Piston Slap: Solving the Black Box Mystery

TTAC Commentator Mazder3 writes:

Hey Sajeev,

I have an auto parts question that I’ve been meaning to ask for a while but I keep forgetting about it. Back in February, going to my car after doing some shopping, I spotted a cute college woman acting strangely around her Volvo 850 sedan. She’d walk around it a couple feet then would look underneath it. I angled myself to take a peek and I saw her problem; there was a large black box being dragged next to the left front wheel. After exchanging pleasantries and a failed attempt to get the hood open (the car was an obvious salvage, the whole front end was visibly skewed to the right), I finally just reached under the car and popped the box out, muddy and snowy parking lot be damned. At the time I thought it was a windshield washer reservoir, as the hose that was holding it on was a similar size and had a similar fitting to a windshield washer line, but when I got home I realized it couldn’t be. There was no way of filling it or checking its level.

So what was it? My memory has faded on it a bit but it was made of jet black plastic, was roughly the size of a 124 count tissue box, had a hose at the top and two fittings at the base, there was a sponge inside of it and the whole thing came down from in front of the driver’s side axle line. It had some major road rash so all of the parts might not have been there. The thing that I really remember, though, that it was branded with the GM “Mark of Excellence”!

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