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What would cause the engine to be jerky under hard throutle 2006 expediton about 67,000 miles

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Shouldnt it still be under warranty? if it is i would take it to the dealership and let them deal with it. it could be getting to much or not enough fuel/air making it almost die out for a second and then turn back on. not positive though

Posted on Nov 12, 2010

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Check your transmission fluid level as soon as possible.
If you are experience hard transmission shifts, it is possible that the only problem is a low transmission fluid level. Low transmission fluid level can change the operating pressures of the transmission as well as reduce the amount of lubricant present between the clutches and bands and raise transmission temperatures. All these things can cause hard or jerky shifting. You need to identify why the transmission has a low fluid level and refill it as soon as possible.

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2006 Hyundai Sonota (67,000 miles) and the check engine light came on. Autozone checked it out and got a P2191 code. The car is running fine.


The description for this code is "System too lean at higher load (multiple) (Bank 1)" - it means after two trips, your car's computer is unable to set the proper air/fuel mixture based on the info it receives from, among other things, the O2 sensors in your exhaust system, the Mass Air Flow sensor, fuel injectors, etc.

Possible causes:
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The diagnostic process is pretty involved - go to www.hmaservice.com, register for an account (free!) - they'll email you a password, which you can use to login to their site and get way more info than you'd ever want on your car.

Good luck, and if this helps, please say so by rating my answer!

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1 Answer

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