High Idle that doesn't come down after warmup-2005 Tundra Double Cab

Hi all, I am new to the forum and I have been looking thru posts for a while trying to find some insight into what is going on with my new truck. I have learned a lot from several posts and I thankful to you all for the information. I have owned several Toyota's, but I just recently purchased my first Tundra. My truck is a 2005 double cab 2WD with the 4.7L V8 and it has 170,000 miles on it. I know how important the timing belts are on these trucks, so the first thing I did was have it and the water pump replaced. Since then I have put new spark plugs and serpentine belt on it. I cleaned the throttle body and MAF sensor, but I am still having an issue that I can't figure out.
The truck runs great, but when you crank it up its idling at 1900-2000 RPM's and after 7-10 minutes of warmup it is still idling in the 1300-1500 range. It is not throwing any codes or anything and has a fresh oil change and normal gauge readings otherwise.
I had it parked in a gravel driveway the other day and after letting it warm up for nearly 10 minutes got in it to move it and it was still idling over 1300 and when I put the truck into drive and removed my foot from the brake it kind of lunged forward and spun gravel out behind it and took off on its own basically without even touching the gas pedal. I saw some other posts addressing high idling and it seemed that most people were saying the high idle is normal on these trucks, but this cannot be normal. Once I drive it for 15 or 20 minutes it seems to come down to a somewhat more normal range, but it is still idling over 900 RPM's and this just doesn't seem normal or healthy for the truck to operate like this.
Any ideas on the cause or help would be much appreciated. I am not a mechanic by any means and I am hoping its something simple because I have always heard great things about these trucks. I've had several Tacoma's and I have friends that have Tundra's and I've never seen any of them do anything like this.

 

Clean and Reseat the MAF connector. The IAT (Inlet Air Temperature) sensor is part of that and you might have a bad connection. Check with an OBD scanner to see if the temperature rises after start up.

 

Throttle body cleaning was the issue. Assuming you didn't damage the unit when cleaning, damage can be done if the throttle body is still on the truck and you manually move the butterfly. Throttle opening at idle is what the computer targets, not rpm. A cleaner butterfly will pass more air at the memorized idle throttle position, it takes the truck a long time to relearn idle at the ECU. Mine took forever after throttle clean, but did return to normal. There may be a forced relearn cycle, I don't know it, someone may chime in.

For reference my startup idle is 1100 +/- 100 in P, and drops to 900 in D. My warm idle is 650. After throttle body cleaning, those numbers were up about 200 to 250 rpm for a long time. I think warm idle in the FSM is 700 +/- 50 if I remember correctly.

 

Thanks for the info. I should have noted that this issue was happening before I cleaned the throttle body and MAF sensor. After cleaning those it did not improve the problem or make it any worse. I will try cleaning and reseating the MAF sensor and see if that helps out. I also tried disconnecting the battery and letting it reset and I have driven it for a while now since hoping the the truck would relearn a normal idle. I've done a lot of research trying to figure out what's going on, but I haven't found out exactly what's causing the issue with my truck so far. It seems to be different from the common issues I've seen people discussing on forums. Thanks for your help

 

After I removed/cleaned my throttle body I experienced high idle for a couple of days. It takes a bunch of drive cycles for the ECU to relearn.

 

Curious what your live data looks like at start up idle and warm idle. MAF g/sec, IAT, bank1 and bank 2 LT and ST fuel trims. I'm not smart enough to decipher the throttle position readings but a FSM smartypants may know something by looking at throttle position and pedal position readings as well.

 

This may be snake oil but I do recall it being successful from another thread here.

This is from TS forum….

 

vacuum leak?

 

When I purchased my 2006 AC V8 4x4 it also had high idle. Replaced the PCV valve and that solved the problem. Just wondering.

 

I'm not sure about the PCV valve, but maybe that's something I should check also. Thanks for the idea. I cleaned the MAF sensor again and have just kept driving it, and it has improved over time a good bit, but it still seems to take longer to warmup and not have the high idle than and any vehicle I have ever seen.