1990 Cadillac Deville

bkwilso · Posted at Wed May 14, 2008 5:26 pm

1990 Cadillac Deville
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WHAT MAKES MY 1990 CADILLAC DEVILLE BACKFIRE

Advertisment · Posted at Wed May 14, 2008 5:26 pm

mastertechtim · Posted at Wed May 14, 2008 5:28 pm

what comes to mind is, engine misfiring due to needing a tune up and low fuel pressure could be another cause.

Buzzsaw · Posted at Wed May 14, 2008 9:20 pm

bkwilso wrote:

1990 Cadillac Deville
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WHAT MAKES MY 1990 CADILLAC DEVILLE BACKFIRE

you need to scan your codes for me, off and warmer on the heater controls at the same time, with your key in the on position

Its probally your antibackfire valve that needs replacing and AIR pump, debris from the pump cause the valve to go bad, its on your back valve cover, yes the big black valve