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 Write-Up: Northstar Throttle Body Install

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matt270avian
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PostSubject: Re: Write-Up: Northstar Throttle Body Install   Sun Nov 23, 2014 11:49 pm

Grabbed a Denso 234-4012, will be here Tuesday. Will spray the existing one with PB tomorrow and Tuesday to make life easier.

Does anyone think I should throw in my OEM MAF (same p/n as the N*) and flash the tune I had before installing the N* to see what happens?
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turtleman
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PostSubject: Re: Write-Up: Northstar Throttle Body Install   Tue Nov 25, 2014 12:33 am

The sensor that came along with the northstar setup has the same part number as your oem one? I don't know if I ever looked into that.
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matt270avian
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PostSubject: Re: Write-Up: Northstar Throttle Body Install   Tue Nov 25, 2014 12:45 am

turtleman wrote:
The sensor that came along with the northstar setup has the same part number as your oem one? I don't know if I ever looked into that.

Yep. Parts stores don't show it but they are indeed the same exact sensor (96-98 L67 = 96-99 N*) The reason the usually don't show up together is because most places want you to buy the whole plastic housing with the MAF for the N* while they only want you to get the sensor for the L67. I can even take a picture of the 2 side by side so you can see that they are the exact same ones if you would like.
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matt270avian
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PostSubject: Re: Write-Up: Northstar Throttle Body Install   Tue Nov 25, 2014 3:21 pm

New sensor is in, going to get a good scan whenever I go back out. Should I re-enable the stock PE settings, or leave them at 100%?
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matt270avian
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PostSubject: Re: Write-Up: Northstar Throttle Body Install   Wed Nov 26, 2014 7:21 pm

Well I found a guy on GP forums with pretty much exactly the same issue as me, only he has the 72mm zzp stage 2 body. Another guy said just to bump the stock tables up 25% and start from there. Wouldn't you know it? Knock is mostly gone.
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charlieRobinson
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PostSubject: Re: Write-Up: Northstar Throttle Body Install   Tue May 05, 2015 11:14 am

deekster_caddy wrote:
Will it start if you unplug the MAF sensor? Is the IAC opening?
Also, you may need to adjust the idle set screw. The IAC should technically take care of it but on mine I had to increase the stop a bit to get the idle smoothed out.

Would the idle set screw on a northstar TB set the stage for lean fuel trims at zero throttle? should it be backed out a bit to adjust for the 3800 idle and cruise?
Seeing lean trims at 0 throttle and cannot find a vac leak. Scraping for anything else I can check. dunce study
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matt270avian
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PostSubject: Re: Write-Up: Northstar Throttle Body Install   Tue May 05, 2015 11:35 am

When I did mine I just had to start/drive it a few times and it learned itself. Fuel trims were still a bit off until I dicked with them, but it finally started to idle/run right after a couple days.
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