Question about 1991 Toyota 4Runner

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90 toyota 4 runner over rev'ing

Hi my dad has referred me to you, could you help me with the problem with my 91 toyota 4runner? It is a V6 3.0L 4x4 automatic transmission. The engine is a 22R-E and the transmission is A340F which i believe is stock for the 91 toyota 4runner. The problem started when i was going out of down and was driving for hours on the highway, before that i didn't notice it so i can't say it wasn't there before then. I was driving down the highway for only a few minutes, maybe 4 or 5 minutes and suddenly my RPM would go up. It was sitting at about 2500 going about 100km/h down the highway then it went up to about 3700 going same speed. I have tried many things to try and fix it, i turned my O/D switch on and off, i also switched into neutral while going down the highway, waited for the RPM to drop down under 1000RPM then switch back into neutral but still went back up to 3700RPM, i also tried to speed up to 120/125km/h thinking it might gear up but did not, and RPM would reach 4200RPM. Also my fuel consumption is outrageous, i am using twice as much as i should be. I getting about 200km on a 60L tank of gas. I have changed my throttle position sensor, and my coolant temperature sensor. I have checked for proper transmission fluid and radiator fluid amounts. It has been hesitating for about a second when i am completely stopped. But does not hesitate every time. Over the last week it has gotten worse, it no longer jumps up while driving down the highway, when i go up to 100km/h it is at 3600RPM almost like whatever was the problem has stopped working entirely. And the hesitation has been getting alot worse yesterday i had it hesitate for about 2-3 seconds. My dad rigged me up a wire with clips/fuses and a button to activate my error codes while driving because i was not getting any codes while i was parked. So while driving at 100km/h i pushed the button to activate the error codes and my O/D light began to blink constantly(no codes) and my check engine light blinked with error codes 41 and 51. 41 is the THROTTLE POSITION SENSOR SIGNAL--OPEN OR SHORT INtps SIGNAL--tps SENSOR --tps SIGNAL/CIRCUIT --ECU and 51 is SWITCH SIGNALS IDL (tps) CONTACTS OFF, NEUTRAL START SWITCH OFF, A/CSWITCH "ON" SIGNAL TO ECU WITH DIAGNOSTIC CHECK CONNECTOR SHORTED --A/C SWITCH/CIRCUIT --A/C AMPLIFIER --TPS/CIRCUIT --NEUTRAL START SWITCH/CIRCUIT --ECU But i think that #51 was coming up because i was driving and not in park. I have also replaced a donut that was in my exhaust pipe before my Catalytic converter. I think that is about all, if there is anything you can think of would be greatly appriciated, thank you kevin i have a 91 4runner and my truck before would rev up high and then go back to normal and then do it a couple of more times then it would be fine but now it will not go into overdrive or the kickdown gear (passing gear) is not working i think its the TPS

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Is your ECT Power switched on this causes higher revs

Posted on May 27, 2009

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The problem is that I need to check the connections on the catalytic converter.

Thank you for the tip


Posted on May 10, 2010


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SOURCE: 90 toyota 4 runner over rev'ing

Go ahead, get the TPS close, we'll final adjust it later.

Posted on Oct 17, 2008

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SOURCE: i my dad has referred

It sounds like it is kicking out of overdrive. Many code scanners sold by auto parts retailers will not read manufacture transmission codes. I had this issue with my Ford Contour. The o/d light would flash but I couldn't get any codes from it with an Actron scanner, which is similar to what you find in parts stores. I used a tuning device (SCT Xcal) loaded with Ford software and that pulled the codes for me. If you are getting a VSS code, that is a good place to start. The computer uses this sensor to know how fast you are going so it can select the proper gear. If it doesn't know how fast you are going, it tries to guess based on your RPM. It wouldn't surprise me if it got stuck in first gear. The exact VSS code you get would help but I think you are going to need to replace that sensor.

Posted on Nov 17, 2010

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