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Old 02-23-2004, 08:56 AM   #1 (permalink)
Crazy
 
Location: MS
93 Toyota Corolla Motor HELP!!

I need some help, my brilliant wife decided that she would drive her car with no oil in it!! Which in turn burned the motor up. Here's my question.... I am getting another motor in it just until i can sell the car, but i want it fixed right. Do you have to replace the computer when you replace this engine??????? 4 cyl auto trans. I haven't a clue. Everything else is fine. Thanks for your help.
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Old 02-23-2004, 10:39 AM   #2 (permalink)
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Location: San Diego, CA.
as far as i know, as long as your using the same parts (engine, fuel injectors, transmission....everything) as you were before, the original computer should be just fine. Keep the same transmission though, as you might get into more work than you want if you hafta program the comp for new shift points, etc.
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Old 02-23-2004, 12:03 PM   #3 (permalink)
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Location: MS
Really the only thing that has to be replaced is the block! Tranny and everything else is fine and will stay in the car! Thanks
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Old 02-23-2004, 05:12 PM   #4 (permalink)
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Location: Grants Pass OR
a couple things to pay attention to, if the donor vehicle is the same year, and has the same type of transmission all should go smoothly, as long as you make sure that if the engine you are replacing is a california spec. engine that you replace it w/ a cal. spec. engine or if it's a federal spec. engine that you replace it w/ a federal spec. engine.
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Old 02-23-2004, 08:15 PM   #5 (permalink)
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Location: San Diego, CA.
I only know the california standars, but if you put a CA engine into a Fed certified car, i imagine it wouldn't cause a problem since were are so damn strict here.
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Old 02-24-2004, 07:44 AM   #6 (permalink)
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Location: Grants Pass OR
I wouldn't think it would either, except that the fed. spec. computer wouldn't know what to do w/ the extra emissions equipment, and that could cause a few issues.
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Old 02-26-2004, 08:26 AM   #7 (permalink)
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Location: MS
Thanks alot for your help. Now on to spend some time and money. Thanks Again!
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Old 02-26-2004, 11:52 PM   #8 (permalink)
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Location: Northwest Woods
Quote:
Originally posted by Peryn
Keep the same transmission though, as you might get into more work than you want if you hafta program the comp for new shift points, etc.
New shift Points??? we're talking about a 93 carolla here, automatic or manual, the ECU has no idea. Its only responsibity is the engine.
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Old 02-27-2004, 09:11 AM   #9 (permalink)
Junkie
 
Location: San Diego, CA.
I wouldn't bet on that. I had a 90 Dodge Caravan (not exactly the most advanced car for its day), and the transmission relied heavily on the ecu. You were supposed to take it out after disconnecting the battery, and train the transmission. It basically learned its shift points based on your driving habits. Now, could you drive it without doing that, yes, but it was very rough shifting and the shift points were all wacky for a while. But if your comp is trying to send out and receive signals like that, who knows what will happen if it sends them to a different transmission.
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Old 02-27-2004, 11:39 PM   #10 (permalink)
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Location: Northwest Woods
Peryn, were not "betting" on anything here; So check the facts on the corolla tranny. Even on an automatic, it does not "learn" shift points and niether did your Caravan. I cannot imagine what would make you think that. At most the computer is monitoring tail shaft speed and deciding when to lock up the converter, (not on the corolla). The only wiring on the corolla transmission pertains to the reverse switch and the oil level, on either the automatic or the manual. <BEGIN RANT> Folks on this board should really consider what they say before they say it... people are asking for advice and they are at your mercy. This isn't a measuring contest and its not an arena for bullshitting. ITS A PLACE TO HELP OTHERS OUT. Don't post for the sake of posting! <END RANT>
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Old 02-28-2004, 11:48 AM   #11 (permalink)
Junkie
 
Location: San Diego, CA.
Quote:
Folks on this board should really consider what they say before they say it... people are asking for advice and they are at your mercy. This isn't a measuring contest and its not an arena for bullshitting. ITS A PLACE TO HELP OTHERS OUT. Don't post for the sake of posting!
hey, i am just trying to help someone avoid problems to the best of my knowledge, so give the hostilities a break for a minute.



Quote:
Even on an automatic, it does not "learn" shift points and niether did your Caravan. I cannot imagine what would make you think that. At most the computer is monitoring tail shaft speed and deciding when to lock up the converter, (not on the corolla).
No. My caravan DID learn shift patterns, shift points, etc. as you were driving if you dont have a rack to stick it up on, and drive it with the tires in the air. And i DONT know about the corolla tranny, and it didn't sound like he did either. Hence the reason i was reccommending that he wont want to change it.


"The A604 is the first transmission to control the release of one gear and the apply of another without the use of bands or sprags. It programs its shifting operation by sampling the vehicle's operation pattern while it is being driven" - http://www.txchange.com/a604.htm

Having had to do this a number of times, i can confirm it. If the memory on the TCM gets wiped (such as disconnecting the battery while working on the car), you need to train the transmission. It will have rough shifts, slippage during shifting, and shift at wierd rpm ranges for the first several miles until it starts to learn. If you dont follow the learn procedure right, and are too heavy on the throttle, shift points tend to be higher until it has a chance to learn them properly. If you dont do this after swaping in a good transmission for a bad one, it can cause serious internal problems. following the old shift behavior, it can try and apply two gears at once, or have a long period of neutral between gears or other dangerous behavior. If you still dont believe that transmissions can learn this information, i can post teh procedure for you if you want.
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Old 02-28-2004, 10:59 PM   #12 (permalink)
Upright
 
Location: Northwest Woods
Peryn, stop while you can. As the page you linked to illustrates, the trany and the computer (ECU) have NOTHING to do with each other on your van and if you actually pay attention to what it says, it does NOT learn shift points. Your tansmission does have a transmission control module (TCM), whose purpose it is to activate the hydralic valves or servos that prompt a shift. To make the shift smooth, older model transmissions briefly held the car in 2 gears simultaneously during the shift. While most gave that up, Chrysler tried to re invent the idea, by adding the TCM. Unlike the those that do learn shift points and driving habits, i.e. the BMW SMG tranny, the late model torqueflite only measures the pressures for each valve in an attempt to try and estimate condition of the clutch bands, and compensate for thier wear.

Will one of the mechanics on this board please chime in???
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Old 02-29-2004, 01:06 PM   #13 (permalink)
Crazy
 
Location: Arizona
I had a 86 Celica GTS with a 3SGE motor in it. My dad and I replace the motor in a few weekends. All we did was pull the wiring, pull the old motor, dropped in the new, and took it to a shop to be tuned up a little. We didn't replace anything electric.
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Old 03-01-2004, 11:46 AM   #14 (permalink)
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Location: Tulsa, OK
There is no need to change the ECU as long as you put the same engine in. I believe the '93 Corolla used a 4a-fe engine. Just get a block from one of those (plentiful in junkyards where I live) and you're good.
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