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Haris. Houston, Texas. University student and motorhead.

If you having a rod bearing on it’s way out it can make a clacking/slapping metal sound that gradually gets worse (especially under load). Sometimes it can be difficult to hear/isolate the noise. Most of the time you will see a pressure drop on the z32s oil pressure gauge. You can pull the coil packs one by one and listen for a change in sound. You can also check the oil and filter for metal debris.