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TrackRunner · 04-28-2008, 11:22 AM

jrock: I was having open loop issues with my 4Runner as well. I could only get into open loop if i was WOT (WOT registered as 75% throttle position on my scanner btw). You may want to try swapping your throttle body assembly (sensors and all) with a friend if you can. That way you don't waste a lot of time & money replacing sensors that work fine (what I did lol). Fortunately, there may be a solution for you out there even if you cant fix your TPS issue. URD just sold me a 02 calibrator made for later year 4runners that have two 02 sensors. Once installed, this little box really made the difference for me.

Before: 14.7 AFR all the way from 20in. Hg to 8PSI of boost.

With the 02 calibrator: 14.7 AFR all the way from 20in. Hg to 0PSI. From 1PSI to 8PSI the fuel gradually gets richer down to 12.1 AFR.

(I never went WOT for these results, and my truck stays in closed loop for the duration of the runs)

I just put the 02 calibrator on last Friday, so I am still testing it out. URD should be putting it up on their website soon as well. Good luck!

04-28-2008, 11:22 AM	#5 (permalink)
TrackRunner Registered User Join Date: Jan 2007 Location: relocated to LA Posts: 98	jrock: I was having open loop issues with my 4Runner as well. I could only get into open loop if i was WOT (WOT registered as 75% throttle position on my scanner btw). You may want to try swapping your throttle body assembly (sensors and all) with a friend if you can. That way you don't waste a lot of time & money replacing sensors that work fine (what I did lol). Fortunately, there may be a solution for you out there even if you cant fix your TPS issue. URD just sold me a 02 calibrator made for later year 4runners that have two 02 sensors. Once installed, this little box really made the difference for me. Before: 14.7 AFR all the way from 20in. Hg to 8PSI of boost. With the 02 calibrator: 14.7 AFR all the way from 20in. Hg to 0PSI. From 1PSI to 8PSI the fuel gradually gets richer down to 12.1 AFR. (I never went WOT for these results, and my truck stays in closed loop for the duration of the runs) I just put the 02 calibrator on last Friday, so I am still testing it out. URD should be putting it up on their website soon as well. Good luck! __________________ My Profile - 2000 4Runner SR5 - V6 S/C - URD Fuel Upgrade Kit - 2.2" Pulley - Clarion MAX675VD Last edited by TrackRunner; 04-28-2008 at 11:26 AM.