Not long after owners purchased a few examples, these problems started. The electronic deactivation system proved insufficient and troublesome. Drivers complained of lag, surging, and stumbling that further compounded drivability. The automaker tried fixing the problem with software updates. Their efforts proved futile, and they discontinued the engine. Today, you’d better steer clear of the 1981 Cadillac Seville as the 6.0L L62 V8-6-4 V8 engine made it into our worst American engines list.
1 Pontiac Fiero
Many 70s and 80s cars get a bad reputation for either being slow, unreliable, or just plain ugly, but rarely do you hear of a car that hits all three circles. Well, that’s the Fiero for you. It was also expensive to maintain due to the complicated independent suspension and the capricious cooling system.
Safety issues also escalated since, by 1987, the fire count for the 1984 models hit a record 20 fires per month. This is a rate of one fire count for every 508 cars sold. Today, almost every Fiero needs an interior restoration, which takes due diligence. It also suffers from rust and exhaust leaks. Parts are rarely available since the Pontiac produced them in small numbers