Hi,
To answer your Ultimate question of making a diagnosis, I will say, No!
Today's mechanics need a quick easy answers or otherwise if they don't see it they will charge you for their learning experience or practicing.
In most cases they start swapping parts one by one and hope to get lucky. There are more incentives to charge you enough so you don't come back.
At dealerships the incentive is the same but for you to get snagged by a sales man instead of the parts man.
Overall it's about turnover in both areas. The more customers they can get in that are a quick fix or frustrated in one day as all scenarios more money is exchanged. Except, I have never seen it come towards me.
Plain and simple mechanics are not into working on puzzles.
In the trade, they would call your car a "A Dog but it's in a race that their not putting their money in to, you will!
This type of customer is the same as a "Mark" in any other money making scheme. They play on your sympathy of loving your car like a Veterinarian does with your pet anymore.
On a list of things that can cause your problem the relay is number one. I suspect you may have read this on the board or had one fail before.
I best advice is do your own work and pay yourself to know more about your car and your surroundings. Being junkyards or a very nice and knowledgeable parts person.
I knew one, once, that would tell you that this item or that item fails more than others. He knew from what they sell in the department or what he heard the mechanics say to each other.
He needed input to keep certain things in stock or it was his butt.
He told me how an IAC valve always fails and tells on its self everytime upon a startup, if you listen to it for what it's not doing. Shoot the idle up and back down. Simple!
Same goes for you. You suspect this or that because it use to do this or that. You know your car better than a quick looking mechanic because you live with it.
I would trust what a owner/driver will say over any manual as vibrations and sounds speak volumes.
In your case the frequency of the problem and when it happens, helps.
Yes go with a gut feeling and "some" of the talented advisers on the Brickboard and you can become one too! (:-)
Phil
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