Bad starter or bad battery for Buick lacrosse?

Asked by Jan 16, 2017 at 01:28 PM about the 2007 Buick LaCrosse CXS FWD

Question type: Maintenance & Repair

My car won't start and I'm not sure if it's the battery
or starter. When I pumped gas the past couple of
times it wouldn't start right away it would make a
humming noise for a while then start up. This
would only happen when I would pump gas. I tried
turning my car on and now it won't start but when I
turned the key everything in the car would turn on
on its own(whipers, radio, heater/AC and then the
car alarm sound would go off too). I tried jump
starting it too and it wouldn't work. Also when this
happened the ABS, traction light and engine light
turned on. Any help would be great.

3 Answers


pumping the gas on fuel injectected cars does nothing. I would guess fuel need about 40 psi or more for fuel injection, if the pump is weak you are not getting enough gas to start the car. You can borrow a fuel pressure tester from AutoZone and other auto parts stores


These cars act really goofy when the battery is going bad - mine exhibited very similar issues when the battery was failing, plus I can't think of any good reason why the car alarm would go off if it was a bad fuel pump. Sounds more like behavior exhibited by a car with a dying battery or loose connection. For anyone reading this, the battery is definitely the cheaper place to start and should certainly be considered a suspect if you're seeing behavior like this. I assume the original poster meant "filling the fuel tank with gas" - they shut the car off, fill the tank, and then the car won't start when they get back in the car to leave.


To continue... Yes, this could also be symptoms of a starter that's failing and drawing too much power. Starters and batteries can both be tested to determine what is at fault.

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