New Throttle body??? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > Air Induction

Air Induction Performance Air Intake/Air Induction Modifications

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  #1  
Old 02-18-2010, 01:12 PM
robriguez's Avatar
robriguez robriguez is offline
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2006 GMC Envoy Denali
Black 5.3L V8 4X4
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New Throttle body???

I havent posted here in a while but I have a feeling i will be a regular in short order.

I have an 06 Envoy Denali and have had various issues with what I will call electrical problems. (ignition switch changed twice, gear select sensor, some solenoid that prevented the vehicle from shifting out of park, PCM re programmed, ECU Reprogrammed, cam sensor, some gas pedal sensor, and a few other items that I cant recall just now).

Anyway, vehicle has 65k and in the last 2 weeks has been displaying an egine light. Now after driving more than 5 min, it will go into limp mode with traction control turned off and a second larger engine light appearing. Dealer says theres 6-7 different codes (I dont know what codes yet). Extended warranty is paying for most but dealer is saying i need a new throttle body. I have enver in my life ever heard of any vehicle needing a new throttle body. Extended warranty said they will not pay for a new one either ($560). WTF!?!?

I have had the throttle body cleaned every 20k by the dealer (based on how frequently the topic is brought up here) and now they say I need a completely new one. Have any of you ever needed a new one? What causes it to get so dirty/caked up to begin with?

With my wife out of work atm there is no way i can afford this. Any help or suggestions would be greatly appreciated. Thank you.
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  #2  
Old 02-18-2010, 01:29 PM
Enell Enell is offline
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2003 Chevy TrailBlazer LT
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From what I can tell your engine and TB's are quite similar, so replacing the throttle body shouldnt be hard at all, and actually cleanning it isnt either. I know there is an how to for TB's, but Im sure its done very similar.
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  #3  
Old 02-18-2010, 01:36 PM
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the roadie the roadie is offline
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Reduced Engine Power issues are usually caused by a mismatch of the sensors in the accel pedal OR the throttle body. To prevent runaway vehicles like Toyota had a few of, there are two independent sensors on the pedal, and they have to agree with each other at all times. If one breaks, it could fail in a way that wants to go to WOT. That would be bad. So there's two sensors.

Same way on the throttle body. The throttle body is controlled by a stepper motor, but it has to report back to the PCM how open it is. If there was only one sensor, it could fail in a way that would report back to the PCM that it was CLOSED, so the PCM would send a command to open more and more until, yet again, you could be at WOT and not want it!

You might have been the victim of misdiagnosis before, which can happen easily when you have intermittent electrical problems. A pedal sensor error can also come from a chafed wiring harness on the FAN CLUTCH even, because they share the same voltage reference circuit from the PCM. A good mechanic is keeping up with all the TSBs and documents that explain the subtle details of the control systems.

If you've been PAYING the dealer to clean the throttle body without having erratic idle, you might have been wasting your money. I also think you haven't been paying attention to the reports here, which is the I6 throttle body is the only one that needs cleaning, not the V8, because the V8 has a PCV valve that prevents gunk from getting the throttle body backside dirty, and the I6 design omitted this valve. If you were doing it yourself, you might have noticed the throttle body was ALREADY clean. The dealer might have been cheating you if they recommended it, but if you went in by insisting it needed cleaning, what were they to say?

What might be bad is the throttle body position SENSORS, and they might have been damaged by the excessive dealer cleaning. I think they are separately cleanable, so putting in an entirely new unit might not be necessary.

But if it is, and budget is an issue, then just get one from a junkyard. www.car-parts.com shows plenty of them in the $100-200 range. Also available on Ebay.

What kind of extended warranty contract will work on some parts of the engine control systems and not others? I don't get it.



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  #4  
Old 02-18-2010, 04:38 PM
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robriguez robriguez is offline
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Hi Roadie,

1) Thank you for you response!
2) The dealer recommended the tb be cleaned the first time. Since i remembered seeing it here ALOT I requested it the additional 2 times. It was only $50 each time I think so, while it sux it was done needlessly, its not the end of the world
3) Im going to talk to them again when I go to pick the truck up today but he clearly said the throttle body itself has to be replaced, not the sensors. Had he said it was only the sensors, I can understand them failing and probably would have never created this post. Unless the sensors are a built in part of the tb?? Why would they do that?
4) The factory warranty ran out @ 35k so weve been paying out of pocket for all of these electrical issues to the tune of over $2k. When we decided to buy out the lease and finance the truck I asked for a B2B extended warranty. They gladly extended it to 100k and told us EVERYTHING is covered (sans wear items) I didnt want to have to keep paying for this crap. NOW the warranty company tells us they will cover everything except for the tb. Makes no sense. That is not a wear item. So, Im having them fix everything that IS covered and I will battle the tb issue once I get the truck back.

To the guy that PMed me, depending on how things turn out I will gladly take you up on your offer.
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  #5  
Old 02-18-2010, 06:29 PM
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the roadie the roadie is offline
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Thanks for the details. The sensors are indeed integrated into the TB assembly. ACDELCO Part # 2172422 {GM #12580760} $164 at rockauto.com, $166 at parts4chevys.com. List price $266. Where did your dealer get the $560 crap? Three hours labor at $100 per?



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  #6  
Old 02-20-2010, 11:25 PM
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robriguez robriguez is offline
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Well, wife picked up the truck today and I guess maybe I do need a new tb if I keep getting these codes.

Heres the writeup they gave her.

Codes: c0455, c0196 - replace SWPS and reprogram VSEV. - $ 125 parts, $265 labor
---
Codes: p2135, p060e, p121 - reprogram pcm. $159 labor
---
Codes: p0171, p0174 - No Action, could not confirm.
---

Also, off topic but related, when they called to say we could pick up the truck today they said my battery was showing weak cca (been 4 years and 65k so, ok maybe im due). They wanted $95 for a new one. Figured that sounded close to the right price, save me the hassle, why not...Im looking over the bill and they charged $106 labor. WTF!?!?!?!?!? $207.65 for a BATTERY!!!!!!! That #&^%$% service manager will have at least one new @$$whole by the time im done with him on monday!!!!
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  #7  
Old 02-21-2010, 12:59 AM
WOOLUF1952 WOOLUF1952 is offline
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That $159 for PCM reprogramming seems way too much also.
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  #8  
Old 02-26-2010, 02:06 AM
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robriguez robriguez is offline
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Effers couldnt give a crap about my complaint. Told me I should have done it myself. OK, onto the next GMC dealer. There are only 4 in a 15 mile radius of each other..... Stupid

Anyway, still getting codes, still pointing to the tb. So as soon as there is available fundage I guess I'm off to rockauto.com. Or would you gurus recommend oem GM replacement only for the tb. Or sorry, the "Throttle Control Actuator" :-P

I would assume, make sure to disconnect negative battery cable, use new gasket, use proper tq not hulk strength and guess and give the truck some time with the key in the "on" position before starting to recognize the new sensors? Yes, no, any other tips?
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  #9  
Old 02-28-2010, 08:34 PM
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robriguez robriguez is offline
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anyone?!
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  #10  
Old 02-28-2010, 09:07 PM
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my advice, dont take it back to that dealer, and get a new throttle body and do it yourself. you're getting ripped off big time.
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