Question about 1985 Toyota 4Runner

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Cuts out at mid range rpm

I have an 85 Toyota 4Runner which had an automatic and i just put a 5spd manual transmission in it. Im not sure if one of the 5 different plugs that went to the automatic need something done to them but at idle and full throttle its fine but mid range rpm it cuts out. Any ideas

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  • tjrussell78 May 24, 2009

    no vacum lines were removed during the conversion. There is 5 plugs that went from the fuel injection harness down to the transmission. I know that one of the wires go to reverse lights and one goes to the cold start injector. I dont know if any of the other wires needed to be looped or what shoud be done with them. Im thinking it has something to do with these wires because thats about the only thing that isnt hooked up the way it was before.

  • tjrussell78 May 26, 2009

    ive already went through the chiltons manual and the colors of the wires that go to the auto tranny dont match up with the wiring diagram in the manual. I looked at the wiring diagrams for four different years and none match up color wise except for the backup light wire.I know that if i get an ecu and wiring harness from a manual trans truck it will work but i dont want to do that until i've exhausted all other options. Automatic was sold before i even had the manual tranny in.

  • tjrussell78 May 26, 2009

    i know how to work on cars and ive had a couple buddys that worked at dealerships for years and still are stumped. I already reajusted the timing. I doesnt have points the distributer is electronic and has no points. Timing is not an issue. The only thing that isnt the same is the plugs that went from the fuel injection harness down to the transmission are just hangin there. There is 5 plugs that went to the automatic tranny - (1 clear round 3pin plug w/ black wire, black w/ white stripe, and red w/ blue stripe) (1 white round 6 pin plug w/ only three pins in use blue wire, red and green) (1 black oval 2 pin plug w/ green w/ black stripe wire and green w/ yellow stripe) (1 clear rectangle 6 pin plug w/ brown wire, yellow, white, black, whte w/ black stripe, and green w/ red stripe) (1 white triangle 3 pin plug w/ white w/ black stripe wire, light green, and yellow w/ red stripe) I have troubleshooted a little and figured out that on the clear round 3pin plug the red wire w/ blue stripe is for backup light and the black wire has something to do with the cold start injector. I've looked in the manual but the only wire that is the same is the backup light wire but the other color wires dont match up.

  • Ned C Cook
    Ned C Cook May 11, 2010

    did you eliminate and plug the modulator vacuum port?



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I wouldn't loop them without knowing what their purpose was. they were probably gear sensors and talked to the ECU WHICH IN TURN CONTROLLED THE FUELING look on the trans you removed or a manual that will identify all sensors , locations and function.. You can get a manual at the parts store.
The ECU may need coding for a manual transmission. Look deeper into it. Good luck. I'll do some digging as well and let you know what I can find. . Let me know your findings,ok?

Posted on May 24, 2009

  • 1 more comment 
  • Ned C Cook
    Ned C Cook May 26, 2009

    can you trace them back to the engine and identify where they are cinnwcted?

  • Ned C Cook
    Ned C Cook May 26, 2009

    Did you make any engine timing or carb adjustments for the manual trans? They all have to be readjusted because of the sifferences.. Chilton has the specs for timing and idle speeds for several toyota egines, but the timng is the most important setting, then the carb setting. Get your mind off the connectors untill the other settings are made. Find the engine you have and go by the specs for manual trans. Your timing is importantant and if this unit has points the dwell must be properly set to 52-54 degreegrees before setting the timing. Set timing w/ vacuum advance disconnected and plugged. Note the timing difference is 5 degrees.. good luck luck and keep in touch.

  • Ned C Cook
    Ned C Cook May 26, 2009

    As in any conversion this is a situation where the only thing left to do is chear! Go to a salvage yard and find out what those wires or where they were connected on the trans (auto) then find a stick shift snd see what it csalls for.. You can also go to a speed shop and get info from them. They are usually good at helping fellow off roaders. Dealers won't talk to you constructively.. good l;uck my froend.



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1 Answer

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Here is the switch for a manual transmission.

Location below.


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