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sprinkles08, ASE Certified Technician
Category: Car
Satisfied Customers: 21438
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Hyundai Santa Fe GLS: Have 125,000 on my 2004 Hyundai, 6 cyl.

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Have 125,000 on my 2004 Hyundai, 6 cyl. In the last month the car will suddenly lose power, this happens at varies speeds and times, I have to pump the gas pedal to get it going again or sometimes it will just accelerate on its own. There's times were I stop at a light and the engine dies and I restart and then have no power to accelerate. The timing belt was changed at 95,000 and the car was just tuned up 4 months ago. I hate to drive it any distant or on interstate highways because of this issue.

Hello and welcome to JustAnswer!


There are quite a few things that could potentially cause your symptoms. Even though the engine light hasn't come on the first thing I would recommend is checking for fault codes. There could be a code or one trip failure setting when this happens yet the engine light isn't turning on.


If it won't set a code then it will really need to be diagnosed by watching data while the problem is happening. Another option would be to install a data recorder on it and then a technician can play back data that happened during the event at the shop on a computer.


Possible causes could include low fuel pressure, upstream oxygen sensors, MAF sensor, a limp-in due to lack of cam or crank signal, or ignition issues, but based on your description it sounds like you may have an electronic throttle control issue. This engine uses electronic throttle control where a sensor tells the ECM how far the throttle is open and then it controls the throttle body accordingly. There's a good chance the throttle body itself is causing this.

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