Question about 2007 Hyundai Accent GS Hatchback

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Why do my car slow down going up hills.and go normal on straight roads

Lose power on hills.standard trans.

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Sounds to me it could be a plugged catalytic converter. the symptoms are runs good , no strain, or on the flats, then loses power with exertion, or long uphill to the point you think it's going to just quit on you. easy test is to unbolt the catalytic inlet, and give it a quick test run. sometimes you can tell by having someone race the engine while you monitor the exhaust to see if enough comes out of it. usually happens over 75,000 miles

Posted on Apr 06, 2016

Testimonial: "tank you very much for your help.my car has 164.543 kl.and it sounds like i will need a new catalytic converter.thank you for your help."

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May be I have to make my problem clear. The car goes ok when I drive it on plain roads. But moment comes to up hilly roads car loses power and almost stall. it makes only very tardy slow move up hill.


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NO POWER / SHUDDER


Is it a standard or automatic transmission? If standard, your clutch may be slipping. While driving down a straight road, push the brake while still in gear and push the gas pedal as well. If the engine slows with the vehicle, the clutch isn't slipping. If the engine speeds up while the vehicle is slowing down, the clutch is slipping.
If it is an automatic, check the transmission fluid. You may be low and the transmission is slipping while under load, or the torque converter is slipping for the same reason. You may have a bad torque converter clutch switch, but the computer should have picked that up and made your "Check Engine" light come on.
These are the main reasons you would be losing power going up hills unless your engine isn't powerful enough to handle the larger tires on extreme hills. (It takes more power to turn a larger wheel going up hill since the vehile has to travel further for each revolution of a larger tire. Incidentally, have your speedometer checked. You will be going faster than what the speedo says since you put larger tires on.) Good Luck.

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