Why does my Chevrolet caprice brougham backfire when you shut it off

Asked by Feb 15, 2014 at 06:23 PM about the 1987 Chevrolet Caprice Classic Brougham

Question type: Maintenance & Repair

1 Answer

61,165

The diverter valve for the A.I.R. (Air Injection Reaction) system needs to be replaced. With this system fresh air is injected into the exhaust manifolds to continue the combustion process as the exhaust gases leave the engine. When at idle or you remove your foot from the accelerator pedal this fresh air is dumped or "diverted" away from the exhaust manifold and into the atmosphere by the diverter valve. If this fresh air is not dumped as it should be when you shut off the engine the exhaust system is hot enough that unburned gases are ignited in the exhaust system and it backfires VERY loudly, like a gunshot. You may even see sparks or a flame come out the tailpipe. HTH. -Jim

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