S2000 Idle Problems - (IACV) Idle Air Control Valve FIX 

@@VirtualGuth Thanks for taking the time for the comment. Glad it’s helping S2000 owners. Please hit the subscribe button

Glad it worked out!

Thanks so much 🙏.

Same with my civic. I just used an impact driver to break them loose then a regular Phillips #2 will take them out

If you remove the battery don’t you need to reprogram the stereo? That’s what I have heard before.

@sixstrz8310 yes. You’ll need the radio code

The idle valve is controlled by the ecu, it sounds like your talking about a thermostat.

Nope. Take a look at any Helm service manual which describes the IACV operation including the thermowax device.

@@pault6533 I’ll take a look in the Honda Service manual tomorrow and confirm 👍🏻

Cool. You’ll be surprised that this is a “secret feature” which assures a good cold start until all the sensors catch up or if the computer is in limp mode. It works on the principle that wax changes volume when it changes from a liquid to solid and back, which can drive a piston and change the position of a valve. Knowing this can help diagnose other IACV system issues.

Update: I reviewed the service manual myself (00-03) to find information about the IACV features of the s2000 in particular. Apparently, the thermowax device is not present on the S2000, as it had been on many other Honda/Acuras I previously had. Perhaps the coolant path is to make sure there is not "icing" under the right dewpoint conditions which could make the throttle valve stick open. I don't know about anyone else, but on a cold start the engine races up and down. Has been this way since day 1. Maybe Honda SHOULD have put in the thermowax actuator!

Thanks for watching. I visited Spain a few times as a teenager. I love that place.

Yes. These rotary style have more problems than the early ones from what we see.

Check the voltage on the TPS

Yes. I always recommend a IACV unless It’s a race car. Street cars with AC and PS need these.

even in neutral if I am just sitting it will randomly shake

If you remove the motor. It should be perfectly free. No dragging or resistance.

@@LHTPerformance mucho thanks. you're working awfully late on a weekend haha

90% of the time we can clean and fix them.

I don’t think you can buy them. You may try some small washers

Plenty of oil and build it over the crank so not to fold the seal. It’s pretty straight forward.

Thank you! Edit: John thank you for the advice. I installed my rear main seal, and clutch (Both OEM) yesterday and everything turned out great. Besides a few rust belt hiccups.

Around 800-900rpm

Use a voltage meter and see if the TPS has accurate read out and no breaks.

They don’t have the issue. Hence why almost every manufacturer changed to them.

@@LHTPerformance I appreciate the response. I wasn't clear. I was looking for a fix to a DBW AP2 with a rough/low idle.

@@lorenwatts2920 I would check the basics. Plugs, Valve adjustment, injectors etc for a stumble

@@LHTPerformance Thank you

Just wanted to post an update about my 2006 DBW S2000's rough idle. The fix was a Valve adjustment. The #3 cylinder's exhaust valve clearance was less than .003 and spec is .010 - 011. At 66.000 miles this is the car's first valve adjustment. A few months prior to the valve adjustment I had changed the plugs and coils. I really appreciate your DIY help and enjoy the S2000 videos.