Common reasons for this to happen:
- When moisture or resistance in the car’s electronic ignition system allows a crossover generation of current to the wrong cylinder.
- A lean mixture caused by either an engine vacuum leak or low fuel-pump pressure.
- A faulty air injection check valve (part of the car’s emission control system) allows too much air into the car’s exhaust system.
- A failed air intake boot can cause a backfire by altering the feedback voltage to the PCM.
- Faulty ignition components or spark plugs may also cause backfires if the ignition timing drifts off or the plugs fire intermittently.
- An exhaust leak such as broken welds or other small holes can take in cool air during deceleration and cause a popping or backfiring in the exhaust system.
What to expect:
A top-rated mobile mechanic will come to your home or office to determine the source and cause of the engine backfiring, and will then provide a detailed inspection report that includes the scope and cost of the necessary repairs.
How important is this service?
Backfires generate sudden high-pressure events in the exhaust system, and can do serious damage if left unchecked. Have the car inspected by a professional mechanic as soon as possible.