2VZ Electronic Idle Adjustment - Toyota Nation Forum : Toyota Car and Truck Forums

JetspeedCamry · 07-10-2005, 09:37 PM

As many of us know, the 2VZFE uses the ECU to control the idle speed. Unlike the 3S series, where there is an adjustment screw present of the TB.
Since my car is going to be manual, I am wanting to devise a way to control the base idle speed, electronically. Perhaps a trim-pot or pot across the terminals of 2 of the ECU pins, but which ones? And how to trick it? How about the AC Idle Up VSV? Does anyone have any ideas?
I know on USDM manual 2VZ's they have what is called a "Dash Pot", which is something to do with idle, but I have no idea what it is.

Any help would be appreciated.
Regards.

Luckynumber5 · 07-10-2005, 11:51 PM

A Dash pot has to do with emissions, it stops the throttle body from slamming closed when you let off the gas pedal, my 4afe celica has one and for the longest time i didnt know what it did. I cant tell any difference with it and other cars, I think there actualyl is a screw you can turn to keep the tb open a little more, but only to a degree, look all over your tb and the ICV for a little screw, its worth a shot but i cant gurantee it will do what you need

white90dx · 07-11-2005, 02:36 AM

The 3s-fe has electronic idle control and the motor will die often if it is not working correctly...

What do you want to do with your idle? Up or down? You should just be able to fool your ECU into thinking you are in Drive and it should idle just right for the manual tranny.

-Charlie

JetspeedCamry · 07-11-2005, 02:53 AM

Yeah I just wanted some sort of adjustment, most likely to go up in idle. I think it should be ok, as the ECU is going to think the tranny is in P or N, so we'll se how we go.
Any ideas on how to "fool" the ECU?

chronoti · 07-11-2005, 07:31 AM

search for about my 1st few post on tn for how to readjust the TPS. advance it a little you can trick the ecu to thinking the tb is more open than what it really is. it's an old 22r trick.