GMC Troubleshooting Questions? Ask a Mechanic for Answers
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Are you saying it will not start the first time you rank the engine but will the second time you crank the engine?
The keeps cranking issue, that is normal how it is supposed to work.
Can you tell me all the maintenance steps you have done in the last 70k?
Does this starting issue occur with the engine cold or when restarting when its already hot?
There is a slim possibility the EVAP solenoid vent valve, your code, is to blame. It can be releasing fuel tank vapors into the intake and effecting the air fuel ratio. I suggest after addressing the EVAP code. You do a tune up and use fuel injector cleaner and clean the MAF sensor. If that does not help then an injector flow test is needed to see if the injectors are leaking and flooding the engine.
This is my 1st answer, but does not have to be my only answer. You the website and myself expect you to have a ~~~5 STAR EXCELLENT~~~ experience with my help. Please let me know if you are pleased by selecting a star rating above or by replying and saying your pleased. Not rating or rating 1-2 stars does not benefit you nor me in any way. Follow up and reply as often and when needed, there is no extra charge to do so.
Yes I do recommend addressing all codes.
The EVAP system controls the fuel tank vapors.
Hello again Chris here,
That would be a component in the EVAP system not allowing fuel tank vapors to escape. You should replace the known component that you have faulty form the code first.
Sending you an offer that allows me to upload links from GM so you can see how to replace the part.
It is copyright info and this a public forum. I only share that info in private contact. I can explain it rather than do so with diagrams if that will work for you.