| :Although its *possible* the intake cam gears are fine, its completely unlikely. VTC wear is a common issue with Z32 owners. Most common band aid is JWT high pressure springs, actual fix is replacing the gears (with known good or BDE gears). I've personally tried the JWT springs in an attempt to fix noisy sprockets and found them to be ineffective. The sprockets can become noisy with age and/or increased valve spring pressure (in my case both) :Your VTC solenoid may also be broken, but the frog rattle is coming from the worn VTC system in the intake cam gears. Agreed. People often think they can diagnose bad sprockets by unplugging the VTC solenoids, not realizing that they are turned off at idle anyways. The green/black wire must be grounded while everything is plugged in to actuate the solenoids (or they can be actuated with conzult, blazt, or the software of your choice). :And yes, it can be done in the car fairly easily (although it is labor intensive) yep, you must pull the intake manifold in order to pull the intake valve covers to remove/replace the solenoids
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