Question about 1991 Toyota Pickup
My 91 Toyota pickup has a problem with the thermowax idle valve...it sticks part of the way open, causing an idle surge....is there an easy fix for this? I was told I would have to replace the whole throttle body assembly.
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Posted on Jan 02, 2017
SOURCE: Ls400 Throttle Body Plate
The Jam nut adjusts the throttle plate. Be careful when playing with that cos if you go out of the "range" of the accelerator position sensor the throttle will stop responding
The other (screw) is to set the maximum range of throttle movement (WOT and closed)
Posted on Dec 09, 2008
it sounds like the injectors are not opening up man.. replace the injectores and this should fix your problem..good luck keith....
Posted on Mar 21, 2009
I think the terms "Throttle Positon Sensor", TPS and "Throttle Body" can be misleading at least in regards to the 04 Camry.
My 04 Camry gave a diagnostic reading of P2121 for my problem "Throttle PEDAL position switch D circuit". However, we changed out the complete Throttle Body/TPS (Toyota Part #22030-0H020) that did NOT fix problem.
The 04 Camry TPS Electronic Module "Throttle Positon Sensor" is factory assembled and riveted to the side of the throttle body. The only way to service/inspect it would be to cut off or drill out the rivets. Not sure you could open the darn thing if you got it off, but that seems to be the only way Toyota sells them!!
Hopefully a new Throttle PEDAL Position Sensor (Toyota Part # 78010-33010 PEDAL ASSY, ACC)
will fix it. This is located under the dash near the accelerator pedal.
So, now I would recommend FIRST to replace the "Throttle PEDAL Positon Sensor" (it is much, much cheaper) and then the Throttle Body/TPS assembly!! Unless of course, you get a diagnostic code as you did for "faulty throttle body!!
Posted on Jan 21, 2010
Not 100% sure on your exact car but nissan TPS usually are on the opposite side of the TB from the butterfly return spring.
Posted on Mar 09, 2010
Testimonial: "thanks a million no information on installing & adjusting in repair manuel"
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The Idle Air Control Bypass Air (IAC BPA) valve consists of an idle air control valve and a bypass air valve. The bypass air valve functions during cold engine conditions to increase engine idle speed. It consists of a thermowax bead and a valve.
Engine coolant is directed around the thermowax, which opens and closes the valve. During cold engine operation below 140°F (60°C), the thermowax is contracted enough to allow the valve to open. As the coolant heats, the thermowax begins to expand. When the coolant reaches temperatures above 140°F (60°C), the thermowax expands and closes the valve.
The valve controls the amount of throttle valve bypass, which ensures a smooth idle under all engine operating conditions.
TESTING See Figures 1, 2 and 3 (if you don't have an ohmmeter, skip this test)
Fig. Fig. 2: Connect an ohmmeter to the IAC valve; the resistance should be 7.7-9.3 ohms
At this point, if your IAC checks good, I recommend you take out the 4 screws seen above, remove the motor, and clean out the air passages/valve with carb cleaner. Also remove the big (3 inch diameter) hose from the throttle and clean out the throttle body, if dirty.
If the IAC tests bad, go to the removal and installation directions below.
The next test requires a scanner. If you don't have a scanner, skip this test.
Fig. Fig. 3: Idle Air Control Bypass Air (IAC BPA) valve assembly components
REMOVAL & INSTALLATION
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