My mechanic thinks a hissing sound in the Up Idler Valve (Diaphragm Assembly per Toyota) is the reason my truck is running sluggish. Recently replaced timing belt, re-built transmission, new Cat, etc etc.
My mechanic thinks a hissing sound in the Up Idler Valve (Diaphragm Assembly per Toyota) is the reason my truck is running sluggish. Recently replaced timing belt, re-built transmission, new Cat, etc etc.