Needing some Information

What year/rev was your original engine compared to the replacement?
 
Did you swap the ecu as well?

Was it a Australian delivered 1990 or a JDM (G-Limited), both non turbo but not sure if the ECU's are different.

got my car back from mechanics, after a hefty bill and several days waiting, Hopped in to take it for a test run, only to find the engine light on ...... not impressed. .... after a further inspection, and fault code diagnostic, I have found that the engine code being displayed is error 52 (knock sensor) which should be fine as it is from the original engine (that came out of the car) .... I asked the mechanics to bleed the cooling sytem, I believe they may have messed this up, bubble is the cooling sytem I believe could affect the knock sensor (is this right???).
 
Also the thermofans do not seem to be coming on, yet the temperature does not get above half (normal) and engine fan seems to be intermittant, and I have no idea why but the oil and battery indicator lights illuminate when I select reverse O_o ...
 
Any thoughts?
 

Yea the problem is sitting at idle for some time and the temp not rising at all .... that is a concern, it sat at mid for approx 15 min and didn't move, nor did either fan come on. As for the lights, have me stumped as they where working fine on the old engine and I did not notice them before I took it to the mechanic. I rang the mechanics back and they asked me to bring it back in the morning and the "head" mechanic will sort it out.... Hopefully this will be the end of the drama.
 
I have read up on the "bleeding" of the cooling system and found a couple of different way to do it, both very similar using both bleeder hoses and having the heater turned on at fulkl, I will be expressing this to the mechanic also.
 
Thanks for the replies, I will keep this updated.

Ok ...SO have the car back now, after the mechanic had busted the knock sensor ... then replaced it today, and now I am at my wits end, about ready to sell it to sims.... It has a list of problems, can be driven, but cannot accellerate much...
 
The oil level and battery light are constantly dimly lit and light fully when reverse is selected (wierd I know) also reverse lights are not illuminating, there is only one plug anywhere near the reverse switch so must have the right one there.
 
The engine bay fan light will illuminate (obviously stating fan not working when it should be) turn ignition off and back on ... fan works, light stays off ... O_o
 
Have not yet been game enough to run it hard enough to make temp rise much at all so unsure if thermofans are running properly.
 
under VERY mild accelleration it seems fine, but if I push the pedal down a little faster than it is accellerating at, the engine seems to die in the ass and sounds like it is "breaking down" ... yet if revved slowly will get there ... (so far have not pushed it past 4K rpm so unsure how hard it will rev.
 
I have a funny feeling I have missed something small ... somewhere ... as last engine worked fine, all dash light everything. and this engine is same year, N/A same as old, same everything... far as I can tell, the only differences I have been able to spot are a few connections (oil sender switch, knock sensor) and throttle body slightly different also. was there a series 1 and series 2 bought out in 1990, because as far as I know the series 2 was released in 1994. I should also point out that the engine came out of an import from Japan, 52Klms done (as per odometer).
 
When I was finishing up the process of installing the new engine, I got stuck at the starter not firing, and thermofans kicking in afterward with ignition fully off (later realised I had forgotten the main Earthstrap from gearbox) that had solved that problem, possible that trying to start it without the earthstrap, may have damaged some of the wiring in other areas?....
 
The key thing here is this is my daily driver for the moment, I work full time, and only have one day a week to play / fix any problems that arise making this a major pain. Any guys around brissy area that know their MR2's avaliable for a saturday soon?... can't pay much atm as I have just shelled out 2K for all the work I have done recently, but could at least put on some drinks, or possibly shoot some pics.
 
Going insane.

PM  sent.

im leaning towrads your afm for the hesitation specially now because you have a new afm that could be a dud, put the old one back on and see if the car drives any better