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Cranking over but only starts sometimes

Tiny
BREELUND DAVIS SR.
  • MEMBER
  • 2005 CHEVROLET IMPALA
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
My car cranks over but will not start. I disconnected the battery four to five times when this first happened and it fired up. Drove it all day. The next time it happened I had to disconnect the battery over night and then it cranked. Wondering what could be the problem? Any suggestions? Oh yeah, replaced both crankshaft sensors and it is getting fire from spark plugs. Can not figure this out. Any suggestions?
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Tuesday, January 30th, 2018 AT 10:31 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, I suggest checking the fuel pressure to be sure you do not have a failing fuel pump. There is an access port on the fuel rail by the power steering pump. If you do not have a tester you can rent one at a parts store.

Roy
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Tuesday, January 30th, 2018 AT 12:30 PM
Tiny
RENEE L
  • ADMIN
  • 1,257 POSTS
Hello BREELUND DAVIS SR,

Thank you for visiting 2CarPros. Here is a helpful link to an article from this site with step by step instructions and pictures explaining the process of checking the fuel system pressure, regulator and fuel pump in less than fifteen minutes:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you need further assistance please come back to the site we are always happy to help.

Kindest regards,

Renee
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Tuesday, January 30th, 2018 AT 1:20 PM

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