Idle problem when coming off boost

[JZX100MARKII]

Hi i Have 1jz-gte when i boost and then go to slow down at lights the revs drop right down to almost stalling or it does stall. any ideas what this could be???

[m989]

Converted manual? Reason I ask is that this problem has been reported over on the aussie JZX site where the car is still running the auto ECU with a manual gearbox. I have never had a problem with my car stalling since the manual conversion 6 months ago (still running auto ECU).

[davealdworth]

Have a look around the vacuum lines there may be some splits or cracks somewhere that are causing the idle control valve to get false readings. Have that on my 110 for a few days, stalling when coming to a stop thanks to a perished hose.

[ch4sernz]

Atmospheric bov?

[JZX100MARKII]

yes it is atmospheric. and will check my vacum lines

[davealdworth]

The atmospheric BOV's don't work well with the 1jzgte vvti. Because its not circulating through the j pipe system it either over fuels or under fuels when coming to a stop or even slow driving causing it to stall

[Tofu]

I had these problems too...
auto ecu with atmo bov on r154 swapped 1jz vvti and it got worse when I removed the jpipe.

I had to raise the idle on mine to compensate for the rpm drop when you come back to idle. Otherwise if you get a tune it can fix this issue - using a safc or replacement ecu.

[JZX100MARKII]

thanks guys really helped will be looking to get tuned soon to resolve the issue

[ch4sernz]

What ecu are you going to run?

[JZX100MARKII]

Have only just thought about it. Any one got any recommendations?? Would be much appreciated

Cheers