TPS reading at WOT with 1ZZ throttle body? - Toyota Yaris Forums

Bluevitz-rs · 03-31-2013, 07:27 AM

I may sound counter-productive but try backing the idle screw off just to see what happens. Just one turn back.

tooter · 03-31-2013, 04:43 PM

Quote:

Originally Posted by Bluevitz-rs

I may sound counter-productive but try backing the idle screw off just to see what happens. Just one turn back.

Good advice, Blue.

That did the trick for me when I had the same issue.

June yaris · 06-07-2023, 08:33 AM

Quote:

Originally Posted by tooter

Good advice, Blue.

That did the trick for me when I had the same issue.

Where can I find that screw

Neinris · 06-07-2023, 01:45 PM

It's on one of the corners covered by some sort of glue to prevent it from backing out. You'd have to scrape it off to get access to it. It's an allen screw btw, I forgot what size it was, but mine stripped, to I hammered a torx screw driver into it and was able to back it out. I used blue loctite when I had the 1ZZ TB installed to prevent it from backing out.

My recommendation is, let your engine warm up for a good 10 minutes with the stock TB is still installed, then try to work quickly while the engine is still warm. Turn off the engine every time you make an adjustment. Once you're happy with the idle RPM (mine was set for 650-700rpm), turn off the engine and remove the negative cable off your battery and turn on your high beams to flash your ECM/ECU (I do it this way to remove all the juice from the capacitors in the system).
Even when you get the idle down perfectly, you will still have high RPM during cold starts, but will eventually die down even after about 30 seconds.

I've reverted back to the stock TB due to the rev hang, other than that, I was happy with how peppy it was.

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03-31-2013, 07:27 AM	#1
Bluevitz-rs 1NZ-6spd View User's Garage Drives: '05 6-Spd Vitz RS Join Date: Oct 2008 Location: Oshawa, Ontario, Canada Posts: 2,967	I may sound counter-productive but try backing the idle screw off just to see what happens. Just one turn back.

06-07-2023, 01:45 PM	#4
Neinris View User's Garage Drives: 08 Yaris 3 Door Hatchback Join Date: Aug 2019 Location: ‘Murica! Posts: 461	It's on one of the corners covered by some sort of glue to prevent it from backing out. You'd have to scrape it off to get access to it. It's an allen screw btw, I forgot what size it was, but mine stripped, to I hammered a torx screw driver into it and was able to back it out. I used blue loctite when I had the 1ZZ TB installed to prevent it from backing out. My recommendation is, let your engine warm up for a good 10 minutes with the stock TB is still installed, then try to work quickly while the engine is still warm. Turn off the engine every time you make an adjustment. Once you're happy with the idle RPM (mine was set for 650-700rpm), turn off the engine and remove the negative cable off your battery and turn on your high beams to flash your ECM/ECU (I do it this way to remove all the juice from the capacitors in the system). Even when you get the idle down perfectly, you will still have high RPM during cold starts, but will eventually die down even after about 30 seconds. I've reverted back to the stock TB due to the rev hang, other than that, I was happy with how peppy it was.