ISPKI Posted May 17, 2013 Share Posted May 17, 2013 Hello gents! After replacing the intake/exhaust manifold gasket, sensors, thermostat housing, wiring, injector harness and generally cleaning up and organizing the entire fuel rail area, I am finally at the point where I can start up my 77 280z again. The problem is that there is an open threaded hole on the intake manifold and I can not figure out what went there. There doesnt seem to be anything left that is not plugged in so I am thinking that it may have been plugged but would like to confirm before I try and start it. I have viewed numerous photos online and in the FSM and I cannot figure out what this thing is/was for. Attached is a photo of the hole, circled in red... Quote Link to comment Share on other sites More sharing options...
ISPKI Posted May 17, 2013 Author Share Posted May 17, 2013 Also - Just another bit of information. I am fairly certain that this intake manifold was off a vehicle with a manual transmission as it had several components found only on MT vehicles (according to the FSM). These were all disconnected but still bolted onto the throttle body and thermostat housing. Quote Link to comment Share on other sites More sharing options...
Domzs Posted May 17, 2013 Share Posted May 17, 2013 My 78 intake doesn't have a hole there . Does it go through the intake ? Quote Link to comment Share on other sites More sharing options...
ISPKI Posted May 17, 2013 Author Share Posted May 17, 2013 It does indeed, it goes through into the chamber. Sort of an odd place for a vacuum fitting being all the way over in one of the intake ports. All the other vacuum fittings are in the main plenum chamber. Any intake manifold that I have seen does not have a hole there or kinda sort looks like it is plugged with a bolt or something, but I cant find any really solid photos of that spot. Quote Link to comment Share on other sites More sharing options...
NewZed Posted May 17, 2013 Share Posted May 17, 2013 My stock 76 with factory AC just has a bolt in that hole. Looks factory installed. N42 intake. Quote Link to comment Share on other sites More sharing options...
OldAndyAndTheSea Posted May 17, 2013 Share Posted May 17, 2013 My stock 76 with factory AC just has a bolt in that hole. Looks factory installed. N42 intake. My stock 76 with factory AC just has a bolt in that hole. Looks factory installed. N42 intake. Same went for my non egr n42 intake. Until I shaved it that is. Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted May 17, 2013 Share Posted May 17, 2013 If it goes through to the port it will be common pipe thread.You can get brass plugs at any hardware store.If it was a mounting boss for something it wont go into the port and will have a straight thread for a bolt-and wont need to be plugged Quote Link to comment Share on other sites More sharing options...
ISPKI Posted May 17, 2013 Author Share Posted May 17, 2013 Im just going to plug it up and see how she runs. Quote Link to comment Share on other sites More sharing options...
Pasquale Posted May 23, 2013 Share Posted May 23, 2013 its not O-ring boss it would have a groove cut into the first thread where the o-ring would seat. Most likely its Japanes Standard Pipe or British Standard Pipe which you might have better luck finding on the internet. Quote Link to comment Share on other sites More sharing options...
ISPKI Posted May 24, 2013 Author Share Posted May 24, 2013 It was 1/8 NPT = /. The guys at my local Car Quest found a brass fitting that fit, although I did have to clean up the threads a little bit. Quote Link to comment Share on other sites More sharing options...
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