The "classic" ISB symptoms on an earlier (88-91) Civic/CRX are as follows:
- Rattle noise in neutral with the clutch pedal not pressed
- Press the pedal, the noise slows down and stops
- The noise may also be heard in gear
Replacing the ISB isn't awful, but it means removing the transmission from the car and pulling the transmission case apart. And then pulling the input shaft seal and then bearing out, which requires a puller. (I know some who say they've done it with a screwdriver; I couldn't figure out how to do that without destroying the bore they ride in.)
Noise #1 sounds a little like detonation ("pinging"). Which in my non-Honda, sounded kind of like a "spitting rattle" noise, not a metallic "ping". If your engine is on the edge of detonation, moderate loads and medium RPMs and warm temperatures would be the most common times for it to happen.
-soD
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