Question about 2003 Chevrolet Cavalier

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My 2003 cavalier wont start,it will if you pur gas in the throttle body,is it my fuel pump? the obd2 scanner said system running lean, pressure low.Odd enough the battery wont stay charged, It was parked for 3 or 4 days prior to all this.

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A failing fuel pump is the most common cause of a low-pressure situation. The battery should be completely unrelated; it's either a bad battery or a parasitic draw. Fuel pumps do not have access to key-off batt voltage, therefore cannot cause a parasitic drain. However, there are many things which can cause a parasitic drain. This can be determined by removing the ground cable from the battery and hooking up an ammeter in-line between that cable and the open negative post on the battery. A normal key-off drain is 20-50 mA (to power the clock/ECM/etc...make sure no interior lights are on while your doing this). More than that means there is a malfunctioning component somewhere w/ access to constant battery voltage.

Posted on Sep 29, 2009

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