Mazda CX-9 This larger SUV adds a V6 option, as well as more cargo room, to the CX-7 option.

2009 Mazda CX-9 cranks but won't start

  #1  
Old 12-22-2018, 05:51 PM
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Default 2009 Mazda CX-9 cranks but won't start

I have a 2009 Mazda CX-9 that intermittently will crank but will not start. This problem happens when cold or hot and is very sporadic. When the problem occurs occasionally I can turn it off and wait a minute or two then it will start but this last time I was not able to start it at all. Any help would be much appreciated.
 
  #2  
Old 12-22-2018, 06:56 PM
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Has it been scanned for DTC's?
 
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Old 12-22-2018, 07:09 PM
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No it has not. The check engine light has not come on either.
 
  #4  
Old 12-22-2018, 07:20 PM
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I disconnected the fuel line from the fuel rail and relieved pressure then reassembled everything and it started first try. But it is still and intermittent issue.
 

Last edited by rumseyc; 12-22-2018 at 08:00 PM.
  #5  
Old 12-28-2018, 06:39 AM
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When was the fuel filter last changed?
fuel pump might be dying.
 
  #6  
Old 12-28-2018, 06:40 AM
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The PCM can still log fault codes without illuminating the check engine light.
 
  #7  
Old 12-28-2018, 09:23 AM
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Plugged in the code reader and it showed all systems normal with no codes shown. We also took it a step forward and replaced the starter because the gear was getting stuck out and not disengaging, and also replaced all 6 spark plugs with NGK’s. It was fine for a day then this morning we had the same problem where it wouldn’t start. It took a few times attempting to get it to start.
 

Last edited by rumseyc; 12-28-2018 at 11:33 AM.
  #8  
Old 12-29-2018, 05:43 AM
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Have you tested / measured fuel pressure?
 
  #9  
Old 12-29-2018, 08:20 AM
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No, I have not tested or measured fuel pressure because when we pulled the fuel line when we first encountered the problem there was pressure and fuel. Also once were able to get it started it runs as it should. Not sure if this helps but I have noticed the first startup of the day has no problems but after driving to a store and trying to start when leaving it has problems.
 
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