Here are 15 engines that made enthusiasts everywhere wince—and for good reason. Strap in for rattles, leaks, and design blunders that turned dreams of reliability into nightmares on wheels. 1. Pontiac 2.5L “Iron Duke” Inline‑4 Introduced in 1977 and soldiering on until 1994, the 2.5L “Iron Duke” was meant as GM’s answer to economy and … Continue reading 15 of The Worst Engines to Ever Sit Between Two Fenders