Recently my Buick started this problem. Half the time it starts and runs fine, the other half it will not start (after not being used for several hours). When it doesn't start, the first turn of the key sounds normal, but if I continue to try, there is a sort of "backfire" that seems to occur where in the air filter compartment, and there is a puff of white vapor/smoke in the same position.
I do have a check engine light that's been coming on for about 2 months, which I was told was saying that my EGR valve was bad. At the time I was told this at Autozone, they also said it wasn't a serious situation, and at most I would probably have reduced gas mileage until I replaced it.
I'm not sure if the EGR valve could be causing the random ignition failures, and while I wait on my paycheck, I took out the valve and attempted to clean it and oil it with WD40. It didn't fix the problem, so I'm wondering if this could be the whole problem, or if it's not involved, and what the issue might be.
Thanks in advance for any help!
Thursday, November 29th, 2018 AT 6:50 PM