What could be causing 4.8 L Cadillac misfire?

Answer by  MechMan3 (885)

The camshaft position sensor and crankshaft position sensor work together to fire the coil packs, if one of these is failing/has failed the car will backfire. The northstar V8 has a COP ignition which can be tricky to troubleshoot.

Answer by  monocogger (432)

The most common reason an engine will backfire is if the spark timing is wrong. Another way an engine will backfire is if there is too little backpressure in the exhaust system which would be caused by a defective muffler or exhaust piping or a poorly sealed or cracked exhaust gasket.

Answer by  Amber40 (24961)

This may be due to an overly rich fuel mix. The excess gas explodes in the exhaust causing a backfire. You might have a timing issue also.

Answer by  Hellhammer (131)

Most likely you have a problem with your ignition system. Have the timing checked if you dont know how to do it your self.

Answer by  Anonymous

oil leak