Occasionally we get reports of people who have their cars consistently backfire, yet their check engine light isn’t on nor do they have a clue what is causing the backfiring to happen. This is where we recommend doing a scan of your car anyway. Why? Your check engine light itself may not be working!
Even if your check engine light isn’t on, the onboard computer can still store a code, it just didn’t happen to trip the mechanism that turns on the check engine light. Bucking usually occurs from a cylinder misfire.
The problems that typically cause misfires originate in the components of the secondary ignition. You’ve already replaced the coil pack, but it could be a bad spark plug, a bad plug wire or a faulty crank sensor. The crank sensor tells the car’s computer which plugs to fire. In most cases this is a relatively easy fix, so definitely come in and see us so we can scan your car to determine what is causing it to backfire.
If you live in Essex, Burlington, South Burlington, Colchester, Winooski, Williston, Shelburne and anywhere in the State of Vermont be sure to contact Handy’s Service Center for all your auto repair needs!