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1991 V6 Auto Transmission

Transmission will not go into Overdrive unless the engine is warm. Challenge is during freeway driving, the truck runs real cool unless it is stop and go traffic. Any solutions other then replacing the transmission?

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  • 89 Answers

Tranny cooler ?

Posted on Oct 20, 2013

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Posted on Jan 02, 2017

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SOURCE: 1992 Mitsubishi Eclipse transmission slips in overdrive

well the low cost way to go first would be to try and change the trans fluids. If the problems still remains the it may be an internal problem

Posted on Feb 25, 2009

  • 14 Answers

SOURCE: how to use the overdrive on the auto.transmission.

the overdrive button on your automatic transmission is for cruising on the highway basically like having another gear for better economy careful not to use it when your not on the highway because lugging the car in overdrive when its not needed will cause higher fuel consumption other than that you should have no problems just get out on the highway and push and away you go

Posted on May 31, 2009

wracefans24
  • 1985 Answers

SOURCE: I have a 1999 dodge ram with an automatic

Have you replaced the transmission filter and fluid yet,
if your transmission works ok until it heats up,your transmission external cooler may be plugging up getting the transmission fluid to hot and not cooling it at all.It is located in front of your A/C and radiator.you can replace it with an after market one or have it flushed.
and you might want to put in an additive for the transmission made my Lucas.

Posted on Dec 17, 2009

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My 1991 v6 4 runner auto has a flashing overdrive light on the dash. Most of the time it skips 2nd witch makes it sluggish. I plugged in a diagnostics link and get a fault message comming up on the...


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1991 toyota 4runner sr5 3.0 v-6


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 up.to overcome this i cut the wire to the sensor plug and installed a switch which i installed into the centre console.now 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.

Jul 01, 2008 | 1991 Toyota 4Runner

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