I cleaned my TB now high revs @ idle
 

2007 5.3 Felxfuel
I cleaned my throttle body, now I have high RPM at idle around 2000.

I disconnected the battery for 10 mins. That did not do it I have only driven about 50 miles since which was ony 2 starts 25 miles each way.
Every thing I read and talk to tells me it will relearn on its own. How many miles do I need to drive before it goes back to normal idle.
I had only one vacuum connection that I unhooked during the cleaning and I re-checked it is connected so rule out vaccuum leak.

Thanks

did you take the TB off all the way to clean? also can up update what you did/used? I would think a loose vaccum line would make the idle go up and down bad but not just run high. is there anything that has the TB butterfly stuck open any?

I used CRC throttle body & air intake cleaner. I did not take the TB off I just cleaned as best I could with it attached. Sprayed the butterfly and throat? scrubbed with a tooth brush wiped clean. I had only 1 vaccuum line I disconected and it is re-connected.

I used very litle CRC because I did'nt want it to run down into the intake.
Thanks

a drive cycle will probably need to be long enough to get the vehicle fully warmed up and get all the emissions monitors okay if you have a code reader / scanner that monitors.... drive for about 40 miles should do it..

did you disconnect the TPS BEFORE you sprayed the solvent into the throttle bore?

RacerX I did not disconnect the TBS sensor prior to cleaning!

Do some more driving to see if it goes away hopefully but if it doesnt....

I guess you ddnt take off the idle speed actuator also. Hmm, maybe when you cleaned out the throttle body you pushed all the gunk into the ISC motor. Take that off and clean the butterfly plate in that also, same way, spray and soft toothbrush.

No codes?

No Codes, it seems fine while driving or in gear, just in park/Neutral is where I get idle @ 2000rpm Ill drive it some more and see if it goes away.
I have read where other had the same issue and just driving fixed it.

Thanks

I cleaned my throttle body on 07 suburban with 92k earlier today. Removed and cleaned, also clean MAF using correct cleaners on each. Butterfly was dirty but looks good now. I did this because of check engine light (forgot number) saying TB, fuel position sensor. Replaced w/ new fuel position sensor (at gas pedal) from dealer and light came back on next day. After cleaning, high and eratic idle. I have disconnected battery, driven about 50 miles with numerous stops. At times seams better then not. The only vacuum line is connected. Talked with mechanic, says he has seen this before and has self corrected with in a day. I hope does but if any else knows what to check, please let me know.

Well, look for an adjustment screw on the throttle plate on the opposite side of the TPS and when the car is warm put it in Neutral and chock the wheels. Get your tach speed, 2000 rpms you say. then put it in Drive, sure to chock the wheels or brace the car against a building or a tree and get your rpms. Does it drop to 600-650? Or is it in the 1200-1500 range? If it is higher than 800 then you re going to have to dial the throttle plate screw back counterclockwise 1/4 turn at a time to check for RPM speed on the dash.

Maybe when you were cleaning the throttle you might have pushed the adjustment screw unknowingly and bumped up the idle. I dont know...

If you get a good read in DRIVE but high in Neutral or Park...hmmm, do a backprobe test on the TPS sensor Key On Engine Off.

The ECM controls the idle speed whether in "Park" or in gear. Not like the old carb days.

I think revisiting the cleaning of the IAC or Idle Air Control as RacerX suggested in post #7... I think the IAC is either gunked up or is not working correctly...

On the throttle body, there is no scew visible. Since it is drive by wire, there is a electronic control of the butterfly that has metal clips keeping closed. That is where the wiring harness attaches. It looks sealed, and I did not open it. My wife drove the suburban all overtown yesterday and getting a little better. When it first starts, idles down, but when driving, let go of gas shift in to neutral, revs to 2500 rpm. When you come to a stop, then shift to nuetral, goes to about 1000 then drops to 600. When I first start it and idles down, now idles back down if I gas it for a moment and let go. Before, I would gas at low idle then it would go up then continue up. So again, seems to be getting a little better. Wondering if cleaning fluid got into the electical unit on side is the source.

Ok, well I m going to stick with stuck Idle Air Control Solenoid. How did you clean the throttle plate with no linkage to open the butterfly?

In the Ford MPFI systems the PCM set the Idle also, but they still put an adjustment screw for the throttle plate on the other side of the TPS sensor. It wasnt really for idle neither, more like to calibrate the butterfly during reassembly, especially on cars with cruise control.

Volvo had that drive by wire Throttle Assemblies in the early 2000s where the PCM would set the whole thing, problem was that the software could fail and then the car wouldnt start because the Throttle assembly could NOT interface with the PCM.

I removed the throttle body, and manually moved the butterfly, even though it it is controlled by the ecm, it is spring loaded to shut, When I removed it the second time to check it, it was in the closed position when off, it does not appear to hang up in any way. If I remove the air intake hose, with the key on the run position and engine off, would the butterfly activate acorrding to throttle position?

Looking at the chevy parts, I dont see a seperate air actuator valve for the 07 suburban. I believe it is part of the actual throttle body.

Just an update from my origional post, after driving i would say about 150 miles my idle has gone back to normal.

Thanks for all the input.

Thanks for the follow up:cool:

Good to know that something in this computer controlled truck works. ;)

Update also, mine has also returned to normal operation. It took a little longer and more miles than I would have though. Thanks.

New to the site! i have the same problem on 2 trucks at my work sight.I cant run these on the hiway because there only onsite trucks! Does anyone know of any other solution to this issue? I know it can be reset by the dealer with the Tech 2 but no access to one.I tryed a manual reset that i found off the internet,but dont work.

The new body style trucks that are drive by wire frequently will show a higher idle after cleaning the throttle body.

What happens is that as the grime and carbon builds up, the computer sees a different position for the throttle body and the throttle position sensor. By cleaning the throttle body, all of a sudden the computer thinks the sensor is supposed to be in one position, but it is actually closer to closed. Therefore, you get the high idle because the computer does not register the true position of the throttle body.

Many times, as seen in previous responses, the computer will relearn the throttle position. I have also seen an idle of 2,000 rpm because of the misalignment of the TPS. This is not safe to drive until it is relearned; imagine sitting with both feet on the brakes at every stop light.

Immediately after cleaning a throttle body or throttle position sensor on any drive by wire vehicle, you should hook up a scan tool and relearn the throttle position sensor location. This will give you proper idle speed, as well as improve gas mileage because the computer will set new idle air control parameters.

There are a number of Service Bulletins in GM info for this procedure.

My Tahoe has 150K on it and I clean my TB once a year since it gets so many miles on it. I had this problem the very first time I did it and a friend told me spray a small bit of WD40 on the pivot points inside the TB. I know, this sounds strange but it worked and I do it every time I clean mine. I think it has something to do with the cleaner and dirt getting in those pivot points as well as some swelling of the seal on each side that may cause the butterfly to move or react a bit slower until all of the cleaner evaporates. WD40 speeds this up since is a water displacing compound.

One other thing and I dont know if this is true on the Tahoe but I do it anyway. When I clean my TB I have my son or wife get in, turn the key to on but not to start and have them depress the gas pedal all the way to the floor and hold it while I do the spraying and cleaning. I have heard that you can confuse the ecu and sensors by moving them without the proper inputs and responses from those things??

Hope this helps.

Forget Relearn
 

Dont waste your time on a drive cycle. Ive had a low success rate w that. Simply disconnect negative battery cable and pump brake pedal 3x. Reconnect battery and your idle should jump to 1800, then settle down to 900-1000 rpm in park in a matter of seconds. THIS WORKS!

i have drove my 2008 impala over 200miles and my idle is still very high how do i do a relearn?

Welcome to the forum...
did you removed the TB to clean it? if so make sure its fully seated and all gaskets if any are in place and not pinched, you may need to remove it to verify... it may also be necessary to replace the TB gasket after cleaning as it compresses and may not have the same sealing effect after being removed...

You may want to read through this thread, it is for the trucks and tahoes but it may have some items that apply to your situation...https://chevroletforum.com/forum/tah...-gmt900-54328/

This worked for me too
 

Disconnecting the battery and pushing the brake pedal did the job! I had no success doing the relearn peocedure and idle was high even after driving 50 miles.

Thanks!

Ok,

I had to clean the TB. I was getting the stuttering and rough engine at the 25-40 mph zones and the stabilitrack warning a few times.

I took the TB off the vehicle, removed the electronics module. and very carefully with a brush and dry cleaning solvent cleaned the daylights out of it. It is pretty. I was careful to keep the solvent out of the stepper motor assembly and the two sensors on the unit.

I now have the high idle issue, that I did not have before.

I tried the tech service with the tech bulletin 1 update, that did not work. Going to drive it a bunch this evening to see what I can get out of it.

Edit #1 Taking the negative battery lead off the vehicle (not smart anyway!) and pumping the brakes 3 times did not resolve the high idle. I will state that I did this while the car was off and not running. This resulted in a 4K RPM on the next crank of the vehicle however.
Edit #2 I disconnected the battery completely and shorted the cables to each other. I then cycled the key on and off a few times. I left the battery off the system for about 4 hours while I was working on other things. No change. 1800 RPM.

Ok if disconnecting the battery dont work go to a dealer and connect a Tech2. There's an option to reset idle.

Thank you sir. I will be calling them this morning.

It is expected to throttle high after cleaning the throttle body, but may I ask you when you cleaned it did you open the valve to get in and clean it around the inner housing?
The reason I ask is that I was told to not open or move the butterfly as it can disrupt the throttle body position sensors.
That being said, the relearn procedure I was given is the following:
1.) Start and idle the engine in park for 3 minutes.
2.) With a scan tool, monitor the desired and actual rpm
3.) The ECM will start to relearn the new idle cells and Desired RPM should start to decrease.
4.) Ignition OFF for 60 seconds.
5.) Start and idle the engine in park for 3 minutes.
6.) After the 3 minute run time the engine should be idling normal.

Important: During the drive cycle the check engine light may come on with the idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.

--> If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.

7.) After the drive cycle, the engine should be idling normally.
--> If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.
8.) Onc the engine speed has returned to normal, clear DTCs.

Hope this helps and good luck.

This works just did it on mine fixed it in two minutes!!!! Thanks!!

I had a similar problem with my 2003 escalade. the battery died and when I installed the new battery it felt like the truck needed to relearn the shift pattern. I kept failing the odb test at the dmv because a monitoring system had not kicked back in since the new battery was installed and the rep said to drive it for 50-100 miles he had a 2013 escalade. that didn't work. it wasn't until I filled the gas tank up that the all the lights flashed on the dash the tach went to 0 and then back to 1500. the next run at dmv it passed.

02 chevy tahoe
 

Hello just curious to what peoples thoughts are. I seafoamed my tahoe through the brake booster hose and when I took it for a spin tge throttle got stuck open doing 65mph? Any idea as to what happened. I have the 5.3L v8

Not sure. Maybe you gummed up the throttle body with the seafoam? I've never used the stuff, don't know how it works. Take off the TB and clean it good maybe?

worked like a charm thanks

Did u run thos mile in one day or multiple days?

You are the man! Instant results. Thanks.

I have Traverse 2012 LT. yesterday I was cleaning the air filter, I saw throttle body is black. I unscrew 4 nuts and take it out.
Cleaned with tooth brush and petrol. For safe side i keep sensor side upward. After installing RPM was dancing up and down (500-1000).
I did all procedure as you guy did, Battery terminal removed, Drive it. but nothing happened. I observed that when i turned ON AC then RPM becomes normal and as compressor goes OFF same situation.
Today it has some improvements. Butwhen i reduce the speed and RPM goes to 1000 then its jump to 1500 and keep there until i apply the brake.
I don't have Scan tool :-( :-( how to fix it?? really fedup this situation.
:( :( :(

Any help???
Now my idle rpm is 500, when i drive and stop the car then idle RPM is 750........
For Testing, I Switched off the engine and then start it, again the RPM is 500............. Whats wrong?????