increasing engine idle speed ?

[mazilla]

Originally Posted by ron3

I asked the toyota service advisor today and was told it could not be adjusted. He said to just give it more gas. He also said that the reason the motors stalled and shuttered badly at take off was because they had very little low end torque.

The service adviser is completely wrong.


You will need to remove the TB from the vehicle and then locate the small blob of epoxy covering the adjustment screw. Using a torch and pick burn the epoxy and pick enough of it away to free up the screw. It sould take all of 45min-1 hour to get the TB off, epoxy cleared and the TB back on to begin adjustment.


Mark the original location with a paint pen(or whatever you have handy), give the screw 1 complete turn clockwise and then reconnect the battery, turn the key to ignition, pump the gas pedal a couple of times(to manipulate the butterfly into it's new position) then start it up. Give it a few minutes if you feel the idle is correct just to be sure it stays where you want it when warm/hot...obviously if the idle is sky high you'll want to go back 50% towards the original location, so on and so forth.


It's best if you start the process with a warm engine, you'll want to be as close to normal operating temp as you can. I wait until I'm at 185 degrees or so...which means I have to be careful of hot coolant and hot parts, but it's not an issue really. The biggest pain is the TB coolant lines, they will spew hot coolant when you drop them below a certain level/ It would be best to block them off until you are certain the idle is where you want it, then reconnect, top off coolant and go.




No amount of money(short of standalone and wired throttle) will change that shit idle, you'll have to take matters into your own hands.

The stock ECU doesn't like an idle that stays above 750ish very long, in order to get that 1K idle I have to deal with the check engine light. Also, the damned ECU will do it's best to compensate for the idle after a while, it may eventually get you back down to 750ish, I'm not sure exactly what it does to get you there but it may end up in the occasional coasting stall.


Even after going back to the 1nz TB for some time this week I noticed the ECU driving me back down to 750ish rpm, which resulted in a stall a couple of times as I would shift from 3rd under power to neutral and coasting to a stop. The rpm's drop down to 500, freeze, try to jump up but end up falling all the way off and stalling out.