Quote:
Originally Posted by 94cobra69ss396
Listen with a broom handle, stethoscope, screwdriver and see if you can determine where the sound is coming from. I don't know anything about the LS cam issue but if it's a rod knocking it will be the loudest under a heavy load. Since you have a manual trans the only way to load the engine is by driving it. Just get out on the main street and put it in third at a lower rpm and give it some throttle. If it's a rod issue it will rattle loud.
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I can tell that's exactly the kind of conditions under which it makes the most noise. Coming home on the freeway when I first heard it I slowed down a bit and tried to cost and just nudge it. Whenever nudging it would get louder, when costing it didn't make any sound.
I'll try to double confirm with a stethoscope that it's coming from the pan area. Assuming that's it, I guess this is a matter of draining the oil (needs an oil change anyway thankfully) and removing the pan to see the rod connections to the crank.