I have a 2006 Pontiac g6 with 150,000 miles on it. Maybe once a day for the past couple weeks when I go to start it it will crank but not start. As soon as I attempt to start it again it starts up no problem. I used carburetor cleaner on it once and the problem stopped for a couple days. The car runs and drives smooth and it doesn’t idle hard at all. Does anyone know what this could be? It’s getting extremely annoying.

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    Welcome to Motor Vehicle Maintenance & Repair! Recently, my '06 Silverado was doing the same exact thing. It would crank and crank and crank, but not start ... sometimes. Other times, it would start right up. Sometimes it would take one extra try to get it going, while others it seemed it would never start, but ultimately would. The other day, it just wouldn't start. The check engine light came on and stayed on. I read the codes and it was the crank position sensor. Not saying that's what going on with you, but your description sounds very similar. If there's a code, read it. That'll help. Apr 16, 2019 at 19:33
  • When I go to read the codes, it only pulls up that it needs a new thermostat. I’m hoping this isn’t a major problem and can be fixed easily. I just bought this car about two months ago from a close friend.
    – BriannaD
    Apr 16, 2019 at 19:44
  • Did you clear the thermostat code? (Also, a thermostat wouldn't keep it from starting, but might affect how it runs.) Apr 16, 2019 at 19:57
  • Yeah, we’ve cleared it but everytime we do it comes back on. My boyfriend thinks it could possibly be the air filter and is gonna check it for me when he gets home.
    – BriannaD
    Apr 16, 2019 at 20:12
  • An air cleaner wouldn't cause it not to start, but rather would affect how it runs. What exactly is the code you're getting (the alpha numeric)? If you could edit that into your question, please. Also, if you know somethings wrong (ie: thermostat), fix it. Might just save you a ton of diagnosing and you know it needs fixed anyway. Apr 16, 2019 at 20:15

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I had the same problem on my 350z. Found out it was the crankshaft sensor. Mine had 4 of them. Dont no how many u have but I found the one was causing problem fixed

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