Delayed shifting after throttle body cleaning

[TruckME]

Hi guys,

I have cleaned my throttle body and the MAF sensor couple of weeks ago. After the cleaning my 2013 Yukon is not shifting gears as before. It is like it hesitates the shift itself. I haven't had any codes. Also the car idles normally. Any ideas what it could be?

Thanks

 

[OR VietVet]

Did you leave on the engine and open the flap repeatedly on the throttle body? Is a drive by wire set up and if not broken completely, I have heard it takes a while to relearn.

 

[Foggy]

After cleaning the TB you will want to do an idle RELEARN procedure.
You can do it with a diagnostic scanner or even without one.
Just search it on the web for GM DBW throttle relearn

 

[TruckME]

After cleaning the TB you will want to do an idle RELEARN procedure.
You can do it with a diagnostic scanner or even without one.
Just search it on the web for GM DBW throttle relearn

Yes I did the relearn... Leaving the engine to idle for 3 minutes then turn it off for 1 minute and turn it on for 3 minutes.after that I drove it on the highway for some time. Maybe I take it to a mechanic to do the relearn with a diagnostic scanner.
Thanks a lot

 

[OR VietVet]

Yes I did the relearn... Leaving the engine to idle for 3 minutes then turn it off for 1 minute and turn it on for 3 minutes.after that I drove it on the highway for some time. Maybe I take it to a mechanic to do the relearn with a diagnostic scanner.
Thanks a lot

Is there "anything" else you had done that you have not shared, so we know all that was done?

 

[TruckME]

Is there "anything" else you had done that you have not shared, so we know all that was done?

No just the TB and the MAF sensor. Cleaned both with the right cleaner.

 

[89Suburban]

Maybe I take it to a mechanic to do the relearn with a diagnostic scanner.

This should fix it, been there done that. Let us know how it goes.

 

[OR VietVet]

The reason I asked about whether you took the throttle body off, you did not answer that, is that if you have a drive by wire set up, take off the throttle body to allow for cleaning on the backside of the throttle plate without opening that plate. You would replace the throttle body seal at same time. Then the likelihood of the problems you are having now are close to nil. I hope this problem works out. Sorry if I sound snippy but I hate when a problem is asked about and all that happened before the problem is not shared.

 

[89Suburban]

The reason I asked about whether you took the throttle body off, you did not answer that, is that if you have a drive by wire set up, take off the throttle body to allow for cleaning on the backside of the throttle plate without opening that plate. You would replace the throttle body seal at same time. Then the likelihood of the problems you are having now are close to nil. I hope this problem works out. Sorry if I sound snippy but I hate when a problem is asked about and all that happened before the problem is not shared.

I thought all 07-14 were DBW?

 

[OR VietVet]

I thought all 07-14 were DBW?

Yea, I know they are DBW by my flumaxed context is wrong. Sometimes I state the obvious because I am just ****. To be clear, anyone cleaning a DBW throttle body, should be removing it for that process. Thanks, @89Suburban

 

[TruckME]

The reason I asked about whether you took the throttle body off, you did not answer that, is that if you have a drive by wire set up, take off the throttle body to allow for cleaning on the backside of the throttle plate without opening that plate. You would replace the throttle body seal at same time. Then the likelihood of the problems you are having now are close to nil. I hope this problem works out. Sorry if I sound snippy but I hate when a problem is asked about and all that happened before the problem is not shared.

Sorry missed that. No I didn't remove the TB. I know it is better but I understood it is not a must. Hope I didn't break it.... Although it is working. It is just the delay in shifting.

 

[B-train]

I have cleaned numerous DBW throttle bodies. You DON'T have to remove it. Just use your 2 hands. 1 to hold it WOT after you sprayed it down, and the 2nd to run the toothbrush. Rinse lightly, and wipe off with a clean rag. Pretty simple.

I've never done an official relearn - usually extended idle time with and without A/C, then normal driving. These motors are always LEARNING your driving habits, so just drive it like you normally do and it will adjust with a few drive cycles. The trans shifting is due to a slight change in input due to better airflow and readings.

 

[OR VietVet]

I have cleaned numerous DBW throttle bodies. You DON'T have to remove it. Just use your 2 hands. 1 to hold it WOT after you sprayed it down, and the 2nd to run the toothbrush. Rinse lightly, and wipe off with a clean rag. Pretty simple.

I've never done an official relearn - usually extended idle time with and without A/C, then normal driving. These motors are always LEARNING your driving habits, so just drive it like you normally do and it will adjust with a few drive cycles. The trans shifting is due to a slight change in input due to better airflow and readings.

Whatever works for you, I am all for it.

 

[Foggy]

After reading the latest comments, I would remove the TB and clean both sides
of it. Reinstall it with a NEW gasket/seal...
Then do your idle relearn procedure yourself.
You 'may' want to recheck or reclean your MAF sensor too.. Just to make sure.
That can cause funky behavior too

 

[Doubeleive]

After reading the latest comments, I would remove the TB and clean both sides
of it. Reinstall it with a NEW gasket/seal...
Then do your idle relearn procedure yourself.
You 'may' want to recheck or reclean your MAF sensor too.. Just to make sure.
That can cause funky behavior too

as Foggy said, but I really wouldn't worry about taking the TB off, you can and if you do try to wipe up in the intake body as well while you are there, the existing gasket should be fine, I would clean the TB AND maf again and then re-assemble everything and make extra sure everything is on properly tight and snug (harness, hoses, etc.. get a new air filter if not done already. Then maybe even go so far as to disconnect the battery ground for a minute and re attach.
when you start it up after that just let it sit and idle for a bit, don't rev it up or anything just let it run and then shut it off and start it up again and then take it around the block or whatever
if it doesn't start shifting right after that then my personal opinion is get some live data off the maf or maybe even consider replacing it as that is usually the culprit behind funky shifting. again just my opinion
I would also throw some injector cleaner in the gas tank for a couple or even 3-4 tank fulls if you don't already do that as a regular maintenance schedule, that will help smooth out the idle

 

[TruckME]

I have cleaned numerous DBW throttle bodies. You DON'T have to remove it. Just use your 2 hands. 1 to hold it WOT after you sprayed it down, and the 2nd to run the toothbrush. Rinse lightly, and wipe off with a clean rag. Pretty simple.

I've never done an official relearn - usually extended idle time with and without A/C, then normal driving. These motors are always LEARNING your driving habits, so just drive it like you normally do and it will adjust with a few drive cycles. The trans shifting is due to a slight change in input due to better airflow and readings.

Thanks very helpful

 

[TruckME]

as Foggy said, but I really wouldn't worry about taking the TB off, you can and if you do try to wipe up in the intake body as well while you are there, the existing gasket should be fine, I would clean the TB AND maf again and then re-assemble everything and make extra sure everything is on properly tight and snug (harness, hoses, etc.. get a new air filter if not done already. Then maybe even go so far as to disconnect the battery ground for a minute and re attach.
when you start it up after that just let it sit and idle for a bit, don't rev it up or anything just let it run and then shut it off and start it up again and then take it around the block or whatever
if it doesn't start shifting right after that then my personal opinion is get some live data off the maf or maybe even consider replacing it as that is usually the culprit behind funky shifting. again just my opinion
I would also throw some injector cleaner in the gas tank for a couple or even 3-4 tank fulls if you don't already do that as a regular maintenance schedule, that will help smooth out the idle

Thanks as always for your comments. I think I will try the trick with the battery. Hopefully it works and if not I will replace the MAF sensor. And yes I do use injecotor cleaner on regular basis. So I should be fine on that side

 

[TruckME]

as Foggy said, but I really wouldn't worry about taking the TB off, you can and if you do try to wipe up in the intake body as well while you are there, the existing gasket should be fine, I would clean the TB AND maf again and then re-assemble everything and make extra sure everything is on properly tight and snug (harness, hoses, etc.. get a new air filter if not done already. Then maybe even go so far as to disconnect the battery ground for a minute and re attach.
when you start it up after that just let it sit and idle for a bit, don't rev it up or anything just let it run and then shut it off and start it up again and then take it around the block or whatever
if it doesn't start shifting right after that then my personal opinion is get some live data off the maf or maybe even consider replacing it as that is usually the culprit behind funky shifting. again just my opinion
I would also throw some injector cleaner in the gas tank for a couple or even 3-4 tank fulls if you don't already do that as a regular maintenance schedule, that will help smooth out the idle

Disconnecting the battery and doing the TB relearn procedure did the trick!! The shifting is as smooth as it gets now.
Thanks again!

 

[Geotrash]

Awesome!! Thanks for following up also.

 

[Vint91]

My truck did the same thing after cleaning the MAF, it hesitated badly. I continue to unhook the battery and hooking it back up, waiting for it to relearn in the end after driving it for a few hundred miles. It finally read learnt the new system on its own.