Cranks but no start

Tiny
CMPTR69
  • MEMBER
  • 2007 GMC ACADIA
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 190 MILES
Changed crank position senor, new battery, got spark, new tuning valve. Cranks no start and bad smell of raw gas.
Saturday, September 28th, 2019 AT 3:34 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi,

If you can smell gas, have you pulled the plugs and made sure they were actually sparking or did you check for spark somewhere else?

If you have spark at the plugs, fuel, and compression then you should be able to start. So that means we need to check each of these things. Let's assume for now that you have fuel because you can smell it and we will come back to that if all else checks out.

Pull a spark plug and see if it is fouled. If it is replace them. However, if it looks okay, reinstall the coil and boot (assuming yours is coil on plug as it appears, and then hold that against the engine block to make sure you have a good spark.

My thinking with this is, excessive cranking will foul a plug quickly and it will not start. I just want to rule out the fact that something you did fixed it but now your plugs are fouled. If this is the case, it will drive us crazy. Trust me, I have done this. Fouled new plugs while trying to fix a no start then fixed it and it still wouldn't start because new plugs were no good any more.

Then we need to do a compression check and make sure that is ok as well. Once these two things check out we can go back and make sure we are getting fuel to the combustion chamber.

https://www.2carpros.com/articles/how-to-test-engine-compression
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Sunday, September 29th, 2019 AT 2:40 PM

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