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Crank but no Turnover (Ideas?)

jfath14

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jfath14 Enthusiast

jfath14

Posted
Posted

Good morning all. Ever so often, on a cold morning it would appear, my truck will crank but it will not turnover. If it sits for a while it will turnover and run fine for days. Then, it will do it again out of the blue. It has been record cold here lately, in Texas, but I am not sure that has anything to do with it. Any thought? 2012 Sierra 1500 4X4. 71,000 miles. The battery is fine and is putting out normal voltage. I appreciate any of your thoughts. 

diyer2 Senior Enthusiast

diyer2

Posted
Posted

To clarify this statement.

Ever so often, on a cold morning it would appear, my truck will crank but it will not turnover.

Do you mean it will turn over/crank but won't start/run?

 

:)

jfath14 Enthusiast

jfath14

Posted
  • Author
Posted
27 minutes ago, diyer2 said:

To clarify this statement.

Ever so often, on a cold morning it would appear, my truck will crank but it will not turnover.

Do you mean it will turn over/crank but won't start/run?

 

:)

Yes. I am sorry. I am no gear head. I apologize for my ineptness. Hopefully I can get there at some point. 

Logan Lanfear Enthusiast

Logan Lanfear

Posted
Posted

I had an issue similar to that on my 2008.  Turned out to be the fuel pump putting out weird pressures.  Id bring it somewhere and have them check it out with a good scan tool.  Is the check engine light on?

jfath14 Enthusiast

jfath14

Posted
  • Author
Posted
2 hours ago, Logan Lanfear said:

I had an issue similar to that on my 2008.  Turned out to be the fuel pump putting out weird pressures.  Id bring it somewhere and have them check it out with a good scan tool.  Is the check engine light on?

No sir, the check engine light is not on. Did they replace your fuel pump?

diyer2 Senior Enthusiast

diyer2

Posted
Posted

Are you capable of fixing it if you find the problem?

Have tools?

This could be an electrical or mechanical problem.

Maybe hard to find.

I agree take it to an auto parts store and have them check for codes. Some will do it for free.

The best is a tech2 scanner. Auto stores don't have them I believe.

If no codes then the next time it happens a fuel pressure check is where I would start. Google it.

 

:)

 

newdude Senior Enthusiast

newdude

Posted
Posted

Could be the cold.  If I had to guess, Texas might not use any winter blended gasoline (I could be wrong). 

 

 

 

sefiroxx Enthusiast

sefiroxx

Posted
Posted

Check:
- fuel pressure, free rent a tool at local parts
- check spark, timing light
- check sensors, scanner with truck on not necessarily running or starting

jfath14 Enthusiast

jfath14

Posted
  • Author
Posted

Guys.... I kid you not... there was NO fuel pump fuse in the fuse slot. How in the F does that happen? I bought this truck two months ago and it runs without a fuel pump fuse for two months. I placed a 25A in the slot and it fired right up. Can anyone please tell me how this is possible? I am at a loss. 

Logan Lanfear Enthusiast

Logan Lanfear

Posted
Posted
On 3/5/2019 at 12:54 PM, jfath14 said:

No sir, the check engine light is not on. Did they replace your fuel pump?

They did.  Solved the problem.

Sounds like you got your problem fixed. 

GM always Enthusiast

GM always

Posted
Posted

your oil pressure sender will also close the fuel pump circuit through the pcm and the pcm fuse.  that's how it has been running so far

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