Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

Where is the throttle positioning sensor of my 2005 Chevy

Customer Question
Coblat LS. If this a...
Where is the throttle positioning sensor of my 2005 Chevy Coblat LS. If this a do it yourself job or 500.00 at the mechanic?
Submitted: 7 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 10 minutes by:
11/5/2010
Chevy Mechanic: Jay, Chevy Mechanic replied 7 years ago
Jay
Jay, Chevy Mechanic
Category: Chevy
Satisfied Customers: 596
Experience: Several yrs experience, GM Trained,
Verified
Do you have a check engine light on and is the engine missing?
Ask Your Own Chevy Question
Customer reply replied 7 years ago
the engine light is on steady. No, it does not seem to be missing. It just idles rough when I come to a stop, and sometimes will stall. It starts right up again though. The code that came up was P0178, if that helps any?
Chevy Mechanic: JHoop, Chevy Technician replied 7 years ago
JHoop
JHoop, Chevy Technician
Category: Chevy
Satisfied Customers: 5,446
Experience: 14 Year Engine Builder,16 years as a Tech HvyLine, Suspension, Electrical, Brakes, 6 Year Shop Owner
Verified
Hello , my name is***** you for choosing justanswer.com.

Are you sure about the code PO178 as that is not a code in any of my databases?
Ask Your Own Chevy Question
Customer reply replied 7 years ago
No, I am not sure, I have it written down at home and I am out of town until tonite. Are you Jay?
Chevy Mechanic: JHoop, Chevy Technician replied 7 years ago
No, I am a new expert. I can help you if you supply the correct code here. I will keep your question open. You can get back to me anytime answering any e-mail sent to you related to this question or by logging into your JA account. Thanks again, JHoop
Ask Your Own Chevy Question
Customer reply replied 7 years ago
Will do. Thanks.
Chevy Mechanic: JHoop, Chevy Technician replied 7 years ago
Great. Have a nice day, JHoop
Ask Your Own Chevy Question
Chevy Mechanic: Jay, Chevy Mechanic replied 7 years ago
Hello,Customer this is Jay, JHoop is correct in that code P0178 does not exist, therefore you may have made a mistake in writing the code down or in your memory. Please check again and repost. In just what you are mentioning it may be a catalytic converter issue, but I don't want to jump to any conclusions. Let's wait till we have the correct code. Thanks.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
The codes are P0171 and P0128
Chevy Mechanic: Jay, Chevy Mechanic replied 7 years ago
O.k. That helps more! P0128 is likely being caused by a faulty thermostat, so your best bet would be to change the thermostat. P0171 is a lean condition get an appropriate cleaner such as brake clean and spray out the MAF sensor. Also make sure there are no intake leaks such as the air intake not hooked up properly. Do you use an oiled air filter? Please reply if this does not help, thanks! Feel free to reply to the air filter question.
Jay
Jay, Chevy Mechanic
Category: Chevy
Satisfied Customers: 596
Experience: Several yrs experience, GM Trained,
Verified
Jay and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 7 years ago
What is the MAF sensor and where is it located? I just recently changed the air filter and had a hell of a time replacing the cover. The light came on a couple of days after that, so maybe I didn't seat the cover properly. I don't use an oiled filter. I just put it in right out of the box. The problem with the rough idle and stalling started a few weeks before and the engine light had not come on. My original question was about the throttle positioning sensor? Would a faulty one cause the rough idle and stalling problem?
Chevy Mechanic: Jay, Chevy Mechanic replied 7 years ago
I don't think your throttle position sensor is the problem because you would likely have other issues and codes. The MAF sensor is located just past the air filter in the air intake stream so my guess is that you didn't seal the air filter box. Once you have replaced the thermostat and sealed the air box please report and let me know how it is running.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
Is it attached to the wiring harness just past the air cleaner? Should I clean or replace the sensor as well?
Chevy Mechanic: Jay, Chevy Mechanic replied 7 years ago
it is just past the air cleaner. It measures air flow and is inline with air intake.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
Thanks. I'll try it.
Chevy Mechanic: Jay, Chevy Mechanic replied 7 years ago
Remember, please reply after you have done these things and let me know how it is working. If it has not fixed it then we'll continue to figure it out.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
Hi Jay,

I cleaned the sensor, checked the air cleaner cover and it seems to have improved the idle. I don't think the thermostat is malfunctioning though since my heat works well. I reset the engine light and it stayed off for 2 weeks. When it came back on, the only code was P0128. Anti-freeze level is fine. I may try changing the ECT sensor when I get a chance.
Chevy Mechanic: Jay, Chevy Mechanic replied 7 years ago
O.k., although I'll let you know that in my experience a P0128 code usually is related to a thermostat that is not working correctly. Thanks.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
Is the thermostat something that I could replace on my own or should I leave it to the pro's?
Chevy Mechanic: Jay, Chevy Mechanic replied 7 years ago
Thermostat on these is a touch difficult and perhaps would be best to take it into a shop to get it done, Please reply if you have any questions, thanks.
Ask Your Own Chevy Question
Customer reply replied 7 years ago
Just letting you know, I had the thermostat and sensor replaced and the problem is solved.
Ask Jay Your Own Question
Jay
Jay
Jay, Chevy Mechanic
Category: Chevy
Satisfied Customers: 596
596 Satisfied Customers
Experience: Several yrs experience, GM Trained,

Jay is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,289 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

8,866 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,918 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
1989 5.7 liter throttle body engine. I was driving, engine
1989 5.7 liter throttle body engine. I was driving, engine was running fine, and came to stop sign. Upon trying to accelerate from the stop, the engine would hardly run. Bad miss and backfire visible … read more
rpmdiag
rpmdiag
High school
7,268 satisfied customers
I have a 2016 chevy sivarado 4x4 v8 5.3. the check engine
I have a 2016 chevy sivarado 4x4 v8 5.3. the check engine light came on . took it to an auto zone &they read a P219A code. what is wrong ? … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,289 satisfied customers
The reduce engine message and the engine light on and alot
the reduce engine message and the engine light on and alot if shacking when I started it this morning … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
CHECK ENGINE LIGHT CAME ON AND READING 3 CODES: P0171,
replaced the gas cap, replaced the intake manifold gasket, replaced the evap purge solenoid … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Getting reduced engine power messages a lot. Usually stop
getting reduced engine power messages a lot. Usually stop car turn off ignition and restart and the problem clears. I have a code that shows the catalytic converters need replaced which I am working o… read more
roy
roy
Associate Degree
3 satisfied customers
Check engine light on engine hot ac off message. Stay on.
check engine light on engine hot ac off message JA: Does the light stay on, or does it blink? Customer: stay on JA: What is the model/year of your Chevy? Customer: impala 2006 JA: Are you fixing your … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
I have a 2013 Tahoe with 5.3 engine. The service engine
I have a 2013 Tahoe with 5.3 engine. The service engine light comes on when the temperature drops below 45 degrees. It will go out when the temperature is above 45 or 50 degrees. The code it sets is P… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
The service engine soon light came on. I changed gas
the service engine soon light came on. I changed gas stations the other day. it could be water in the tank … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
My catalytic converter went on my 2008 Impala I think
My catalytic converter went on my 2008 Impala I think because I had a wiring problem that made the fuse blow that controlled the circuit for the O2 sensors. Also I had a AIR valve that was stuck in th… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
My catalytic converter failed a couple of years ago. I think
My catalytic converter failed a couple of years ago. I think it was a combination of a stuck AIR valve and a wiring problem that kept causing the fuse that controls both O2 sensors and the EVAP soleno… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
The engine and traction control lights are on, and there is
The engine and traction control lights are on, and there is a "service traction" message on my 2011 Malibu. … read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
I have a 1987 chevy g30 rv van with a 350 engine with
I have a 1987 chevy g30 rv van with a 350 engine with throttle body. When I go up the smallest hill I loose power. it sounds like a 4 bbl carb kicking in but no power. I let off the gas and I have a l… read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
I Want To Take Out The CATALYTIC CONVERTERS on my 2005 chevy
I Want To Take Out The CATALYTIC CONVERTERS on my 2005 chevy malibu can i disconect the stabilyzer ends and tist it to remove the cat … read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
Check engine light on checked fuel cap no problem there -
Check engine light on checked fuel cap no problem there - already replaced the catalytic converter when this happened before -is this most likely the same issue? 2013 2500hd duramax … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Pete again, lack of power like a catalytic converter is
Hey Pete again, lack of power like a catalytic converter is stopped up or air filter stopped up, no codes, checked back pressure on pre-cat 02 sensors and after cats, doesnt appear to have stopped up … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Knock sensor on bank 2, catalytic converter on bank 2 codes
knock sensor on bank 2, catalytic converter on bank 2 codes on 4.3 liter 2011express van … read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,734 satisfied customers
The catalytic converter. Is it worth the cost to replace it?
the catalytic converter. Is it worth the cost to replace it? … read more
Ron Z.
Ron Z.
- Chevy Tech -
Vocational, Technical or Trade Scho
2,734 satisfied customers
I have a 2003 Chevy Venture minivan. Catalytic converter
I have a 2003 Chevy Venture minivan. Catalytic converter light popped up and mechanic says it needs to be replaced. It is California emissions and my mechanic says it will be expensive to do, between … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x