I Have A 1992 Nissan Maxima Automobile That Runs Bad, What Are The Possible Problems?

Likely Causes



Spark Plugs -

Worn, faulty, fouled or incorrect spark plugs can cause the engine to misfire or run rough at all times.




Ignition Coil -

Weak or erratic spark output from a faulty ignition coil can cause the engine to misfire or run rough at all times.




Fuel Injectors -

Restricted, dirty or defective fuel injectors can cause the engine to misfire or run rough at all times.




Power Transistor Unit -

A defective power transistor(s) inside the power transistor unit can result in weak or no spark from one or more of the ignition coils causing the engine to misfire or run rough at all times.




Crank Angle Sensor (CAS) -

Erratic signals from a defective CAS can cause the engine to misfire or run rough at all times. NOTE: The CAS is located on the front end of the exhaust camshaft on the drivers side and is sometimes referred to as a crankshaft position (CKP) sensor or a camshaft position (CMP) sensor.




Engine -

Mechanical engine problems can cause the engine to misfire or run rough at all times.





Overlooked Causes



Grounds -

Poor engine control module (ECM) grounds or sensor grounds can cause the ECM to miscalculate fuel delivery and cause the engine to misfire or run rough at all times.




Fuel -

Poor fuel quality can result in incomplete combustion causing the engine to misfire or run rough at all times.