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Ticking/knock

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Hello I need help with my 73 240z

is this rod bearing issue or leaky valve or what? 

thank you for your reply 

  • Author

Noise is coming from cylinder #1 and when I pull plug wire 1 it goes away

Have you done a valve adjustment? If not start with that and make sure the valve train looks good.

  • Author

Yes clearance was done according to manual. Will check valve train   Thanks Patcon

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