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2001 bmw 750il ****** shifts good when first starts then in about 20mins revs high from 1st to2nd does that for about 20mins then shifts fine for rest of day???

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  • Cars & Trucks Master
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The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM or ECM,ECU), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems can and do cause many drive-ability related problem such as rough idle and other symptoms.

Posted on Oct 31, 2012

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Posted on Jan 02, 2017

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short shadey
  • 421 Answers

SOURCE: 1990 750il bmw

you may need to have a throttle body adaptation done at the dealership please rate -jeff

Posted on Sep 01, 2008

Molson02536
  • 3854 Answers

SOURCE: Hard Shift to 2nd Gear/next gear

Your going to have to get your car scaned for codes. Auto Zone can scan it for you for free and tell your what you'll need to fix it.
It sound's like your VSS Sensor (speed sensor) is not working and your ECM is not getting the signal from the transmission to know when to shift the gears.
Becareful not to burn out the transmission till you get it fixed. The sensor it self is not that expansive and to replace it is easy and takes about 30 min to do.
If you get a P0720 or a P0722 code, then it's your speed sensor. It's an esy fix and Auto Zone can give you instrction on how to change it. 
Good luck, it takes about 30 min to change and hope this helps.

Posted on Apr 23, 2009

ourhowse
  • 2007 Answers

SOURCE: 2001 chevy blazer not shifting right

Check the oil if you haven't already. If that makes no difference, change the tranny oil and filter. It can make a world of difference. Another thing it could be is your fuel filter. The engine is starving for gas, and can't shift properly.

Posted on May 20, 2009

bonedivers
  • 1140 Answers

SOURCE: my 98 cvhevy blazer wont go into reverse,an it has

Super common problem with these units. Broken sun shell. Depending on where you are can be expensive. I fix this all the time for $950.00

Posted on Jul 21, 2009

  • 12 Answers

SOURCE: car will shift from 1st to 2nd. It will rev high

bad transmission

Posted on Jan 28, 2010

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