Quote:
Originally Posted by vasillalov
You don't really need INPA to figure this one out. Say you suspect that injector 1 is bad because you are getting misfires, but you are not sure:
1. You swap the coils and spark plugs between cyl 1 and cyl 4.
2. If the misfire moves with to cyl 4, then its the coil or the spark plug
3. If the misfire remains on cyl 1, then its the injector
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If a code was thrown, it would be as straight forward as you say. But what if the injector was not bad enough to cause codes to be thrown? Is it possible that performance can be impaired without a code being thrown?