Hyundai

Hyundai Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Hyundai
This answer was rated:

Won't rev past 3500. It runs fine at start up but when it

warms up,no power won't revue...
Won't rev past 3500. It runs fine at start up but when it warms up,no power won't revue past 3500 rpm
JA: Is the power loss consistent, or does it fluctuate?
Customer: It fluctuates up to about 4000 and back to 3500 at full throttle
JA: What year is your 4000?
Customer: 2004 huyndia sonata
JA: Are you fixing your 4000 yourself? What have you tried so far?
Customer: TPS anaMAFS
JA: Anything else you want the mechanic to know before I connect you?
Customer: Took it to shop they told me it was cats clogged up
Show More
Show Less
Ask Your Own Hyundai Question
Answered in 16 minutes by:
11/16/2017
Tim Mohr
Tim Mohr, ASE MASTER
Category: Hyundai
Satisfied Customers: 16,105
Experience: 30 YEARS EXPERIENCE, FORIEGN AND DOMESTIC, GAS AND DIESEL
Verified

Hi, my name is ***** ***** it runs good cold, but powers out when warm, then this is caused y a partially plugged cat converter, it can easily be verified by a exhaust backpressure test, was this test done?

Ask Your Own Hyundai Question
Customer reply replied 30 days ago
Not sure. It's a good shop I've used many times. I had removed the pipe from the header before taking it in, with no change. He told me the cat are made into the headers so that would not have made a difference.

no that wont make a difference, you need to remove the front o2 sensor and screw in a low pressure gauge, and start it, if the pressure is any more than 1 psi, the cats are plugged,Tim

Ask Your Own Hyundai Question
Customer reply replied 30 days ago
I'll try that. Could it be a knock sensor?

No, a knock sensor will not do this, the metal in the cat converter expands when it gets hot, and blocks the flow of exhaust, then contracts as it cools, so this is going to be a bad cat converter,Tim

Ask Your Own Hyundai Question
Customer reply replied 30 days ago
Cool thanks for the help. I'm going to work it now. Wish me luck.

Anytime my friend, please dont forget to rate me, so I can get credit for helping, thanks,Tim

Tim Mohr
Tim Mohr, ASE MASTER
Category: Hyundai
Satisfied Customers: 16,105
Experience: 30 YEARS EXPERIENCE, FORIEGN AND DOMESTIC, GAS AND DIESEL
Verified
Tim Mohr and 87 other Hyundai Specialists are ready to help you
Ask your own question now
Customer reply replied 30 days ago
I just gutted the cats and same problem. Runs great until it warms up. What do I try next.
Customer reply replied 30 days ago
I did as told but the problem persists. What do I try next?
David Craig
David Craig, Auto Mechanic
Category: Hyundai
Satisfied Customers: 4,201
Experience: Owner/Mechanic at 3D Automotive
Verified

you need to contact the original Tech since he has already been paid for the answer

Ask Your Own Hyundai Question

did you run a backpressure test on this, before gutting the cats??

Ask Your Own Hyundai Question
Customer reply replied 26 days ago
No,I do not have a pressure tester. So I removed the headers and o2 sensors and cleaned out cat material. Then replaced everything. Also removed check engine light from dash. This car has almost 300000 miles on it. I have replaced most of the suspension and top side of motor. Over all the car is in great shape and my wife loves it,so I need to fix this issue and life will be good. it runs great till it heats. When this started it was very intermittent. Would go great for days then suddenly go into limp mode. Now it happens a few minutes into driving it.

have you had the codes read from the computer?

Ask Your Own Hyundai Question
Ask Tim Mohr Your Own Question
Tim Mohr
Tim Mohr
Tim Mohr, ASE MASTER
Category: Hyundai
Satisfied Customers: 16,105
16,105 Satisfied Customers
Experience: 30 YEARS EXPERIENCE, FORIEGN AND DOMESTIC, GAS AND DIESEL

Tim Mohr 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 would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

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

< Previous | Next >

Meet the Experts:

George H.

George H.

Hyundai Technician

2,108 satisfied customers

Hyundai Gold certified, ASE Master tech 15+ years

Ron Z.

Ron Z.

- Hyundai Tech -

642 satisfied customers

18+yrs experience. State Inspector and Hyundai Diagnostics

Chris (aka- Moose)

Chris (aka- Moose)

Technician

578 satisfied customers

16 years of experience

K. Wiggins

K. Wiggins

ASE Certified Technician

345 satisfied customers

ASE Certified Technician, Associates Degree in Automotive Technology, 15+ years in the trade

Mike Kelly

Mike Kelly

Hyundai Mechanic

259 satisfied customers

17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.

Daniel

Daniel

Hyundai Technician

247 satisfied customers

Hyundai technician

Tim Mohr

Tim Mohr

ASE MASTER

16,105 satisfied customers

30 YEARS EXPERIENCE, FORIEGN AND DOMESTIC, GAS AND DIESEL

< Previous | Next >

Related Hyundai Questions
I replaced a light bulb on my Hyundai Sonata (2011). Alter
I replaced a blown light bulb on my Hyundai Sonata (2011). Alter replacing the worn out bulb, it will not light up. I suspect it may be a blown fuse. … read more
Dan
Dan
Dealership Technician
Associate Degree
1,723 satisfied customers
We have a 2005 Sonata and would like to know if we can flat
We have a 2005 Sonata and would like to know if we can flat tow it with our RV. … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Keys are locked inside of a 2016 sonata truck. 20 plus.
Keys are locked inside of a 2016 sonata truck. JA: How many miles are on the car? Has this ever happened before? Customer: 20 plus JA: Are you fixing your Sonata yourself? What have you tried so far? … read more
Jared D
Jared D
Shop Supervisor
Bachelor\u0027s
3 satisfied customers
I was riding my Honda sonata and in the middle of the road,
hello, I was riding my Honda sonata and in the middle of the road, all of a sudden, it stopped and gears got locked. Police came and unlocked the gear/transmission with a screw driver. This is very un… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
Im trying To start m'y Hyundai sonata. Bu. 2010 sonata gls
Hello JA: Hello. How can I help? Customer: Yes JA: What is the model/year of your Hyundai? Customer: Im trying To start m'y Hyundai sonata JA: Will the headlights turn on? Is the battery fully charged… read more
indy-tech
indy-tech
Shop owner, technician
Vocational, Technical or Trade Scho
11 satisfied customers
Trying to adjust headlights on my 2009 sonata and 2011
trying to adjust headlights on my 2009 sonata and 2011 accent, cant find adjusters. please help!… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
578 satisfied customers
Starts but won't run. 2000 sonata. Checked fuses was running
Starts but won't run JA: Have you checked the battery, particularly the terminal connections? Are they corroded? Customer: Yes JA: What is the model/year of your Hyundai? Customer: 2000 sonata JA: Are… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
578 satisfied customers
I havea 2012 sonata gls.When I try to start it,it starts the
I havea 2012 sonata gls.When I try to start it,it starts the alarm … read more
Peter Bagley
Peter Bagley
master technition
Vocational, Technical or Trade School
954 satisfied customers
How much current should a 2011 Hyundai Sonata Hybrid draw
How much current should a 2011 Hyundai Sonata Hybrid draw from its auxiliary battery when vehicle is turned off and all doors and trunk shut? … read more
Kavey
Kavey
86 satisfied customers
The timing belt on my 2005 Hyundai sonata broke while I was
The timing belt on my 2005 Hyundai sonata broke while I was driving on the highway. Is it worth getting the belt put back on or has too much damage been done in the engine? … read more
Kevin
Kevin
workshop foreman /master tech/mot tester
0 satisfied customers
2011 Sonata, trunk won't open with the button or the key. In
2011 Sonata, trunk won't open with the button or the key. In fact, the key won't even go into the lock. … read more
Andrew Martin
Andrew Martin
Level A Technician
Technical Certificate
320 satisfied customers
I have a Sonata 2005. It starts and run,but when I push the
I have a Sonata 2005. It starts and run,but when I push the gas pedal in fast it do not stop but drops rpm util I let go of the pedal. Put is in slowly it will rev up but a little hesitantly. If I sta… read more
baddad1
baddad1
technician
High School or GED
5 satisfied customers
I have a 2010 hyundai sonata that overheats. i took it to
Hello, i have a 2010 hyundai sonata that overheats. i took it to shop and they said they couldn't fix it because there is no check engine light on. … read more
George H.
George H.
Hyundai Technician
Associate Degree
2,108 satisfied customers
I have a problem with my hyundai sonata car 2014. A little i
a little i have a prob;em with the system of auto lock and unlock … read more
indy-tech
indy-tech
Shop owner, technician
Vocational, Technical or Trade Scho
11 satisfied customers
2013 Sonata. I flipped the switch near the latch to the
2013 Sonata. I flipped the switch near the latch to the locked position to prevent unauthorized entry. The key goes into the key slot near the tag but won't turn. Can't open trunk. … read more
vwtech0405
vwtech0405
VW Technician
Associate Degree
8,868 satisfied customers
I have an 07 sonata with no commutation. it will power up
i have an 07 sonata with no commutation. it will power up the scanner when i plug it in, it will connect with the abs and air bag, not the engine and trans. checked power at aldl, good, check the diag… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
578 satisfied customers
2011 Hunday Sonata, horm not working...the fuse and the
2011 Hunday Sonata, horm not working...the fuse and the relay and the horn are good. The blower motor work only on number 4..on high speed. The car have only 31k miles but its had little bit water in … read more
trung do
trung do
CERTIFICATE OF ACHIEVEMENT
98 satisfied customers
2002 Hyundai Sonata will crank but won't turn over. The
2002 Hyundai Sonata will crank but won't turn over … read more
baddad1
baddad1
technician
High School or GED
5 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