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2005 BMW 745Li

 

Question: 5th gear "hicupp"

Question

Visitor, Jacksonville, FL, December 30, 2010, 17:43

Only in 5th gear, my car(57000 miles) hesitates(hicupps)before it changes into 6th gear. it runs fine. i was told that it was the higher level of ethanol in the gas(dealership by phone). I was told to use Chevron mid-range gas and premium and it appeared to help but it still does it. I had the fuel filter changed thinking i may have some water but it showed some water that was trapped in the filter. No engine code is showing up and fluid is clean and fine. Please help, money is tight and i don't trust but 1-mechanic and he's good but not fluent with this type of problem. 12-30-10. newlevelcc@yahoo.com

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  • Answer #1

    torque wrench from Stewart's Auto Repair LLC, December 30, 2010, 19:14
     Master

    It sounds like you are experiancing torque convertor shutter. happens when transmission shifts to overdrive gears. Check your transmission fluid, should be a red color and no burnt smell. Check it when in park on a level surface when it reaches normal operating temp. should be up to full level.

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    Visitor, December 31, 2010, 03:54

    Thank you! My mechanic already checked the fluid level and it was fine. How much does a converter cost and where is it located? also at times when it shifts into 6th gear it kinda "falls in" or shifts hard into 6th gear. You still think this is a converter problem? Are you talking about a front seal for the converter or changing out the whole thing?

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    Visitor, December 31, 2010, 06:31

    you did not state this further info on your original post. most likely a transmission issue and not fuel. this is a very expensive and complicated transmission; rebuilds usually are not successful. if money is tight, trade the car today.

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  • Answer #2

    Visitor, December 31, 2010, 06:26

    If it were in my shop (overby's) I would tell you premium
    fuel only and a good dose of a high quality fuel system cleaner like lubromoly jectron. If you've been using gas other than a "top tier" fuel (visit www.toptiergas.com)you may have an injector sticking intermittently. There is no detergent in many of the cheaper gasolines and you
    simply get what you pay for. If your trusted mechanic does not know this fact, you have the wrong guy. We see issues like this on a regular basis.

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    Visitor, December 31, 2010, 13:56

    I normally use premium but I only used mid-range a couple of times. It was Gainesville BMW dealership who told me about mid-range gas at Chevron. I am really flustered about how much it cost to replace a transmition with only 57000 on it. This car runs perfect in all the other gears. Thank you sir.

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