Question about 1991 Toyota 4Runner

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1991 toyota 4runner sr5 3.0 v-6

Auto trans will not shift into 4 th or o.d untill it is at norm op temp then shifts norm. If it cools down while running it will not shift again. It acts like vacc. temp switch? can you tell me where to look?
Thanks Chris

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  • caljef4fun Aug 19, 2008

    Here's the real deal. The trans is controlled by one of the temp sensors on the rear of the intake manifold. There's a "U" shaped bypass hose that you can barely accesss that goes bad, restricting flow to the sensors. The computer won't allow 4th(O.D.) or converter lock-up, below certain temps to allow for the catalytic converter to heat properly. You have impeded flow to your sensors more than likely. I have once seen a thermostat stuck open which caused overcooling & the same issue but my first description is more likely. This is a bear of a change but I'll put money there before all the other cockamammy stuf yay-hoo's will tell you. Jman

  • Anonymous Mar 24, 2014

    shifts into gear better once engine warms up



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I had the same problem after spending $500.00 for toyota to look at it they didnt fix it and suggested i it was the auto trans and i should get it overhauled costing thousands. i didnt believe them and started to do some of my own research into the problem. the coolant temp sensor at the rear of the intake manifold tells the ecu when the engine is at correct operating temp then allows the auto trans shift into overdrive. to rule out any problems with the auto trans i disconnected the plug to the temp sensor and went for a drive when the engine was cold and it shifted straight away into overdrive no problems. you can't leave this disconnected because the engine is hard to start when cold as the temp sensor also tells the ecu that it is cold and allows the cold start injector to inject more fuel into the engine on cold start overcome this i cut the wire to the sensor plug and installed a switch which i installed into the centre i start the car flick the swith use overdrive then swith back to normal after car has warmed up . engine fault light appers on dash when switched on but doesnt matter. i have had this modification for 2 years now no problems.

Posted on Sep 23, 2008

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I have a 1991 toyota SR-5 3.0 4x4. it will run ok when i first start it but after it warms up it spitts, spudders, and then conks out. i haven't a clue as to why it wont stay running after opperating temp or much when revved.What canthis be?

Posted on Feb 24, 2010

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possibly due to low trans fluid pressure. the cooler in the radiator may be plugged. to check, disconnect and bypass cooler with rubber line & clamps. drive 2-3 miles. shifting OK now? install auxillary cooler to bypass one in radiator. you can get one at auto-zone $30-$50. may just need fluid & filter change, but more likely it's the cooler. when they get plugged, either one, pressure drops alot.

Posted on Jul 02, 2008

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the trans will not allow overdrive until coolant reaches roughly 180 degrees, if the guage shows cool and the trans is not upshifting, or downshifts to third while driving. the problem is either a sticking (or missing) thermostat. follow the lower radiator hose to the engine and find the three 12mm nuts, remove these to get to it. a new toyota t-stat will have a little bleed valve on its face. position it upwards when installing. hope this is helpful.
P.S. Happy New Year

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