P1320, P304 codes on a 2000
Nissan Maxima - Also codes 301–312
A few times my 2000 Nissan
Maxima would suddenly run very rough, and the idle became so unstable it nearly
stalled out. This would clear up after about 15 minutes, when the engine would
sputter, the MIL would light up, and then the engine ran smoothly again. I read
a code P1320, "Distributor Signal Interrupt" each time, and at least twice it
was accompanied by a P0304, "Cylinder 4 Misfire Detected". I searched the
internet and found a
service bulletin on this problem, implicating the ignition system for
cylinder #4. The owner's manual describes how to replace the spark plug, which
requires removing the ignition coil. I replaced the ignition coil and spark plug
in cylinder #4, and the problem has not happened again. The total cost of the
parts was $100, including a new spark plug socket wrench!
A few months before I
successfully diagnosed this problem I mentioned the P1320 code to the dealer.
They said all they could do for that problem was to replace all six ignition
coils at a cost of more than $600. Key to this repair was identifying the
specific cylinder (the P0304) code that was having the problem. Note that codes
301- 312 all indicate cylinder misfires, for cylinders 1 through 12 (dream on)
Learn from the Light!