Good day all. I'm having some idle issues with my wifes 05 GX and I'm hoping someone can help me out. The truck has about 177k miles on it and has been very well maintained by us as well as the previous owner. The idle issues are when the car is warm, at a stoplight in drive the idle dips to about 500rpm even with the AC is on. It hangs out down there for a about 10 or so seconds then jumps up to about 700 (where it should be at warm idle with the AC on) and kind of jumps around a little more while I'm sitting there. I have checked for air intake leaks, put in a new air filter, and cleaned the throttle body. Everything is secure and I couldn't locate any leaks. Truck otherwise runs fantastic it just seems to be idling very low. My next guess is maybe spark plugs? Any advice would be much appreciated.

 

Doing Plugs is a no-brainer, judging by the fact that you have replaced the other items listed. Now have you also replaced, or looked at the PCV valve? That's where I'd start as well. spark plugs are cheap and simple to replace.

 

Agree.

How is oil consumption? A stuck open PCV valve is both a vacuum leak and a way to lose oil.

Chip H.

 

Thanks all. I had already ordered Denso plugs and those came in yesterday. Gonna change the plugs tomorrow. Where is the PVC valve on this engine? How difficult of a change?

 

I just stole this pic from Google but you get the idea of its location and difficulty of replacement.