cause of multiple misfire on 2007 altima

Question

I first pulled the codes after a blinking check engine light...old #2 misfire and a new multiple misfire...checked Bauman lines and intake manifold for leaks...none found....put in New plugs...same code.....pulled out the fuel pump to check it...that helped ....but was still missing...just no code....so problem found...I bought a new pump...installed....and one mile down the road im backs to multiple misfires....any suggestions?

Answer 1

HI there,

A fairly common issue with these cars is a bad head gasket, that will cause multiple misfires, also bad ignition coils or a bad mass air flow sensor can cause them as well.make sure to check the catalytic converter, if it's broken up it could be blocking off the exhaust and causing the engine to misfire as well.