well terry has another one but its not the exactly correct ecu for my engine .. Also i didn't want to risk it , if its faulty as well or time assuming swapping around . or worse if it gets lost in the mail. 
So its best to repair instead. 

Yes that's right!
I did let him know what's wrong with it . But still he wants the ecu sent to him then he was going to send his other incorrect ecu back to me ( I didn't bother to ask if he wanted money for that)
Also you can't know if his other ecu working or faulty. I can't leave my car sitting at the workshop for another week . I need to have it running and ready for my rego this week .
I have emailed him re the update and politely ask him for some reimburse bill.

time for a reply from us...........
 
the customer decided to fit a used engine & LSD gearbox conversion beacuse they not want to spend $ to properly recondition their tired units. This does not qualify as "NEW" as suggested in 1st message
 
other work was done apart from just fitting a used engine & box. eg fixing air con.
 
the engine , loom & ECU was removed from a car some months previously and ran fine. we checked compression, oil pressure ,etc to satisfy ourselves it was fit for re-use. our clearly started (written) warranty was against major internal mechanical fault. 
 
the customer test drove the car at hand-over and went fine.
 
a few days later there was a complaint over erratic idling. we got it back and checked/re-set everything relevant. several hours work. no charge to customer.
 
the email trail over this job indicated the car had experienced idling problem in the past and that was linked to a/c use. we could find no fault in this regard as the air-con idel valve appeared to work as intended
 
after various emails, customer agreed to have us order a new  throttlebody idle control valve which she would pay for and  we would fit at no charge. 
 
after a couple of months, Toyota still could not supply (still a good part number, but zero stock in japan). ciustomer emails and tells us to cancel order, which we do
 
customer starts this complaint thread
 
customer emails and says car is broken down, been advised dead ECU. I chase around and find same generation 4 plug ECU but from UK spec car. I organsie to get this , remove cover, check it seems OK. I email and ask for old ECU to be sent to me to double check the pin out. I also call and talk to Toyota dealer handling it and tell them the same thing.
 
No reply from owner or Toyota, but owner clearly sees fit to advise everyone else via this forum, with a clear aim of discrediting us. 
 
whislt all businesses dont have a 100% success rate, we are getting a bit tired of unreasonable complaints especially dealing with used parts. 
 
finally, we would suggest all the stakeholders , including the forum moderators, you get a real clear understanding of the laws related to defamation and your personal liabilites. there are already cases against people that post defamatory comments on forums . we understand a key test is the comments include errors of fact and set out to create a negative opinion. 

Ummmm I'm a little unsure how DTM see this as top marks to Terry.
 
So Road and Track, just dealing with facts that you have written, this is how I read it, from exactly your post.
 
Customer came in and had a engine change done as they did not want to have there old engine reco'd.
They also had some other work done at the same time.
You fitted a used engine YOU supplied from another car. You checked the engine prior and offer a 3month warrently on the mechanicals of the engine.
You believed everything to be perfect with the conversion you did. Customer test drives and takes the car, they are happy.
Within 3 days time they have an issue with the idle.
You get it back can't find any faults, want to order a new throttlebody idle control valve which she would pay for and you would fit at no charge?
This takes several months so the customer starts a complain thread.......
Customer goes to toyota they advise her the ECU is faulty, repair the ECU and problem is solved.......
 
So what exactly do you beleive the customer should have done? Waited even longer for a new throttlebody idle control valve to be delivered? Send you the ECU when Toyota told them it had failed so you can send them another ECU with no warrenty?
If I gave my car to a garage to have major work done and am paying a lot of money I would be upset also if it takes several months to rectify the issue......I would be under the impression, i'm having my engine swapped I expect that my car is comming back perfect.

throttlebody idle control valve are pretty bullet proof also, they just usually need to be cleaned properly and they are good to go. Most people solve idle issues by cleaning the carbon out of the throttlebody idle control. They are easy to test also to see if they are working, i've had to do it.....

track_mr2 , I think you may have mis-interpreted my post.  Terry is a busy man, not only does he have a workshop full of customer cars to work on but he also has to deal with customer "issues".  In this case he took the time to give us more of the background to this story.
 
From what he has posted I'm seeing a car that had a previous idle problem, seemingly related to the air-con system.  After fitting a used engine/transmission package (customers decision) plus "other work", the customer initially OK'd the result.  A "few" days later (and I'm going to presuming that was a few days of driving) he then spent several hours trying to track a recurrence of the historical idle problem - at no extra charge to the customer.  He couldn't find the fault (possibly because as is often the case the car behaved itself in the workshop) but used his experience to propose a possible cause and solution, e.g. the idle control valve.  He has also (obviously) advised that in this case a new part from Toyota will be preferable to used - and he would probably have a few of these on the parts shelf.
 
Now both he and the customer are at the mercy of Toyota's supply line, and I know what that can be like.  No joy, he advises the customer and the customer decides to cancel the order.  Fair enough.  What I don't think was fair was at no point prior to Terry's reply were we told about the historical idle problem or the parts delay.
 
Also, Terry's explanation about wanting the original ECU sounds perfectly reasonable.  He wants to make sure that the replacement part he is sending is the right one.  And I've not yet heard if the replacement was going to be free of charge under warrant or not.

There was nothing wrong with air con its brand new. Terry thought it was an air compressor that was leaking gas and should be replaced and will be cost me $1500. At the time I cannot afford it .. I just want engine and gearbox running so I can drive it.
Terry said ok no worries he will regas it and O ring it….  But its still leaking gas and realised that the electrician must have missed this so he was called back to fix the wiring.  Then terry regassed again and $100 out of my pocket. He also put double O rings on it.  Problem solved and still working fine since.  So the compressors fine…..
“after various emails, customer agreed to have us order a new  throttlebody idle control valve which she would pay for and  we would fit at no charge.”
I was waiting for a month about this then I emailed you 3 times with no reply then you finally replied after I sent a concerned email and you said in few words that you haven’t heard from japan Toyota. So I suggested to forget it and cancel cos I knew its time wasting.

The reason why I started this topic is because youre not replying to my emails that I have sent many times to sort this problem … and I thought and felt like youre avoiding me and want nothing to do with this.

At the end it’s the ECU that’s the faulty of all this dramas. I have sent you an email two days ago to discuss in privately to sort this out. I haven’t heard back from you. So I will send you another email again today. So Please respond.

I'm going to lock this thread now. Everyone has had their say and I feel it has all been balanced and objective.
I stress to everyone that unless you rebuild absolutely everything, you should expect issues when fitting used parts.
The only solution to fault find issues like this is to change components one by one until the problem goes away. Cars are complex machines and even the experts have trouble finding the cause of faults.
Peace