Question about BMW 750

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My 2004 745i sputters around 40 mph. Is is trying to shift into overdrive? Computer problem or transmission problem?

Posted by mkelly620 on

  • mkelly620 Aug 11, 2008

    If it is a transmission problem, how serious?

  • mkelly620 Aug 11, 2008

    If it is a transmission problem, how serious?

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3 Answers

LORETO LACARON

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Its not that serious. you just need to take it to a repair or dealer. They will calibrate the transmission.

Posted on Aug 11, 2008

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It is issue with the transmission ....

Posted on Aug 11, 2008

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1 Answer

Transmission shifts hard


You don't give me much information to work with. However, 1st, look at the engine mounts. You may have a broken mount. This will make it feel like the transmission is shifting hard. Other than that, there is only a few things that will cause this. The speed sensor tells the computer when to shift the shift solenoids. It may not be "seeing" a quality signal. If this is the case, the speedometer will be bouncing too. Last idea is that it is skipping a gear. Starts in 1st, should go to 2nd at about 10 MPH. 3rd at 25 to 30 MPH. And, if you have a Overdrive transmission, it should go into overdrive at around 45 to 55 MPH. If it is skipping 2nd, it will engage 3rd at a high engine speed, and will feel like a sudden slam into gear. If this is true, your transmission needs some work. Hope this all helps. Good Luck.

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Mai

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Rpms rev up and down around 40 mph


Shifting in and out of overdrive ?

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Car bucks between 40 and 50 mph


Year make and model ?
If the engine has a minor performance problem, it will be magnified when the transmission shifts into overdrive around 45 mph.

Aug 03, 2012 | Cars & Trucks

1 Answer

Just had my 475 transmission rebuilt. Only ***** at 20 mph and 35mph. Shouldn't there be a third gear change at 45mph?


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Jul 02, 2012 | Cars & Trucks

1 Answer

Transmission over drive is causing the transmission to slip. When I take off the overdrive the transmission functions normally but it uses much more gas.


Roger, that doesn't even make a whole lot of sense to me. If the overdrive is causing the transmission to slip, wouldn't it also cause the fuel mileage to go down? Are you sure the transmission is slipping? Or is the transmission simply shifting in and out of overdrive? If it is, is it shifting at the proper speeds? Driving at around 40 - 50 Mph will sometimes make the transmission go in and out of overdrive repeatedly. This can be perfectly normal.

Have you checked your transmission fluid level?

Is your overdrive off light flashing? If the transmission is actually slipping the OD OFF light should be blinking at you to let you know there is a transmission problem. Either that, or the Check Engine light will be coming on. In either of these cases, you need to scan your onboard computer network for possible fault codes.

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I have a 1994 1500 extended cab pickup, with I think a 350 engine. The truck will not go in overdrive, but will get up to about 40 mph in drive. It will still go in reverse and 1st and 2nd gear but not...


Before you go tearing up the transmission. Check tp sensor (throttle position sensor). Keep in mind transmissions also have electronic parts that govern shift patterns . Signals sent to the truck's computer from sensors govern when it shifts. I would check sensors and wiring to those sensors first before tinkering with a transmission.

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Shift letters for a 1992 chevy 2500. what does each mean?


The D inside of an O is for overdrive. It is an automatic overdrive transmission. There isn't an overdrive button on it. If you want to disable the overdrive you have to shift down a gear.

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the reason it might be shifting so early is because of the gear ratio in the rear end of the truck. it is common in the 2 wheel drive basic model pickup because they were designed to work not travel.

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