Uploaded May 2026 | Updated September 2026, 2 days ago

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A car backfire happens when fuel ignites at the wrong time, often in the exhaust or sometimes back through the intake, creating a loud pop or bang. In this guide, we explain why a car backfires and the first things to check, including ignition misfires from worn spark plugs or bad ignition coils.

Timecode:
00:00:00 - Intro
00:00:43 - What A Backfire Is
00:01:10 - Identify Exhaust vs Intake Backfire
00:01:48 - Spark Related
00:02:28 - Vacuum Leaks
00:03:04 - Fuel Delivery - Lean Conditions
00:03:38 - Exhaust Leaks Upstream
00:04:11 - Timing & VVT Issues
00:04:48 - Mods, Tunes, and Sensors
00:05:23 - What To Do Next