[Guest]

My 308 was staying in high idl

My 308 was staying in high idle today so I assumed it must be the AAV. So I let the car warm up and it stay at around 2500rpm. I removed it and it was about 70% closed with only a little light that could be seen through it. I noticed that there is some little solenoid behind it that the AAV seems to get its power from. I checked the vacuum line that goes to it and noticed that when it was removed the rpms would stay high and when I put it back on the Plenum chamber it would drop down. Could this cause something to be off with the AAV? Thanks.

 

[Guest]

When warm, if the AAV is open

When warm, if the AAV is open even a little, that means it's no longer good. Some of these parts are 20 or more yrs old now and sometimes they give up.

Regards, JRV

 

[Guest]

Got it. It must be shot. Tha

Got it. It must be shot. Thanks for the info. I will track one down..

 

[Guest]

Would agree that after all thi

Would agree that after all this time it probably is worth replacing...but I know a couple folks got "lucky" cleaning with aerosol carb cleaner and a little WD40 and got them working again. Worth a try (free).
This article says the same thing, you can sometimes clean them...
http://www.auto-solve.com/mech_inj.htm#MFI12

I have always replaced them, as I didn't know you could clean them...

 

[Guest]

Cleaning thoughts...

As the

Cleaning thoughts...

As these cars get older, oil residue from blowby (which will pass through the AAV) tends to gum up the internals, hence not allowing the shutter to close completely. As Dave suggests, cleaning often works, or is at least worth a try before replacement. Along that same venue, it's a very good idea to clean the throttle bore area, particularly around the area where the plate sits. Oil sludge build up in this area can also contribute to a fast idle.

Regards,
David