Dear Tom and Ray - or anyone who can help:
I have a 2008 Saturn Aura XR. Great car. I’ve noticed an intermittent faint odor that I thought smelled like coolant.
But the authorized repair dealership (Buick/Chevy) conducted a dye/pressure test and found no leaks in the cooling system or water pump.
Their guess is that there is a crack somewhere in the intake manifold gasket set, causing a fuel vapor odor.
They quoted a very expensive estimate to replace the gaskets (including new spark plugs and a fuel system cleaning). Before I do that, is there any way to definitively determine the source of this intermittent odor?
I’d be thankful for any wisdom out there.