Hey I have a 2002 SR5 4WD with the 3.4 in it, a couple months ago I was running in drive at idle around 7-800 RPM. now it has dropped to 550-600RPM, anyone know what can cause this? I checked my air filter and it seemed clean enough (its a K&N).

 

alright, cleaned my airfilter just to be sure and it didnt fix the problem, how can i adjust the idle, or should i be cleaning something to try to fix this?

 

The likely culprit is a dirty throttle body (see cleaning the throttle body...) :
http://www.4x4wire.com/toyota/mainte...tenancep5.html

You might also check your MAF since many experience problems with those K&N filters. I most don't recommend them on this board since it does tend to foul the MAF over time (I'd sell it on eBay and get an Amsoil instead).

 

hey, thanks for the link, i will be doing all of that tomorrow morning, you are actually the first person ive ever heard that didnt like k&n, is an amsoil similarly priced?

 

My 99 will do this, and not long after will light the CEL with P0171.

Clean the MAF. Be sure to get down inside where the actual hotwires are and not just the IAT amber bulby thingy.

 

Check this out regarding K&N:
http://www.gadgetonline.com/AirInduc...0air%20filter:

 

Did you found the problem? I have the same issue on my 99 3.4. Sometimes idling at 550-600rpm. Thanks!

 

low idle is usually and air issue. Have you tried removing the air filter ( to eliminate potentially clogged filter element) or spraying carb cleaner along all the pipes (to check for leaks)?