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Discussion Starter #1 (Edited)
I am the original owner of a 1987 MR2 Auto with 136,000 miles. Over the years I have had 2 problem with the transmission and both times when I talked to transmission shops there only solution was rebuild it. Had I listened to them the first time the rebuild would have not corrected the problem. The transmission would not shift into overdrive until I had driven at least 5 to 10 miles. This problem was solved by changing a stuck thermostat. Seems as though the computor will not let the transmission shift into overdrive untill it is fully warmed up.

The second problem was a little more scary. The transmission would not shift into low gear when I came to a stop. But I could manually shift it in to low and it would work fine. Then it started sparaticlly shifting from low gear to 4th gear skipping 2nd and 3rd., the rest of the time it shifted fine. Seemed to act up more when it sat for a week or 2. Ordered a set of 3 Solenoids, #1, #2 and overdrive around 150.00 and had them installed. Just a matter of dropping the pan like you were doing and oil and filter change, removing the old and bolting in the new.Transmission is now shifting like a new one. Problem solved.

It just amazes how nobody has the ability to diagnose and repair things, there only solution is just rebuild it. Hope this post saves somebody a buck and takes a rebuild away from one of those shops that cant fix anything without rebuilding it.
 

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It's the same with doctors. I went to several doctors, all of whom diagnosed me with a genetic disorder called psoriasis. Incurable. After many tests I ended up at the Mayo Clinic in Phoenix for treatment that didn't improve my situation.

After eight years of painful suffering I heard about a new laser treatment so I went to see the only doctor in Phoenix qualified on the process. He was an older guy - early sixties - and he took one look at me and told me my original diagnosis was completely wrong. Six weeks later, and one pill a day, I was permanently cured.

But it gets better. Prior to that time I had been diagnosed with suspected prostate cancer. They ran a quarter million dollars worth of tests and were about to commit to surgery on my prostate (with all that involves). Then I go to my flight doctor for an annual checkup. He gives me a clean bill of health except he notes I should really have my internal hernias fixed.

These were caused by a severe motorbike accidents almost ten years earlier. He found them by poking around with his fingers - found them even though the hernias were not visible externally. Two weeks later I have eight internal tears fixed, and that's the end of the prostate nightmare - turns out one of the hernias was pressing on the prostate.

Why didn't they find the problem earlier? Because none of the doctors had the hands-on skills of my flight doctor. So all the tests were done in a horizontal position - at which point the hernias were not pressuring my prostate.

So if at least a dozen doctors and specialists with years and years of training can't detect two simple conditions, what chance do you think auto mechanics have? As with all disciplines, for every brilliant practitioner there are maybe eight mediocre ones.
 

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The shops would rather bill for a complete overhaul. They are thinking big dollars instead of spending time to trouble shoot and repair a small dollar item. Then I have to wonder if they really put new parts into the transmissions.

Similar problem with my F250 and it's E4OD transmission. It would act like it was dropping out of gear at highway speeds into neutral. Turns out it was the indicator on the transmission selector shaft that tells the computer where you have the shift lever set. $80 part later the truck was like new again. A shop wanted a complete overhaul and that would cost more that the truck is worth. Ford-Truck.com is your friend!

The Auto transmission not going into OD has been discussed here many times and my Brother found his answer here on this forum about 10 years ago. It was not the thermostat, it was just taking a long time to come to temperature. MR2OC is your friend!

John
 

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Doctors, Lawyers, Auto mechanics, etc etc. Someone ALWAYS graduates at the bottom of the class. Professionals are no different than anyone else in the human race. Some truly want to find/trouble shoot problems in an honest way with regard to controlling cost and fixing the problem. Others simply are driven by self interest/easy money with no serious concern about their customers. Happens ALL THE TIME, in all professions.. The trick in life is to find the straight shooters/honest/talented people regardless of their status or profession. That's why we all like this forum (and other forums as well). It's a collective of like minded people who choose to help and serve as best we can without regard for monetary compensation. In doing so we all have been able to fix problems,learn, and save and use our money more wisely. Always use your mind before your wallet.
 

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thanks i have an auto and i am sure that will come up in the future.

you right after the pan is open everything is right there...also there is a write up somewhere on the net of a mk1 auto rebuild. if needed.

thanks again
 

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Same Problem

Plyscamp said:
...The transmission would not shift into overdrive until I had driven at least 5 to 10 miles. This problem was solved by changing a stuck thermostat. Seems as though the computor will not let the transmission shift into overdrive untill it is fully warmed up...
I currently have this problem with my 86 automatic. Good to know, I might have to get that done.
 

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Thanks - that is exactly what my '88 auto SC is doing. Did you get a warning flash on your dash (mine is flashing the O/D light sometimes)?
 

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Plyscamp said:
It just amazes how nobody has the ability to diagnose and repair things, there only solution is just rebuild it. Hope this post saves somebody a buck and takes a rebuild away from one of those shops that cant fix anything without rebuilding it.
You are so right. Mechanics are sadly being replaced by technicians. The industry is over saturated with incompetent parts swappers. Nobody repairs anything anymore.

At my shop we still rebuild master cylinders, brake calipers, power steering pumps and gears you name it. We repair rather than replace whenever possible.

What really gets me is the shops that refuse to do this. I mean if a 14 year old kid in Mexico can rebuild a power steering pump why can't a professional mechanic.
 

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DaveP said:
Thanks - that is exactly what my '88 auto SC is doing. Did you get a warning flash on your dash (mine is flashing the O/D light sometimes)?
Did the solenoids on a mates SW auto recently and that showed codes by flashing O/D light. Page AT 23 in AW11 BGB May help.
 

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Thanks - it sounds like replacing the solenoids would have a good chance of fixing it. I think I'll give it a shot...
 

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I will have to check these in my trans, once my broken arm heals. Could you post a pic or explain where the temp sensor/ thermostat is located, that you referred to? My engine warms up properly, but will not shift into OD at all, won't shift into 3rd until after engine is warmed up.
 

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Well, the solenoids seem to have fixed my problem. I found a set for a little over $100 from ElectricalAdvantage.net - I wish I had tackled this earlier.

The hard part was cleaning up the xmission fluid that went everywhere when broke the pan free from the transmission.

Tonkatoy, the test to see if that's a mechanical problem with your transmission is simple. Disconnect the transmission controller and shift manually. It should go 1, 2, and D will put it into 4th gear (skips 3rd). If that works, it's probably something electronic. It won't shift into OD until the engine heats up - mine takes way too long since the cooling fan runs all the time. I'd like to find a switch that works at a lower temp.
 

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DaveP said:
It won't shift into OD until the engine heats up - mine takes way too long since the cooling fan runs all the time. I'd like to find a switch that works at a lower temp.
Why not just fix the cooling fan? :)
 

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tonkatoy93 said:
I will have to check these in my trans, once my broken arm heals. Could you post a pic or explain where the temp sensor/ thermostat is located, that you referred to? My engine warms up properly, but will not shift into OD at all, won't shift into 3rd until after engine is warmed up.
The thermostat is on top of the tranny. Look for the heater hoses going into a common area.

However, not going into 3rd in is not a thermosta problem.
If it won't ever go into overdrive, check your overdrive lockout switch.
 

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OD switch is non-op. unable to get circuit closed. Switch broke so OD is enabled (correct?). Before it broke, when the switch was working, OD off was the "closed" position, and lit the LED in the cluster. I have not attempted to cross the wires leading to the switch to test. I may need to try this when it does shift into 3rd, to see if it kicks it back to 2nd. I think my transmission may be very confused. Or, is it me? haha

And as for the thermostat, you are referring to the engine coolant thermostat, correct? Yes, that is working properly. Engine warms up within 3-4 minutes and maintains normal temp.
 

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rmeller said:
Why not just fix the cooling fan? :)
Easier said than done. I've tried a bunch of things, and I'm starting to think that I've got a broken wire somewhere in the maze of wires & switches that are connected to the fan. And are allegedly linked to the AC.

Got any ideas?
 

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Well, I got tired of waiting and went ahead and replaced all 3 solenoids in my trans, filter and fluid change. All of the crossover tubes are still securely in place, fluid looked and smelled clean, filter was also clean. Reverse still will not engage, will not shift out of second until after the engine is up to normal operating temp, will still not shift into OD, and the torque converter still locks at cruise speed. I guess I am going to have to swap in the other transmission. That WILL have to wait... The only other thing I can think that may be happening may be some problem with the internal governor not functioning properly. But that would require opening the main case, and might as well do a full rebuild, then.
 
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