The majority of the Subarus towed into his shop with timing belt failure can often be traced to an idler pulley failure that resulted in the belt coming off, says Bob Dowie, who advises to replace the pulleys if you have any doubt about their condition, notice grease coming out of them, or if there is roughness or noise when they are spun.
One might expect that low oil pressure indicates a problem with the oil pump, but that is not necessarily the case. Very often, using an out-of-spec motor oil, such as one with a lower viscosity than what is recommended by the vehicle manufacturer, will cause low oil pressure.
There are times when all the diagnostic trees, diagrams and graphs in the world aren’t enough to properly repair a vehicle. Sometimes, you just can’t get from Point A to Point B without some homemade ingenuity – a little of that “MacGyver” magic to pull you through the next obstacle. It’s all part of that “natural mechanical ability” each one of us possesses.
Give him an unusual tire wear complaint, and he’ll give you a tire wear problem that begins and ends at the steering knuckle, says Gary Goms, who adds that diagnosing a “green-zone” camber problem requires an understanding of steering geometry far beyond what a basic knowledge of camber, caster and toe angle can solve.