Since your first gen you can build a datalogger pretty cheaply (if you search around there's a lot of information on it). With the datalogger (running MMCD) you can turn on and off each injector individually. If you try and turn off an injector and do not notice any difference in the way that the engine is running then you know that, that cylinder is the one that has the problem.
This is not 100% full proof for testing that the problem is an injector, but it will guarantee you which cylinder the problem is with so that you don't half to try and check each one individually.
um i know this thread is old but what else can you check to see whats causing the cylinder to be going bad? i checked cylinder 5 is the problem, but replaced spark plugs, coil pack, and checked wires but nothing....im thinking of putting the tt fuel injectors that i have laying around on my SL but what else could cause this problem?
With bad spark plugs does that make the engine run slugish? In any gear it runs good but as slow as a damm sentra if my foot is light on the pedal, but as soon as I stomp on it I can hear the engine rumble (no shaking) but the car does not go fast ive been driving it like this for about a year, do you guys think its a as simple as the spark plugs? It also smokes when the car is on idle after like 4 min?
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