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bucking at 1/2 a tank

 
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Old 31 Aug 2010, 12:01 pm
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Default bucking at 1/2 a tank

I have a plain 2005, shift. A couple of weeks ago my engine light came on and the car started bucking when the gas level was down to 1/2 a tank. Put in some high octane fuel and the light went off and it ran fine until I reached the 1/2 mark again. Same bucking started again. So put in some more high octane and a "can" of HEAT. All was fine until once again I got to half a tank. Light came on and the bucking started again. I'm a little old lady with no mechanical know-how and would like some suggestions before I take it in so I don't get sold a bill of goods. Thanks!
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Old 31 Aug 2010, 01:04 pm
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Default Re: bucking at 1/2 a tank

Welcome to the forum.

When the engine light came on that means one of the sensors saw a fault and sent a signal to the computer. The computer stores that fault code until such time when it's erased from memory. In order for us to help you we need to know what that fault code is. Here's a link to help you retrieve that code. Read it, and come back to tell us what you found on this same thread of the forum.

Just to be clear, sometime the fault code just tells a general direction of the fault and you'll still need a mechanic to hook the car up to a scanner to pinpoint a problem.

How to retrieve fault codes.
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Old 31 Aug 2010, 01:54 pm
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Default Re: bucking at 1/2 a tank

Thanks for your quick reply! The code that comes up is P0340
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Old 31 Aug 2010, 02:43 pm
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Default Re: bucking at 1/2 a tank

That code suggests a fault with your camshaft position sensor. This sensor could definately cause a "bucking" sensation or other disturbance while driving. However, it has nothing to do with the fuel level and may just be coincidental that it's happening at half a tank each time.
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Old 01 Sep 2010, 07:50 am
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Default Re: bucking at 1/2 a tank

And stop putting premium fuel in -
Premium fuel is actually harder to ignite - it is needed in most turbo and high-compression engines only.
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