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post #16 of (permalink) Old 04-07-2019
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12 lt, if you do decide to purchase a new tb, may also check Ebay Motors and Amazon for pricing.
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post #17 of (permalink) Old 04-07-2019 Thread Starter
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Originally Posted by jtrosky View Post
@12 lt - I happen to have my stock 2012 throttle body sitting here (I replaced it with a ported throttle body). While I'm not sure that I want to sell it, I would be willing to let you try it so see if it solves your problem before you go ordering a new one that you can't return if it's not the problem.

Obviously, there would be shipping fees each way that you'd have to pay, but I just wanted to extend the offer if interested... PM me if interested...
I appreciate the offer, I may take you up on that. Waiting on the air filter to dry right now. The throttle body was not too terribly dirty, should not have been causing any issues. Does look like the sensor comes off with some clips, snapped a pic of it with my phone while I had it off and will check to see if the number brings up an available part.
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My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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post #18 of (permalink) Old 04-07-2019 Thread Starter
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No luck with the number on google or a few parts site searches, may not be a part number?

Sure looks like it is made to be removed. Inclined to take it apart, but wife would not be happy if I screwed something up and put us down a vehicle.
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My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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post #19 of (permalink) Old 04-07-2019
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I've never heard of being able to replace just the sensor - don't think they are available like that. Pretty sure you have to purchase a whole new throttle body.

If you want, I'll just sell you mine if interested. Has less than 30k miles on it. Doesn't make much sense to waste the shipping charges back and forth for something that is only like $120 new (shipping back and forth will probably cost $30-$40)... Obviously, if it doesn't solve your problem, you can just send it back, but if you want to keep it, we'll work something else regarding price (I'm easy to get along with)... Just another option if interested.
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post #20 of (permalink) Old 04-08-2019 Thread Starter
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The tps is made to be replaced

Been unable to find a tsb specific to the 2012 and newer impala's, nor have I found a part number.
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My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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post #21 of (permalink) Old 04-08-2019
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That video only mentions cars up to 2011 though (including the Impala) - and the video was posted in 2017, so my guess is that the sensor alone is not designed to be replacable on the 2012+ Impala throttle body, which is probably why you can't find a part number. :-)

You can't replace a part that you cannot buy... I'm sure there are tons of GM's with that same throttle body, so if the part was available, I don't think it would be very hard to find the part number.
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Originally Posted by jtrosky View Post
That video only mentions cars up to 2011 though (including the Impala) - and the video was posted in 2017, so my guess is that the sensor alone is not designed to be replacable on the 2012+ Impala throttle body, which is probably why you can't find a part number. :-)
Makes no sense that the engineers would design it with the clips for the part to be removed if it was not serviceable. You may be right though, don't know. If you listen to the video a short ways in the tech says used to be that the throttle body would be swapped, but now they want you replacing the tps, he showed some documentation on that. So my thoughts were the tps probably did not used to be available for those either. The basic design of the one he changes is very similar to the one on your car as well as mine. It has the same style clips that allow the tps to be removed, doubt it would have a removable back if it was not intended to be able to be repaired, but who knows. May be just a matter of time before these start being sold, but for now you are right that there is not an available part or at least I have not found it.

I did find a new tb for $100 shipped. There are a few used on ebay from around $40 up.

My wife messaged me after she got to work this morning and said really was no change, car is still doing the same thing. Did not get a chance to try to capture live data yesterday, filter was still not dry.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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post #23 of (permalink) Old 04-08-2019
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Originally Posted by 12 lt View Post
Makes no sense that the engineers would design it with the clips for the part to be removed if it was not serviceable.
This seems to be connected to outsourcing. The assembly comes from an outside vendor to GM as one piece, and GM doesn't buy or distribute the individual pieces to their dealers.

The intake manifold tuning assembly on my 2013 Cruze cannot be serviced using any dealer available parts - the entire intake manifold is supposed to be replaced because one 29 cent plastic link won't stay connected

All that said, you would think that high wear items might somehow make their way into the parts channels. Regardless of whether GM or some upstream vendor makes the parts, there is demand for them, so it seems logical that those parts might make their way to somebody's warehouse (other than the sub-contractor's).

/rant

Doug

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If your socket set is all the same brand, you might be a city slicker.

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post #24 of (permalink) Old 04-08-2019
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It's kind of silly. Why would GM rather pay to replace an entire throttle body if the TPS fails during the warranty period? You'd think that would want to replace as little as possilbe under warranty.

Unless, of course, the vast majority of failires occur *after* the warranty is expired - then they really don't care I guess. :-)

I completely agree that you *should* be able to replace just the TPS - only problem is that you can't currently buy the part, so you're SOL, it seems.

At least the throttle body has come done in pricing - I seem to remember it being more expensive back when I looked at getting one and having it ported (instead, I ended up buying a used one that was already ported - was much cheaper that way).
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post #25 of (permalink) Old 04-08-2019 Thread Starter
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Originally Posted by jtrosky View Post
At least the throttle body has come done in pricing - I seem to remember it being more expensive back when I looked at getting one and having it ported (instead, I ended up buying a used one that was already ported - was much cheaper that way).
Yep, $100 for a new delco unit that comes with a 1 year warranty. Actually has me wondering how much the tps would cost if they do start selling them, if it would even be worth it to replace it with not replacing the motor since the motor is another point of failure. What is interesting is how broad the pricing is, same exact part at autozone is over $250 and some ebayers have the same part up around $275. Insane markup, guess some people buy before shopping prices.

Really wonder if the issue with our car is possibly a hanging motor and nothing to do with the tps, kind of felt like the butterfly was maybe just a little sticky at the very start of closed position or maybe just seemed that way. Will definitely be disassembling the current tb after I replace it.

Really is weird though, stab the gas from idle and it has a flat spot/hesitation for a fraction of a second around 700 rpm's before going on and accelerating. Once past that spot it has normal smooth acceleration. It is never rough or any out of the ordinary sounds. Hold the pedal at around 1200-1500 rpm's and stab it and it does not do it. Does not matter if you are in park or drive either. Which was why I thought it was more likely the pedal assembly. And there are no codes.

Oh well, wife is conscientious of the issue. Figure not long after I get it fixed gm will issue a recall or tsb on it. lol. Way my luck seems to go.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
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post #26 of (permalink) Old 04-29-2019
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^ 12 lt, did you ever get this resolved?
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post #27 of (permalink) Old 04-29-2019 Thread Starter
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^ 12 lt, did you ever get this resolved?
Thanks for the reminder to post an update. Kind of stumped really. Not too sure exactly what happened with our car with this, but for now I have held off on throwing more parts at the problem and have not yet changed out the tb.

My wife drives the car daily, she said the issue has become more intermittent. Really was strange how the hesitation would only be between around 700-800 rpm's and once past that point it accelerated as normal just as much power as the car had new. I got in the car recently and tried to replicate the dead spot and was unable to get it to hesitate. Car has not thrown any codes either, which does not help.

I am not ruling out the tb as being bad yet. I will definitely post back if something changes and what action is taken and whether it resolves the issue.
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post #28 of (permalink) Old 04-30-2019
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Being a GDI engine start with cleaning. These engines are notorious for carbon buildup on the intake valves. Techron and CRC make cleaners to address this problem.

Also clean the throttle body, mass air flow sensor and make sure the PCV system is clean and working properly.

If the problem is found to be carbon buildup on the intake valves installing an oil catch can may help reduce the buildup.
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post #29 of (permalink) Old 04-30-2019 Thread Starter
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Originally Posted by rjayl View Post
Being a GDI engine start with cleaning. These engines are notorious for carbon buildup on the intake valves. Techron and CRC make cleaners to address this problem.

Also clean the throttle body, mass air flow sensor and make sure the PCV system is clean and working properly.

If the problem is found to be carbon buildup on the intake valves installing an oil catch can may help reduce the buildup.
Thanks for the reply, will probably run some techron injector cleaner through the car, picked some up at walmart. I cleaned the tb and maf sensor a couple weeks ago, shortly after replacing the pedal assembly, and there was no change whatsoever in the hesitation. The tb was actually not nearly as dirty as I expected. This car had never had any issues with excess burning oil or oil blowback, and the air tube has had minimal oil in it. That being said, it was a little more than a half quart low last oil change, car does have quite a few miles on it though.

My wife told me this morning that the car has not had this issue again, at least not in the past several days. So this has me scratching my head as to what exactly was causing the hesitation and why no codes and what resolved the problem, why it went from every time you pressed the pedal to intermittent to no longer having an issue. When this problem was going on I could take the car out on the highway and stomp it from about 15-20 mph and it accelerated fine. Get on it from a dead stop and had the slight hesitation. Feather the gas past the hesitation point then stomp it and it was fine. This was why I initially thought the pedal or the throttle body had to be the problem. Please anyone chime in here on my thoughts/comments below, open to others thoughts.

Trash in the tank or dirty/clogged injectors would seem to me that there would be more performance/acceleration problems than just at the low rpm?

Bad gas, same as above, would likely not cause there to be only a low rpm hesitation? We typically run walmart gas, not had any past issues.

A tuneup issue, needing plugs or other ignition failure would likely throw a code, and again would likely not cause an issue only at low rpm's?

I don't think changing the pedal assembly would require the car to relearn anything, have read though that a tb replacement does require a relearn process?

About the only thing different I know of that I changed, was that I went to castrol edge with the last oil change from castrol magnatec. That should not have had any impact on performance.

When I had the tb off the car to clean it, there was a spot when working the butterfly that felt maybe just a little stiff, possible it was slightly hanging for just a fraction of a second and worked loose?

I still plan to get in the car sometime when my wife is not running in it and use my innova scanner to record live data.
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post #30 of (permalink) Old 04-30-2019
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If the problem is carbon atop the intake valves, don't think the Techron (or any cleaner/supplement) will do much on a di eng. where the high pressure fuel spray is directed into the center of the combustion chamber/cylinder. Fwiw, when I installed my ported tb, I didn't do a relearn procedure and had no issues.
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