RAY: This really happened. A few weeks ago a customer who works down the street came in with an older Volvo, a 60's vintage, one of those P-1800's -- Volvo's feeble attempt at a sports car in those days of the 60's and 70's. Anyway, it was an interesting looking car, and his complaint was that the car didn't seem to stop very well and he was sure that his power brakes weren't working. A quick test drive revealed this to be the case. When you first stepped on the brake pedal, when you first slowed down, the car seemed to stop quite well. But in fact, if you applied the brakes several times as if slowing down to avoid crashing into the back of some other vehicle, after 2 or 3 applications of the pedal it would be pretty rock hard and didn't really want to stop unless you stood on the pedal. So we pulled into the shop and I said, "Geez, I don't know, it could very likely be the booster." And he said, "Great. I have a used one which I know is good."
RAY: So a few days later he brings the car in again and the booster and we install the booster. I drive the car. I call the customer and ask him to drive it because I didn't notice any significant improvement. And we are sure now that the replacement booster is okay and it turns out the original booster was okay. So we look around. And the first suspect is the hose that leads from the manifold to the booster -- is it plugged? Is it restricted? It gets replaced. Still no improvement. After a few more minutes of tinkering and doing various tests, Ralph -- the Volvo wizard -- finally figures out what's wrong with the car, and it has to do with the kind of gas he's been using. Moreover, he does an adjustment that fixes the car. What's going on here? What adjustment does he perform that fixes the car - and it's not adjusting the timing either.
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[ Car Talk Puzzler ]