3VZ throttle surge - Toyota Nation Forum : Toyota Car and Truck Forums

asushi · 02-06-2010, 11:16 PM

93 camry V6 - 3VZ motor

engine is warm, I'll flip the TB open for a split second: revs up, drops down below idle, surges up above idle again. Sounds like a sticky IAC to me. Are these problematic in this car? Is there an easy fix?

hill8570 · 02-06-2010, 11:43 PM

Pretty much all of these rigs (including the 3VZ) that vent the PCV valve into the TB have problems with the TB, throttle plate, and IAC getting gunked up after a while. Cleaning the TB, the throttle plate (especially the edge) and the IAC port is usually worth trying.

rusty9 · 02-07-2010, 10:12 AM

yeah its an easy fix. remove it and clean it out with throttle body cleaner. if yours is really high mileage expect a lot of black gunk!

***BMR*** · 02-08-2010, 11:45 PM

Here's a DIY thread with pix showing how to remove and clean the IAC valve on the 3VZ-FE.

Link to thread

I did this a while back and it fixed a surging idle. I'd advise skipping steps 7 thru 9, though. Mine was pristine clean inside with adequate lube. The way it's sealed, I don't see how it could need to be opened up & cleaned/re-lubed.

In the picture in step 10, pay special attention to cleaning the valve area in the center. Get in there with a Q-tip or something to get all the gunk out. That's where it really matters. Mine was caked up really bad there.