you do know then just because you replace a rod that was knocking doesnt mean it fixed the problem right? anyway, heres a way to tell, go start your car and while its idling...pull the spark plug from the #1 cylinder if the knocking stops you have a spun rod bearing(repeat this with cylinders #2-4, but be careful, you can get shocked easily if you arent) anyway only disconnect one plug at a time, but like I said if the knocking stops after any cylinder, you have a spun rod bearing, by pulling the plug, you are removing the spark, which takes the load off the piston/rod assembly, chances are if it sounds like a rod knock, then it is, that is assuming you know what a rod knock sounds like