Early EDM non-cat 4A-GE 16v Bluetop Fails emissions (high co)

[Rascal21]

Indeed 10 points for this guess to Totta!
As I said I`m here to learn, I know only a little about 4A-GE`s and forums are usually the way to go!
The Cold Start harness is part of the Body harness on AE86, which a TA40, KE70, TA60 etc usually does not have (unless its a 2T-GE/3T-GE/3T-E/4K-E/3K-E/7K-E or something)
Kind of odd that people have not had this problem before though, but I guess they get their cars (KE70/TA60 or whatever) approved and tested pre-swap, then go ahead and swap the engine and drive around and slam it for 2 years then sell car+parts and never have to cope with emissions test.
But I`m stubborn and think doing the swap and having it semi-legal and sticking with the car is better and more fun

ALSO 10 points for the man who linking to the Ross guide, it shows a lot of interesting information about what makes the 4A-GE ECU`s "tick"

And to be fair to everyone who chalked it up to internal engine problem, normally I would have also chalked it at "borked engine".
No secret the engine IS old and the emissions issue could very well have been that as well, on top of that most of us have seen or heard 4A-GE`s not pass emissions because of leaky piston rings, valve seals, damaged HG etc which for example is a common problem on 4A-GE`s that have been through a overheat or two.
That said, the symptoms are usually a combination of high CO emissions, serious compression problems and they don`t have lambda values off the chart.

The TPS is a long story that I felt was not necessary to tell here, and as usual we can surmise that leaving out info about what you`ve tried to solve the problem, in technical threads like these, IS a bad idea, about to correct that however..
I DID adjust TPS to the correct values a year ago (a mere 1 or 2mm deviance from where the TPS was sitting), but THEN a few days ago found that it resulted in engine revs racing when you try and hold the throttle at any rpm`s between 2000-2600 in idle condition, but in hindsight that probably would have been because of the missing potmeter, the injectors that I swapped in, and the pig rich a/f mixture.
The TPS and Throttle Body had scrape marks across them which both I and the inspection mechanic assumed to be a position worth trying out barring anything else (This was just before I sat down and finally figured out the VAF>A/F potmeter wire), and the TPS was misplaced according to those scrape marks, so we both figured the TPS could be adjusted to that position to see if that helped with the 2000-2500rpm racing AND emissions both at the same time, it did help with the racing but did ZERO (one way or the other) for the emissions when potmeter was not connected to ECU.
Now that the potmeter IS working, it`s back to getting things back to exactly how they were before I swapped it out/fiddled with it etc

As usual, will update with results.
As far as emissions go (engine is probably due for a little freshening up anyway), if I can get it below 4,5% CO and 1.0 Lambda it`s good enough to do what I need to do with the car for this summer (transport some parts and shit)