Question about Chevrolet Lumina

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I have a Chevy Lumina 3.1 L. When throttle is held at a steady speed, engine RPMs increase & then decrease. Do you why it does this & how to fix it?

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What does it do at idle if ok check throttle body and clean also check for a vacume leak

Posted on Dec 19, 2008

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I have an intermittent problem with engine power loss/lack of acceleration in my 1999 chevy Lumina. 3.8 L vin K. problem only develops on warm/hot days after sitting in standstill traffic idling for long...


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What is the function of the idle speed control valve?


The idle air control (IAC) valve assembly on a combustible engine monitors and manipulates the amount of controlled air moving around the throttle plate. The IAC valve is managed by the electronic control module (ECM) of the engine, which calculates the position of the IAC valve. Voltage pulses called counts extend and retract an internal conical-tipped shaft called a pintle inside the IAC valve. When the pintle is extended, the cone-shaped tip positions itself closer to the air inlet and restricts the amount of air allowed to pass through the throttle, building up more air around the throttle plate to increase the rpms of the engine. When the pintle is retracted, it moves away from the inlet and allows more air into the throttle away from the throttle plate, decreasing the rpms. The IAC valve operates and adjusts constantly while the engine is running to help prevent the engine from stalling or surging. This will not cause the engine to misfire!! Hopefully this helps

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1996 chevy lumina engine jumps when driving!


You have a bad "stepper motor" on your throttle...if you have more than 200,000 miles on the car be prepared to spend $200+ to fix...Sorry, just can't be done at home. :o(

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1992 Chev Lumina


I would have the car checked on the computor.Even if the engine light is off it will store the codes.When you get the codes it should point you in the right direction.I would say it's posibly the throttle position sensor.

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Maintaining a consistant speed


I would check the throttle position sensor

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