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

07 CX9 has low idle, sometimes will die

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Old 09-21-2011 | 04:29 PM
Monty24's Avatar
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Default 07 CX9 has low idle, sometimes will die

Recently my CX9 has seemed to have a low idle. When I am in park the idle will occasionally drop very low, like 3-400 or so, then the car will catch it and jump back up to normal. Every once in a while it drops and the car doesn't catch it and dies. It does not give a check engine light, and restarts fine.

It only seems to happen on very hot days, the cars temp is right at halfway, not overheating. I do have the AC on and it does seem to drop rpm when the radiator fan kicks on.

That is all i can think of. If you have any advice on what I should look at first, it would be much appreciated.
 
  #2  
Old 10-05-2011 | 05:28 AM
dieseldriver2003's Avatar
Joined: Sep 2011
Posts: 39
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It sounds like the engine is not getting adequate fuel? Maybe the injectors are dirty? How about you plug in a ScanGauge II and watch some data coming from the ECU?
Originally Posted by Monty24
Recently my CX9 has seemed to have a low idle. When I am in park the idle will occasionally drop very low, like 3-400 or so, then the car will catch it and jump back up to normal. Every once in a while it drops and the car doesn't catch it and dies. It does not give a check engine light, and restarts fine.

It only seems to happen on very hot days, the cars temp is right at halfway, not overheating. I do have the AC on and it does seem to drop rpm when the radiator fan kicks on.

That is all i can think of. If you have any advice on what I should look at first, it would be much appreciated.
 
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