loss of power

There is a diagnostic fault code in memory. If this was an intermittent problem, restarting the engine would restore normal operation but if the problem that was detected is relatively serious, the check engine light will still turn on any time the engine is running. That is the second most serious type of code, but that does not necessarily mean the problem was serious. The check engine light turns on when the fault code relates to something that could adversely affect emissions. When those problems act up, the light will be on.

These guides will help us

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/engine-has-low-power-output

Please run down these guides and report back.

When stopped at an intersection or sometimes upon acceleration, when I apply the gas peddal, I feel the engine lurch forward... not a good feeling. What could it be? My Hyndai dealer wants to run an electrical scan to diagnose the problem, but I would like to have the heads up on the issue.

Thank You,
E

Hi elsol1,

Thank you for the doonation.

Is the any warning indicator showing while driving?
What is the engine idling when stopped?
Any other issues with performance?
When problem occured, was the gear shift engaged in Drive all the time?

Thanks for the reply! No indicator lights showing at all.
I've got my foot on the brake at the intersection and the gear shift is engaged in Drive the entire time.
Yes, the care is idling, normally.

I had the oil changed less than 3,000 miles ago at Fletchers and they changed the air filter too. Awhile after that I noticed this jerking/lurching, like the SUV wants to take off on its own.

Last week I had Hyundai dealer perform the 45,000 mile check up on the Santa Fe hoping that with topping off all the fluids and checking hoses and transmission they might find something, but no such luck.
What do you think?

When there is any vacumn leakages, surging would occur and that would cause the symptoms described.

I would suggest checking for dislodged vacumn hoses.

Does problem occur with AC turned on all the time? If yes, it could be the AC compressor engaging or disengaging and that could be caused by slow response from the IAC. Cleaning it should improve on the situation.

Thanks so very much for your response. I've been busy working with the Hyundai dealer, and a private mechanic, trying to come up a resolution to this problem. Well, Problem solved!

No Thanks, to the dealer...The privately owned mechanic took my car out for a test drive and attached a diagnostic box to the electrical panel and decided that it was missing, not lurching. So, he changed the spark plugs...4 to be exact. $74.00 later, I was a happy customer. All this in an hour!

I love the fact that I can speak to the mechanic directly without the middle man at the dealership. This saves time, and money. Thanks to you, and to this great website for giving me the confidence to seek another opinion other than the Hyundai dealership.

Thank you for the input.

Glad that you have resolved the problem.

Have a nice day.

Thank you for using 2carpros

120Kmh is hardly reached or passed

Can you feel if the transmission is slipping in lower gears? that is do you feel that it is revving hard and not driving as you would expect?

Yes, I feel it the acceleration peddel

Better get the transmission looked at, it may be the problem, if the transmission oil is dirty and smells burnt it will be slipping start here.

Also when you start it the rev pointer goes below the idle level and the pointer goes up and down.
It also gives backfire when reaching 120kmh but now it backfires even at 40kmh

I feel that you better start looking at the tune and check that the idle control motor is working, start with the tune side first and see how that improves things.

Hello Dear 2capros
My problem in my car is when I go drivig uphill it loses power, and then I I used the triptronic option but I saw that the car was stuck in third gear,several days ago I saw that the engine revolutions are greatly increased for the gear change , the transmission fluid is well and the level is well too....any advice you can give me?
Thank you.

Please can the fuel filter cause any of the mentioned problems or play a role

scan for codes and check fuel pressure with a gauge.

You need to do the fuel filter as part of the tune, a badly blocked fuel filter can cause some of your problems.

Hi again Dear 2carpros.
Thank you so much for your quick answer

I hace scaned my car I gave a Cod P0732 T/A 2nd gear ratio, the mechanic said it is a problem with a second gear, may be a transmission sensor not work or speed Sender not good, or the electovalvle inside of transmission broke, can you tell me? What do you thing???
Thank you again.

Best regards

Elvin

Ok I will THAT and get back to you. Thanks

its' best to take to a trans guy on this as it sounds internally damaged.

ok, let me know what you find.

Where is the fuel filter located

I was leaving for a trip and vehicle lost power trying to go up an hill/incline. When I stopped and turned off to look under the hood and got back on road. it ran fine until another hill. I came back home instead of finishing the trip. When I went to fuel up I check the check mileage. I usually get about 20 MPG, this 100 mile trip I only got 6 MPG. No engine lights have ever come on and had mechanic check for codes. His opinion is that it is the transmission. 1,300 miles ago the dealer changed and cleaned AT. Any help to find something else to check?

Can a leak around the gear box also cause the feel in the rev; thus in acceleration peddel. There is a leak of transmission oil at the left shaft joint and Also the 4wd attachment.
Today we used these autofix machines on it and most of the detected faults were Air related

check fuel pressure with a gauge auto parts rent gauge then have a transmission specialist look at it.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Unless the transmission is very low on oil it should not give you there symptoms that is unless the transmission is failing, but I feel that it is engine related problem.

Hi Dmdougherty,


For your convenience I have included a link to Amazon.com fuel pressure gauge page.


https://www.amazon.com/gp/search/ref=as_li_qf_sp_sr_il_tl?ie=UTF8&tag=2carprcom20&keywords=Fuel_pressure_gauge&index=aps&camp=1789&creative=9325&linkCode=xm2&linkId=605f3a92fb400af06465c1566134514b

Thank you for visiting 2CarPros.

Kindest regards,


Renee
Admin

I found out dat the purge Control valve was not properly connected.
Can the viscosity of the Engine oil affect the performance of Engine. Relating to speed and sound

Not on your car re oil viscosity and sound has no bearing what so ever.

I use 5W40 but changed it to 15W40. Any warnings or worrys?

why did you do this?

i had the engine light come on, had it code checked came back as p0120 asn p0121. vehicle ran great, started fine idled fine, now suddenly has no power, or acceleration. I changed the tps, and the engine light went off, but still has no power or acceleration What seems to be the problem?

Over site. I recently got to know of it

try cleaning throttle plate on both sides with choke cleaner and tps area. it may be a bad throttle body.

Go back to the 5W weight oil.

I will try that. I also switched back the old tps, and loosened the throttle cable, it has given me some power back, but not much. I can get to speeds of 60-70 it just takes a while and any slight incline is a struggle, but it does respond to needing more fuel. I will update once I cleaned the throttle plate. Thank you.

check fuel pressure with a gauge as well. Most auto parts stores rent it.

The plate is clean, but still no power. Regarding the fuel pressure I am not sure, nor do have the knowledge to do it. I did try to pull any codes from it, but as the light is off no codes were found. Swapped back the old tps, and still same thing no power, and does not really respond to pushing the throttle.

This morning on the way to work, when my car got up to about 40 MPH on the highway, it seemed to "bog" down and lose power. All my fluids are proper levels and colors, my belt is in good condition and is working properly, and no indicator lights have come on in my dash. I am afraid it may be an issue with my transmission?

Just had my car repaired for the same problem. 94,000 miles 2001 santa fe. Mine seemed to be a transmission problem, not up shifting into higher gears caused by catalytic converter located under front seats. Have that one checked for blockage and if so replace it. No check engine light displayed.