What causes a car engine to crossfire at idle?
What causes a car engine to crossfire at idle? By design the resistance it takes to fire the coil via the spark plug is figured into the system. When this resistance becomes excessive due to severely worn spark plugs or a bad ignition coil it can cause these drivers to malfunction at which point they can crossfire into an opposing cylinder either under power or at idle. What causes a Chevy 350 to backfire when idle? If a main vacuum hose such as the power brake booster feed line has broken or failing off it will cause a lean backfire...