A rod knock would be noticeable at all rpms. You can't hear it at idle and only notice at the low rpm range.
Might check your idler pulley i think it is. Or the tensioner pulley. Some have posted of a broken spring. It's one place to look.
Another possibility might be the throwout bearing.
Have you tried to listen under the hood and pinpoint the exact area of the sound? Engine front or rear.
If need be. You can use some vacuum hose as a stethoscope. Put hose on direct contact you'll hear the noise loud and clear. Just don't be touching moving parts.
Might check your idler pulley i think it is. Or the tensioner pulley. Some have posted of a broken spring. It's one place to look.
Another possibility might be the throwout bearing.
Have you tried to listen under the hood and pinpoint the exact area of the sound? Engine front or rear.
If need be. You can use some vacuum hose as a stethoscope. Put hose on direct contact you'll hear the noise loud and clear. Just don't be touching moving parts.