Question about 2000 Chevrolet Cavalier

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My 2000 cavalier was at the stop sign and the engine for no reason started racing to 3000 rpms nearly throwing me into traffic! WTF?!!! the wrench service light just came on yesterday and stalled out once

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Sounds like a throttle position sensor sticking in a very dangerous position. The throttle position sensor does exactly what it sounds like. Senses the throttle position and sends it to the injectors, if the position sensor is sticking open it is a very dangerous situation. Get your vehicle to a mechanic and have them scan the check engine light and besure that is the issue before going any further, but that is your most likely answer, Good Luck!

Posted on Dec 12, 2009

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Posted on Jan 02, 2017

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Have an fx45.Should the tach read 25-3000 ROMs when moving at 75mph? Auto tranny seems like it should be in higher gear.


there is not info to be able to give a definite answer
to work it out
you have top know the diff ratio, wheel tyre circumference to be able to work from rpms of the engine to road speed
However as a pointer, most cars will be around 3200 rpms at 60mph as this will be direct drive and od causes a drop in rpms
Being an automatic find yourself a good section of low traffic road and start from stop slowly increase the rpms and watch the rpms. keeping the accelerator steady you will see when the auto changes by a drop in rpms. slowly increase road sped until you see the next drop in rpms and so on. Over drive normally comes in around 55 mph or around 3000rpms
I would think that it is working because 3500rpms at 75mph is reasonable rpms to be expected. If it wasn't working I would expect the rpms to be around 3800 to 4000.at 75mph

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This happened to me without an ABS light and it was the upstream O2 sensor. The reason it throws the Trac light is because if any components that the traction control uses (ignition, fuel) are affected by a bad sensor, the PCM shuts down traction.
In fact, when I replaced the O2 sensor, a handful of other little issues resolved as well.
If you do have an ABS light on, it could very well be a wheel speed sensor.

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1 Answer

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