Subject	I can hear a change in noise when you activate the VTC, but
Posted by	LitlElvis on May 11, 2020 at 10:58 AM
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In Reply To	Here's forcing VTC on posted by BlackholeZ on May 08, 2020 at 03:02 PM
Message	it sounds more like injector clicking to me. I'm certain it is not the VTC that is making the noise. When activated, there just isn't any way they can make noise because oil pressure is pushing against everything... it's like a hydraulic cylinder at full stroke and the VTC's internal moving parts cannot move in this situation. You may be hearing something that is oil pressure related, since when the VTCs are off the system is bleeding oil pressure out the back of the intake cams. When the VTCs are activated there will be a slight increase in oil pressure which might manifest a noise somewhere else or change the tone/volume of an existing noise. Your original post mentions the noise happening between shifts while at med/low-RPM driving - have you tried driving with the VTC activated full-time to see if the noise remains?
Follow Ups	Trying to diagnose VTC noise - BlackholeZ 12:56:19 05/08/20 I couldn't hear shit in the video, I must be getting old and - itsa300zx 14:20:23 05/08/20 Yeah unfortunately it's pretty faint. - BlackholeZ 14:41:22 05/08/20 Here's forcing VTC on - BlackholeZ 15:02:08 05/08/20 It's very faint in the video but the first thing that... - DVDBURN (MD) 19:16:44 05/08/20 Re: It's very faint in the video but the first thing that... - BlackholeZ 21:36:33 05/08/20 I can hear a change in noise when you activate the VTC, but - LitlElvis 10:58:23 05/11/20 I agree it could be related to the change in oil pressure - BlackholeZ 18:42:02 05/12/20 Z1 motor sells HD springs for the VTCs. - mrchips 07:25:48 05/14/20 My message went mia. Maybe your springs are weak/broken caus - mrchips 07:30:00 05/14/20 It's actually been doing this for a long time. - BlackholeZ 16:44:54 05/14/20
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