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Found 1 result

  1. Darkmeat
    Got a bit of an issue. 2 days ago I noticed my motor is making a noticeable 'clackkk' sound at 1500rpm, under no load. I only noticed it because I was standing beside the car, with the bonnet open, gently revving the motor. The 'clackkk' sound comes from the top of the motor (not from the front under the cam chain cover) and occurs whether I stab the throttle or increase revs gradually. It happens as it passes through 1500rpm. It's predictable and repeatable. I've never heard this sound while inside the car with the bonnet closed. So I don't know if it's happening while driving and/or with the engine under load. I thought, since it happens only at 1500rpm, that it might be the CVCT system. But that is Continuously Variable. So I'm thinking there should be no single point or RPM value at which the VCT 'switches' the timing. Car is an NM35 with VQ25DET, Hypergear turbo, all supporting cooling, exhaust, & fuel mods for 270kw atw, inc. lots of Scotty parts, and eManage Ultimate ECU. Can anyone help me with knowledge, experience, diagnostic advice?
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