and engineering staff; of trying to motivate Chevrolet engineers to resolve the car's problems before introduction; and of initiating quality control. He also said, "While I was convinced that we were doing our best with the car that was given to us, I was called upon by the corporation to tout the car far beyond my personal convictions about it." Problems Although the Vega sold well from the beginning, the buying public soon questioned the car's quality. The issues with the vehicle practically went back to the beginning of its development. For example, the front end of the vehicle separated in only eight miles on the General Motors Test track. The engineers had to add twenty pounds of structural reinforcements to pass durability. In Comeback:The Fall & Rise of the American Automobile Industry, the authors write: "In 1972, GM issued three mass recalls, the largest covering 500,000 Vegas, to fix defective axles, balky throttles and problems that caused fires. The Vega's aluminum engine was notorious for buckling and leaking." By May 1972, six out of every seven Vegas produced was the subject of a recall. Development and upgrades continued throughout the car's seven-year production run, addressing its engine and cost-related issues. Recalls The first Vega recall, Chevrolet campaign number 72-C-05, addressed engine backfires on 130,000 cars fitted with the L-11 option two-barrel carburetor. An engine that backfired with specific frequency and magnitude weakened and ruptured the muffler. Hot exhaust gases then, in turn, spilled out and heated the adjacent fuel tank which expanded, ruptured and spilled fuel that ignited and caused a fire. The second recall in early summer 1972, Chevrolet campaign number 72-C-07, involved 350,000 vehicles equipped with the standard engine and single-barrel carburetor. It concerned a perceived risk that a component in the emission-control system (idle stop solenoid bracket) might fall into the throttle linkage, jamming it open. Chevrolet told customers that if the throttle stuck open while driving, to turn off the ignition and brake the vehicle until it stopped. In July 1972, the company announced the third recall, "in as many months," campaign number 72-C-09, which affected 526,000 vehicles, the result of which was a rear axle which could separate from the vehicle. As it was recorded by NHTSA, the "axle shaft and wheel could then move outboard of the quarter panel and allow vehicle to drop down onto rear suspension." 140 CID engine Other quality