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just put a used 3100 motor in a 00' malibu and when i start it up it runs as though a foot is on the accelerator where is the problem there isnt an idle screw on the motor?


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You are correct in that there is no idle adjustment screw for that engine. Every thing is done electronically through the computer and related sensors.

What you are probably experiencing is due to a bad throttle position sensor. When this sensor fails, it can allow the computer to think the throttle is depressed which in turn makes the engine rev up very high. This is a quite common thing on those engines so I'd start there for sure.
_______________

GM Dealer Technician For 18+ Years
In the automotive industry for 20+


   
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I think a lot of improvement for this car has to be done by manufacturers..The Chevy Malibu has back seat troubles, claims GM. A redesign is reportedly in the works. Article source:Chevy Malibu a cramped pain in the rear


   
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