Only with bolt ons

[GustavoPR]

Originally Posted by Neinris

If you don't do the reflash, would cold starts have high rev similar to changing the throttle body with one from the 1ZZ?

A reflash won't change your cold-start idle speed; you need to adjust the Allen-head screw on the throttle body—the one with the locking compound on it—to fix that. I adjusted mine with the A/C on so that when the compressor kicks in, the RPMs don't drop too low and cause the engine to stall or start shaking. Before the adjustment, it would rev to 3,000 RPM or higher on a cold start; after adjusting it, it goes up to between 1,900 and 2,100 RPM, depending on the ambient temperature. I’ve tested this with both the 1ZZ and 2ZR throttle bodies.