Throttle Body Disassembly?

Posted January 31, 201015 yr

Have any of you guys ever disassembled a throttle body from a 75. I'm talkin about completely! I need to take one apart as far as possible without getting it out of adjustment in order to completely clean and cosmetically restore it to better than new condition. Any ideas/suggestions?

Thanks

Bryan

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February 3, 201015 yr

comment_308428

Bryan,

Short of just using carb cleaner spray, you will have to loose your adjustment at the TPS if you want a complete breakdown for cleaning.

If you are to do a proper total breakdown, you would need to adjust the TPS and Idle Speed after cleaning anyway! This is not a big deal...

I would use a file to mark the present adjustment of the sides of the TPS, and then count the number of turns for the Idle Speed Screw as you remove it. These will be your baseline settings when you re-assemble.

Take the Throttle Body apart, making sure that you do not loose any screws from the flap. Make sure to be careful with the Throttle Return Spring - If it is rusty, replace it (these are VERY hard to find from Nissan though! :mad:). If there is a B.C.D.D. and it looks ok and seems to be working - LEAVE IT ALONE! Do not disassemble. Blast out the Throttle Body with Brake-Kleen and/or Carb Cleaner (Watch your eyes). Buff the throat and the flap with fine steel wool and re-assemble. Blast again with Brake-Kleen and/or Carb Cleaner (Watch your eyes- again :cry: ), follow up with compressed air - everywhere!

If you polish the Throttle Body, make sure that you get all of the compound out of the various ports/passages - compressed air would be very helpful with this too.

Reinstall the Idle Speed Screw and the TPS from the marks and settings you noted earlier. Find a FSM and/or the Fuel Injection Manual (Search the Forums), Start your Z and begin adjusting to the specs from the FSM. Check your settings again after the car has warmed up.

It is important to reset everything to the FSM Specs because the settings that you started with may no longer be appropriate for a clean and shiney Throttle Body.

So there you have it! Have fun!