Dude I had the same noise on my freshly rebuilt s14 sr was lucky I didn't float a valve somehow one of my shims that holds the rocker was gone lol and it was making that noise. Does it get higher with engine rev? Hopefully it's not that but sounds the same plus ur ears my deceive u I thought it was on the last injector turned out to be on cylindr 2 intake side. Get a stethoscope and listen to it. Did it start out of no where? Or a recurring prob? GL
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