3.4L high idle

[Bootlegger750]

What could cause the high idle? IAC? TPS sensor? Thanks

 

[ToyTaco04]

Could be either of those. It could also be dirty MAF, vacuum leak, or throttle body stuck slightly open.

 

[jonnyT]

Does it sit high for every gear?

 

[Bootlegger750]

Could be either of those. It could also be dirty MAF, vacuum leak, or throttle body stuck slightly open.

Thanks, I clean the throttle body and IAC. Idles normal now.

 

[Bootlegger750]

"UPDATE"

Just some info from my stupidity if someone could benefit from it...lol. My 2002 Tacoma 3.4L starting idling high. I cleaned the IAC vavle. Helped for a few days I thought. [emoji2357] I checked for vaccum leaks, replaced all vacuum lines, new TPS, new IAC, new mass air flow sensor, and Throttle Body. No matter what still would idle around 1200-1350 rpms.

So, I scanned it a few times along the way. No codes and No CEL. On live data I noticed the engine temp would never get above 152. Well, the past week i scanned it every time i drove it. Code P0128 would randomly show up. I spent $15 on new thermostat. Like magic...idles normal now...lol. $15 worth of magic. Talk to a friend who is apparently much smarter and more observant than me. He told me..yep! Its idling high because it thinks it's still trying to warm up.

I guess what I'm saying is....I should have paid more attention and I'd saved some money....lol.

 

[stnsfnst]

I had the same problem on my 02 3.4L, just replacing the IAC did the trick for me.