The fuel injectors can develop leaks on some models, causing the engine to run poorly or to become less fuel efficient.
Problems for specific Nissan Maxima years:
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Most reported 1990 Nissan Maxima problems
The crankshaft position sensor can fail causing the engine to run poorly or it may crank but fail to start.
Failure of the vehicle's speed sensor can cause speedometer and the cruise control to become inoperative. A failed speed sensor will require replacement.
A coolant leak can develop from the front of the cylinder head that can appear to be a head gasket leak. There is a threaded plug just below the camshaft that may leak if there is corrosion present on the threads. Cleaning any residue, re-installing the plug with pipe thread (Teflon) tape, and torquing the plug to the specification typically repairs the leak.