1990 Cadillac Deville engine backfires when trying to start

1990 CADILLAC DEVILLE
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GO48JJGO
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Engine Mechanical problem
1990 Cadillac Deville V8 Front Wheel Drive Automatic 65xxx miles

hey i seem to have a problem when i go to start my car it cranks but it will just backfire out of the exhaust. i have new plugs,wires,cap,coil and fuel filter. wondering what else i can check to resolve this problem. thanks in advance
Nov 21, 2009 at 1:34 PM
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RASMATAZ
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Do below:

Disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs,coil's resistances,cap and rotor /distributor pick-up coil, ignition control module, ECM,Ignitor camshaft and crankshaft sensors- Note: If it doesn't apply disregard it
Nov 21, 2009 at 2:47 PM
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