[4G93T] TD05 idle issues

[aapje]

I have a 4G93T engine in my Mitsubishi Colt car. Now I've changed the stock turbo for a E3 TD05 with custom oil-line, evo injectors, evo AFM. (Already had a EVO TB) I also run a evo 2 ecu. I also did a cam belt job in the meantime.

Now above 1400 rpm or so the car runs smooth, it also flies through the revs on the road but when running stationary and below 1400rpm it runs rather rough. It's a bit shaky, it didn't use to run like that.

The problem in cases like this is that there are multiple variables that changed. I was thinking maybe it's down to a vacuum leak. I didn't find any, but I will investigate further tonight. What else could it be?

Should a 4G93T with evo bolt ons run silky smooth at once or does the lack of displacement interrupt something? I suppose it shouldn't matter since the MAF sensor should just read less air coming in, so it would be the same as running a stock EVO a few thousand meters above sea level right?

Any ideas would be greatly appreciated.

 

[khubner1]

check the fiav + idle stepper. im running similar mods td05 magna tb still on stock injectors afm and ecu tho and have no probs.

 

[aapje]

check the fiav + idle stepper. im running similar mods td05 magna tb still on stock injectors afm and ecu tho and have no probs.

I didn't change the stepper motor, so it would be a coincident if it was faulty. Fiav is that the thing on the bottom of the throttle body that has a water supply running to it to make the engine increase RPM when it's still cold?

I was already running this throttle body on the TD04 setup in the past without problems. When I come to think about it, at this very moment the car has no exhaust beyond the O2 housing. (exhaust is to be fitted next month). Maybe the 02 sensor is disrupted because it's almost hanging in the open air causing it be erratic when it's on low RPM. On higher RPM it has the ability to read the exhaust gasses more reliable since there are more travelling by.

Thanks for your help so far

 

[4piknup]

surely if you run evo injectors and evo ecu on a 1.8, it will be rich down the bottom end. it maybe rich enough that it wont go into closed loop too.
just chuck the gsr injectors in for a test to see if it improves it, if so then it prob too rich.

 

[caged]

surely if you run evo injectors and evo ecu on a 1.8, it will be rich down the bottom end. it maybe rich enough that it wont go into closed loop too.
just chuck the gsr injectors in for a test to see if it improves it, if so then it prob too rich.

It works very well, the afm just see's less air and adjusts to suit.