My 92 Chevy Lumina Z34 is making a noise coming from the area around the crankshaft pulley. On initial start-up, the noise is very quiet but once the engine warms up, it becomes very noticeable. To me, it doesn't sound like a typical rod knock but more like a loud tapping. The car runs great and idles very smoothly, it just has that noise.
The 3.4L Twin Dual Cam engine does not have a harmonic balancer.
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