Throttle Body Relearn

[Neuner]

Replaced the Throttle Body on our 2014 Suburban LT and went through the relearn procedures.

Ran it for 3 minutes but it's at 3040 rpm for 15 seconds, drops to 2640 for 5 seconds and then back up to 3040. It does this over and over again.

I shut it off and waited 60 seconds as instructed. Started and for the next 3 minutes it did the same high rpm.

I did this for 4 rounds and nothing has changed and I don't see any relearn instructions that state it should be doing this.

Bad part or am I doing something wrong?

 

[Geotrash]

Replaced the Throttle Body on our 2014 Suburban LT and went through the relearn procedures.

Ran it for 3 minutes but it's at 3040 rpm for 15 seconds, drops to 2640 for 5 seconds and then back up to 3040. It does this over and over again.

I shut it off and waited 60 seconds as instructed. Started and for the next 3 minutes it did the same high rpm.

I did this for 4 rounds and nothing has changed and I don't see any relearn instructions that state it should be doing this.

Bad part or am I doing something wrong?

Happens sometimes. Scan for codes and if you get throttle body related codes, clear them out. If the idle speed is still high, drive it at speeds above 45 mph and make several accelerations and decelerations. Then restart it and let it idle for 3 more minutes. Hopefully that should do it.

 

[Neuner]

Cleared codes, started and idled at about 1500k.

Drove it for about 30 minutes, most of it above 45 mph. I accelerated and decelerated quite a few times. It also did this on its own. As codes were detected, I cleared them.

With foot off of gas, it would pull along at 45-50 mph. Idle at stop light would be between 750-1000 rpm.

Pulled in driveway, put in park and the idle revved up to 3k again.

Ran codes again and says P0300 Random / Multiple Cylinder Misfire Detected and P0507 Idle Control System RPM Higher than expected.

What in the world is going on?

 

[Doubeleive]

Cleared codes, started and idled at about 1500k.

Drove it for about 30 minutes, most of it above 45 mph. I accelerated and decelerated quite a few times. It also did this on its own. As codes were detected, I cleared them.

With foot off of gas, it would pull along at 45-50 mph. Idle at stop light would be between 750-1000 rpm.

Pulled in driveway, put in park and the idle revved up to 3k again.

Ran codes again and says P0300 Random / Multiple Cylinder Misfire Detected and P0507 Idle Control System RPM Higher than expected.

What in the world is going on?

I would clear the codes, disconnect the battery, while the battery is disconnected take the maf off and clean it, put it back on.
re-connect battery and drive it.
double check your work make sure you didn't unplug anything else and that the intake is on correctly, leaking un-metered air would be a problem
I have cleaned and changed and I even changed mine to a ls3 throttle body and it plug-n-played, never have had any issue

 

[Neuner]

Did all that. Left battery disconnected for a couple of hours.

Started it up, revved to about 2k and then settled to about 8-900 and stayed. Let run for 3 minutes.

Turned off an let sit for 1 minute. When I started it again, it produced the same 2 codes and went back to idling at 3k.

I have no idea what could be wrong except for a bad new unit?

 

[George B]

Why did you replace it and do you have the old one?

 

[Doubeleive]

Did all that. Left battery disconnected for a couple of hours.

Started it up, revved to about 2k and then settled to about 8-900 and stayed. Let run for 3 minutes.

Turned off an let sit for 1 minute. When I started it again, it produced the same 2 codes and went back to idling at 3k.

I have no idea what could be wrong except for a bad new unit?

every once in a while we hear about some one having to have it learned with a tech2, but myself and many others have never had to do it, shoot even when I had my 00 with drive by cable and I had to replace the iac it corrected it's self in about 30 seconds.
did you buy a oem one or a aftermarket?

 

[Neuner]

Why did you replace it and do you have the old one?

The reason is with my other thread; https://www.tahoeyukonforum.com/threads/tps-issue.139288/

every once in a while we hear about some one having to have it learned with a tech2, but myself and many others have never had to do it, shoot even when I had my 00 with drive by cable and I had to replace the iac it corrected it's self in about 30 seconds.
did you buy a oem one or a aftermarket?

GM Genuine.

Going to put the old one back in and get this one exchanged. Thankfully it's quick and easy to replace.

 

[Foggy]

OEM Throttle body is a Hitachi.. So if you bought a reman or another brand that is
probably the case...
Also: why did you replace it to begin with????

 

[Neuner]

OEM Throttle body is a Hitachi.. So if you bought a reman or another brand that is
probably the case...
Also: why did you replace it to begin with????

Here's photos of the OEM that was on my vehicle and a pic of the new ACDelco. Where does it say Hitachi is OEM?





Both have the GM stamp, same model # and QR Code.

 

[Geotrash]

OEM Throttle body is a Hitachi.. So if you bought a reman or another brand that is
probably the case...
Also: why did you replace it to begin with????

It was a link in the chain of some throttle position errors he was trying to solve.

 

[Neuner]

Put the old one on, and all is fine. No codes. Before and after Relearn procedure, idle is ~740.

Going to exchange.

 

[Doubeleive]

Why did you replace it and do you have the old one?

Here's photos of the OEM that was on my vehicle and a pic of the new ACDelco. Where does it say Hitachi is OEM?

View attachment 391861

View attachment 391860

Both have the GM stamp, same model # and QR Code.

Hitachi makes them for GM, may or may not be visibly stamped Hitachi
usually you can pick up a Hitachi boxed one for a few bucks less than oem and still have the same product

 

[Neuner]

Hitachi makes them for GM, may or may not be visibly stamped Hitachi
usually you can pick up a Hitachi boxed one for a few bucks less than oem and still have the same product

Oh yeah, saw that. It's about $150 in difference. Figured with the weird issues I'm having, didn't want to take the chance of introducing something else with what might not be OEM. I learned the hard way when I swapped in an OBDII fuel injected engine into my old Jeep and tried to save some dough by not going the OEM route.

If someone posted where Hitachi is officially the OEM for this model + year, then I'd much rather give it a try.

 

[Doubeleive]

Oh yeah, saw that. It's about $150 in difference. Figured with the weird issues I'm having, didn't want to take the chance of introducing something else with what might not be OEM. I learned the hard way when I swapped in an OBDII fuel injected engine into my old Jeep and tried to save some dough by not going the OEM route.

If someone posted where Hitachi is officially the OEM for this model + year, then I'd much rather give it a try.

Usually not that much of a price difference, normally from legit sources you might see $20-30 less for a Hitachi. I don't have "proof" showing they are made by Hitachi but many other forums say the same and there are various other gm model vehicle throttle bodys that are stamped Hitachi corvettes Camero trailblazer etc, depends on the year.

 

[Geotrash]

FWIW, I installed a Dorman in my 2007 30K miles ago and it’s been fine.

 

[89Suburban]

I had that issue when I replaced mine. I had to take it to the shop to get a forced re-learn. $80 bucks at Pep Boys before they went to sh*t.

 

[03catburban]

I replaced many at my old shop and only way that would relearn idle is hook scan tool up and take the 10 seconds to click idle reset and done

 

[George B]

Maybe someone with a TECH2 lives close to you...

Tech 2 Owners Map

There are quite a few members that have a Tech 2 and there are always people who wish they had one to use so I thought I would post this thread to try and help each other out. If you own a Tech 2 and would be willing to help out another forum member that might be local to you then post up your...

www.tahoeyukonforum.com

 

[houstontaylor]

I replaced the throttle body on my 330,000 mile 2003 Tahoe with a Hitachi aftermarket one and it went bad after only a few months. The original problem was a rough idle but when the Hitachi went bad it would hardly even drive. I paid the extra money to get an OEM throttle body and so far so good.