USATransdoctor.com
These recommendations do
not cover all possibilities. They are some things
to check before you
have your transmission rebuilt. Always check transmission fluid level first.
Always run a scanner on any computer controlled transmission. On modulated
transmissions make sure they have enough vacuum.
BMW
FIND THE MAKE OF YOUR
VEHICLE
CLICK ON THE YEAR OF YOUR
VEHICLE
| ALL MODELS | 1980-83 ALL ENGINES ZF3HP22 | |
| ALL EXCEPT BELOW | 1984-94 ALL ENGINES ZF4HP22 | |
| 318I | 1992-98 1.8 / 1.9L 4L30E | |
| 320I | 1993-94 3.0L ZF5HP18 | |
| 323I | 1997-99 2.5L 4L3OE | |
| 325I | 1992-95 2.5L 4L30E | |
| 328I | 1996-98 2.8L 4L30E | |
| 525I | 1991-95 ALL Engines 4L30E | |
| 528I | 1996-98 ALL ENGINES 4L30E | |
| 530I | 1993-95 3.0L ZF5HP18 | |
| 540I | 1991-95 4.0 / 4.4L ZF5HP30 | 1996-01 4.4L ZF5HP24 |
| 740/840 | 1992-96 4.0 / 4.4L ZF5HP30 | 1996-98 4.4L ZF5HP24 |
| 750/850 | 1988-94 5.0L ZF4HP24 | 1995-98 5.4L ZF5HP30 |
| M3 | 1995-98 3.0 / 3.2L ZF5HP18 | |
| Z3 ROADSTER | 1996-00 1.9 / 2.8L 4L3OE |
Z4HP22 /
Z4HP24
The transmissions above are rear wheel drive 4
speed automatics and shift timing is computer controlled.
If your transmission starts shifting erratic, make sure you have a shop run a scanner on the
vehicle. Also check the throttle or kick down cable adjustment.
Also make sure your clutch fan on the front of the motor is not starting to
seize up. This causes the engine to sound unusually loud almost like the
transmission is not shifting into 4th gear.
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4L30E
The
transmission above is a rear wheel drive 4 speed automatic, that is all computer
controlled. It uses a microcomputer to judge operating conditions while
monitoring the throttle position sensor and vehicle speed sensor and many
others.
Common symptoms
are transmission starts shifting erratic, slipping or not shifting at all.
external sensors on the vehicle like the winter mode switch, throttle position
sensor and vehicle speed sensor, quite often go bad causing these symptoms.
Always run a scanner first to
see if a sensor is causing your problem.
I recommend that you change the transmission fluid on this style transmission
about every 12,000 to 15,000 miles.
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ZF5HP18
/ ZF5HP24 / ZF5HP30
The
transmissions above are 5 speed rear wheel drive. they can be
extremely
expensive.
These transmissions are all computer controlled. If your transmission starts
shifting erratic or not at all,
then make sure you or a shop run a
scanner on
the vehicle.
You want to see if you have a sensor that has gone bad,
causing your problems.
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Z3HP22
The
transmission above is a 3 speed automatic and shift timing is controlled by a
throttle pressure cable that connects from the transmission to the carburetor or
throttle body.
Always check this cable first. They can cause erratic shifts and or no shifting at all. Also check the clutch fan that is located at the front of the engine. Sometimes they seize up, this causes the engine to sound unusually loud almost like the transmission is not shifting into 3rd gear.
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