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Help engine fixing nock sensor

Hello good people of the 300zx forum I am in need of replacing the nock sensor, I have taken out the fuel injectors and under that is a block held down by 6 bolts however 2 of the bolts are hidden behind a steel pipe which I have no idea where it leads to so I'm asking does anyone know? Pictures are 84d41bbbecffe045c840e99f9ce7e849.jpg e2496feb204123ae4dadfd830c9a9bc5.jpge92fe8916f80fa1e0370e0c489097729.jpg5d02995189bf3dff7d035ff80dea2ad7.jpg

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    They are both for the cabin heater matrix matey2011-01-13_030006_95_300_back_of_engine_egr_loc.jpg

     

    They can be removed at the flange, 2 bolts each. The picture, although not the best shows you the location.

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    To avoid the plenum pull, you could relocate the knock sensor (search relocate knock sensor 300zx and you'll find loads of info). I had this done on my first silver TT http://www.angelfire.com/geek/vg30dett/DSR/DetSenRel01.html and there's other options http://twinturbo.net/nissan/300zx/forums/technical/view/786419/TECH-Detonation-Sensor-Relocation.html

    It's true that the OEM position is where Nissan wants it, but the above might give you some other options.

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