Did you got the fuel pressure checked.As you say it sometimes not starting and sometimes starting, this indicates that fuel pump is bit weak, its not letting fuel to the engine.Try spraying starter fluid to the throttle body and then see is it starting with starter fluid.When you face the no start problem like this at that time spray the starter fluid and see if its starting up right.If it starts then its fuel pump and filter issue.The pump is loosing its pressure.-------------But if the same no start problem with starter fluid too, then it can be air filter blocked issue or transmission trans-axle issue or shift bezel issue or it can be low tire pressure issue.----------
Click the link below for more details:---
http://technoanswers.blogspot.com/2011/06/2007-jeep-commander-sometimes-does-not.html
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This should help.Thanks.Helpmech.
If the crank sensor goes bad, the check engine light will illuminate on dash.But in some cases this light does not come on.Even, though the parts go bad.---------
But as you mentioned, starting rich and fuel pressure is good.In that case, there are few things, that are to be checked.-
The crank sensor, the o2 sensor.The catalytic converter, if its clogged got dirty, same problem of running/starting rich will be noticed.Cracked or clogged injectors.--------
But most probably,the crank sensor and o2 sensor.Get this checked, this will help.Thanks.Helpmech..
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The fuel pressure checked good. What is seems like is the Jeep is starting too rich. Usually on the second attempt to start it backfires and a strong fuel smell is there. Is there any way to adjust starting richness? Also would a faulty crank sensor cause this situation. If it was a crank sensor, would it produce a fault code?
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