I've got a 1995 Nissan Maxima. It started running rough, and the service engine light came on. The ECM codes indicated a multiple cylinder misfire and knock sensor. It did not indicate which cylinders had problems. To determine which ones they were, I removed the injector control wire from each cylinder while the engine was running, one at a time. The idle got rougher for every cylinder except for one, the front left cylinder (when looking at the engine while facing the front of the car). For good measure, I replaced the spark plugs on each of the three front cylinders. It made no difference. I switched the ignition coil of the offending cylinder, and did the injector control wire test again. Same result, seeming to point to a bad injector.
I removed the front fuel rail, in order to change the injector. After removing the retainer screws and cap from each injector, neither of the three will budge. The Chilton ervice manual I have says to simply remove the injector from the rail. I can spin them in place with a good deal of force. Anyone know what I am missing?
Thanks