and down when its idleing, but whenever im driving it, its fine, help me please
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Old 18 Mar 2008, 03:31 pm
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map sensor, throttle positioning sensor, check them all there on your throttle body and intake manifold.
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Old 18 Mar 2008, 03:46 pm
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the problem is usually caused by the idle air control valve that controls the engine idle by allowing a certain amout of air to bypass the throttle plates depending on the engine load. If its only happening at idle, its the idle air control circuit that is the cause of your problemthe problem can be caused by carbon build up in the passages for the valve (think of soot in a chimney). these passages are in the valve (located on the underside of the throttle body; it has two vacuum lines to it's ports and one electrical connector). the passages in the throttle body can also be clogged. You can try to clean them by spraying carburetor or throttle body cleaner into the passages to dissolve the carbonif that doesn't work then the valve will ahve to be replaced.the only other thing that may cause that is a massive vacuum leak from the intake manifold or a hung EGR valve. Its almost always the idle air control valve that is responsible for your problem with a 50-50 chance that cleaning it will fix ithope that helps
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Old 18 Mar 2008, 04:01 pm
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TW sensor = thermal water sensor.replace it.
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Old 18 Mar 2008, 04:16 pm
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Remove your intake air pipe and expose your throttle opening. Run your car on neutral while holding your rpm to 3000 until your radiator fan comes on (get your engine to reach normal operating temperature).Release your accelerator pedal and observe the rpm. If it is below 500 rpm, then clean out the screen for your Idle Air Control (IAC) valve. Otherwise replace it altogether.If your rpm hovers above 700 rpm, then plug the upper port hole inside the throttle opening with your finger and observe what happens.If your car dies, then adjust your idle adjustment screw. Otherwise, if it continues to run, you have an air leak somewhere getting into your throttle intake. Spray carburetor cleaner to clean out any gunk around the throttle intake flaps or look for any loose hoses.Good luck!
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