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Rixster
Rixster, ASE Certified Technician
Category: Car
Satisfied Customers: 282
Experience:  Owner Rix Automotive & Mobile Repair 27+ Years Exp. with all makes and models cars and Lt. Trucks
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2003 KIA SORENTO: HILL..DROPS..45 50 mph AND THEN THE VALVES START

Resolved Question:

I HAVE A 2003 KIA SORENTO AND WHEN I START UP A HILL IT LOOSES POWER AND THE SPEED DROPS TO 20 MPH WHEN IT USE TO BE 45 50 MPH AND THEN THE VALVES START TO TAP AS I AM LOOSING POWER
Submitted: 8 years ago.
Category: Car
Expert:  Rixster replied 8 years ago.

Hello! I'm Rixster...

I'm going to help you out on this but I need some info first...

How many Miles on this vehicle?

How Long has this been going on?

Customer: replied 8 years ago.
it has 67000 and it started about a week ago and then today it only hapend 2 times also the check light came on. we had the top of the motor rebuilt with a new head on one side and 2 pistons replaced about 1 year ago. it only hapens when going up a hill.
Expert:  Rixster replied 8 years ago.

I think I would have the exhaust system checked. You may have a plugged or partially restricted exhaust. This problem would be more prevalent under a load such as your hill climb.

You should be able to take it to any reputable exhaust shop for this check.

They should be able to make recommendations from there.

 

If this answer has been helpful please ACCEPT the answer.

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Bonuses and Positive Feedback are greatly appreciated as well.

If there is anything else I can help with please do not hesitate to contact me.

Thanx! -Rixster

Customer: replied 8 years ago.
ya but what is the differance if the rpm is 4000 on flat road or up a hill it does not do it on the flat
Expert:  Rixster replied 8 years ago.

There is a big difference!

Under load you are using more throttle hence pushing more air thru your engine.

If there is a defect in a muffler or catalytic converter it can cause your "lack of power" problem and make the engine heat up hence causing your valvetrain noises.

 

What were the DTC's that were set? (you said you had a check engine light come on)

Customer: replied 8 years ago.
NOT SURE WHAT YOU MEANT WITH DTC. IF IT WAS RESTRICTED WOULDENT IT DO IT ALL THE TIME
Expert:  Rixster replied 8 years ago.

DTC is Diagnostic Trouble Code.

And No It may not do it all the time that's why I said a possible "defect in a muffler or catalytic converter". If the converter is degraded or broken up on the inside you may not see it effects until it re-positions itself like when you are going up a hill.

The Muffler shop should test this for free.

You can also tell if you hit the converter gently with a mallet and it makes a "rattle" noise it's bad. But as I stated it "COULD" be these things.

Do you know what codes were tripped???

Customer: replied 8 years ago.
NOT YET THE LIGHT JUST CAME ON TODAY IT WAS SOLID IT DID NOT BLINK AT ALL. WITH IT BEEING NEW YEARS DAY I COULD NOT TAKE IT ANYWHERE TO CHECK THE CODES.
Expert:  Rixster replied 8 years ago.

I understand that for sure.

Have the codes checked and we'll pick it up from there. Is that Cool with you?

Rixster and 2 other Car Specialists are ready to help you
Customer: replied 8 years ago.
OK
Expert:  Rixster replied 8 years ago.

Great

Customer: replied 8 years ago.

I HAD THE CODE CHECKED AND IT WAS CYLINDER ONE MISFIRE.

Expert:  Rixster replied 8 years ago.
A Misfire can cause all the problems you've described as well as degrade the Catylitic Converter. Have you had that exhaust system checked out yet?