What causes a Buick Excelle automatic transmission to suddenly stall while driving?
1 Answers
Common causes of sudden engine stalling in vehicles include: 1. Vacuum leaks in the intake manifold; 2. Unstable idle due to improper idle adjustment, dirty throttle body, or malfunctioning idle control system; 3. Unstable fuel pressure caused by excessive wear or poor contact of the electric fuel pump brushes, or clogged fuel pump filter; 4. Blocked or leaking EGR valve; 5. Malfunctioning fuel pump relay, EFI relay, or ignition relay; 6. Poor contact in the fuel pump drive circuit or fuel injector drive circuit; 7. Ignition system issues such as weak or no spark due to worn spark plugs, incorrect ignition timing, poor contact in the ignition coil, or inter-turn short circuits when hot, as well as poor contact in low-voltage circuits, damaged insulation causing intermittent grounding, or poor grounding.