Not everyone who drives is an expert on auto performance, and that’s why ACDelco offers you this handy reference guide. Knowing something about how your vehicle performs and handles will make communicating with service advisors and technicians fast and easy.
Temporary, complete loss of power. Engine quits at sharp, irregular intervals. May occur repeatedly or intermittently. Usually worse under heavy acceleration.
Mild to severe ping, usually worse under acceleration and load. Engine makes sharp, metallic knocks that change with throttle opening. Sounds like marbles rattling around.
Engine runs after ignition switch is turned off. Runs unevenly and may make knocking noises.
Momentary lack of response as accelerator is pressed. Can occur at all speeds. Usually most severe when starting from a stop. May cause engine to stall.
Pulsation or jerking that changes with engine speed. Exhaust has a steady spitting sound at idle or low speed. Not normally felt above 30 mph.
Engine runs unevenly at idle. Car may also shake.
Engine delivers limited power under load or at high speed. Won’t accelerate as fast as normal. Loses too much speed going up hills. Has less speed than normal.
Less-than-anticipated response to increased throttle opening. Little or no increase in speed when accelerator is pushed down to increase cruising speed. Continuing to push pedal down will finally give an increase in speed.
Engine stops running or dies out. May occur at idle or while driving.
Vehicle speeds up and slows down with no change on accelerator pedal. Can occur at any speed.
Here is an auto performance troubleshooting checklist that will help you document problems with your vehicle. You can give this checklist to your counterperson, service advisor or service technician when you take your vehicle in for service.
PROPOSITION 65 WARNING: Battery posts, terminals and related accessories contain Lead and Lead components, chemicals known to the state of California to cause birth defects and other reproductive harm. Batteries also contain other chemicals known to the state of California to cause cancer. WASH HANDS AFTER HANDLING.