Okay after my last track event I've developed some more issues that are driving me nuts. The first is a whistle that comes on under boost. It sounds like its comming from the intercooler but I can't find any holes. Car still makes full boost without issue. I tried my own pressure test on it and it didn't seem to have any holes. Could it be a small hole in the exhaust instead? Anyone had a small hole in the exhaust before, does it make a whistle sound when loaded?
 
The other bigger issue is the car is running very rich at start up and idle. I have done a diagnostic check and there are no error codes. Being a gen 3 I'm led to believe there is no cold start injector. The car will shut off at idle sometimes unless I feather the throttle. If I drive it off boost it seems to be able to idle when I lift off the accelerator but if I floor it and let it boost through the gears, when I lift and stop the car wont idle, it will just stall unless I feather the throttle. It seems like its running rich at partcial throttle also and even under boost as I can hear extra fuel backfiring in the exhaust but the car drives with the same power it always had so its not like its dropping power under acceleration, just a bit too miuch fuel. What i've checked so far is the ecu for error codes which came back all clear. The spark plugs aren't going black if I turn the car off after driving. They are all comming out brown, so I don't think an injector is stuck open as I would expect that cylinders spark plug to be black. The ignition is all brand new, no misfires at full boost. All I can think is maybe the O2 sensor is bad but with no fault code on the ecu? Also the fact it idle sometimes but not after full boost is odd. Anyone got any ideas?

Is it running on the standard ecu? have you tried resetting the ecu and seeing how it goes after that?

It has a mines chipped ECU so basically standard at start etc....
I have reset the ECU just recently as the battery died and I had to fit a new one. As the car isn't street registered I haven't driven it more then maybe 1km as it has that idle issue.

How about the vacuum line to the map sensor? I'd be checking all the small vac lines running through the engine bay and replacing with new if they are old and cracking.
 
Tried unplugging the O2 sensor? without it connected it will give a fault code but the ecu will use default values. This might indicate whether yours is stuffed?

I've checked the vacuum lines and they all seem good. If there is a vacuum leak ater the MAP sensor however it should technically run lean not rich as it will drawn in air after the sensor. That's why I'm leaning towards the O2 sensor as it looks most liekly to occur during closed loop but Toyota say if there is a problem with the O2 sensor it ALWAYS will be picked up by the ecu and register a fault code. It's very odd becuase it does start idling properly but if I let it boost up immediately after it wont idle. Apparently the O2 sesor doesn't kick in till it is warm which doesn't explain the over fueling during start up either.

Hmmm, your timing set correctly at 10 degrees? Mine was out on my gen3 which caused a weird warm idle running rich once.
Have you tried a stock standard gen 3 ecu to confirm the Mines hasn't developed an internal hardware fault of some kind? 

Sounds vac related to me. Check for small splits on the ends. It's been a common problem for me over the years.

Well the idle air controller does make a lot of noise. Is that how they all are? You basically hear it hissing away at idle but if you squeeze (block) thre vacuum line going to it from the manifold it goes quiet, mkaes the car stumble a bit?
I have fitted a new rubber hose to this, so definately no cracks on that one. I'll go over all the lines again but I can't find any vacuum leaks. It definately runs rich though, you can smeel the fuel through the exhaust plus when driving you can hear it pop as the unburnt fuel blows in the exhaust.
 

Just as an update I reckon I know what the issue is. I reckon I have an exhaust leak from the dump pipe somewhere. This would explain the whistle under boost and also at idle it will get extra oxegon into the exhaust system causing the idle to run rich from the o2 sensor.......only problem is I haven't been able to spot where the leak is yet.

is it an ebay dum pipe, must have cracked they are known for doing sousually around the area near the o2 sensor (genral area so look around there where the collector meets the pipe)