Buick 17111906 Tbi Throttle Body Assembly

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The tightness of the throttle body mounting bolts must be checked every 7500 miles to insure that there are no vacuum leaks. If you suspect that a vacuum leak has developed between the throttle body and the intake manifold, obtain a length of hose about the diameter of fuel hose. Start the engine and place one end of the hose next to your ear as you probe around the base of the throttle body with the other end. You will hear a hissing sound if a leak exists. Remove the air cleaner assembly. Caution: Do not allow foreign objects to fall into the throttle body while the air cleaner is off. There are two mounting bolts inside the throttle body and one mounting stud and nut on the right side of the throttle body mounting flange. Check all three to insure that they are tightened to the specified torque. If the bolts have loosened, tighten them evenly. Do not over tighten or you may strip the threads in the cast aluminum throttle body. If the vacuum leak persists after the mounting bolts have been tightened, the throttle body will have to be disassembled and inspected more closely. Reinstall the air cleaner assembly.