Question about 1999 BMW Z3

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When shifting gears on 2.5 Z3 the rpm does not drop off fast enough. The car is 1999 with 109k kilometers

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  • Anonymous Mar 24, 2014

    automatic transimission

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  • BMW Master
  • 22,114 Answers

This could be the sensor on the other side of the butterfly ,again electronics? difficult to advise correctly and owing to the fact that iam english so we no doubt call it the proper name and the american name is a slang derivative derived from a drubbing of the english language

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

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1 Answer

Why wont my isuzu rodeo stay in gear


there are only 3 issues here.
1 weak engine, , even 1st gear I have no engine power.
2: 1st revs normal but wont shift up.
3: the transmission slips. (flares) RPM goes nuts.

which one?

Jul 14, 2014 | 2001 Isuzu Rodeo

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Switching gears from 1st to 2nd


there is a computer that controls your rpm gauge, your speedo, and your shift. check that and your speed sensor. the sensor is faster and easier.

Jul 26, 2009 | 2004 Nissan Maxima

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How to fixcode755 solenoid B


755 (why drop the prefix?????) makes his 10x harder.

the FSM covers this , buy one or look online at alldata.com

P0755

the P0 COUNTS ! p means power-train, the 0 means federal std. code.



lets to TCM 101:

the TCM shifts this tranny,.

the TCM sends 12vdc to the solenoid to do SHIFTS.

the TCM checks the voltage at time of this command.

the voltage reads wrong, the TCM is not HAL2000, its just brick stupid

it only knows the test it did fail, and NEVER why

enter the technician and his FSM book and the steps to find it





the TCM can see solenoid faults 2 ways (at least)

voltage read back at the solenoid (the fsm is clear on this ,read it)



or RPM drop fail. VSS fails to drop or rise pre shift command.

each time the TCM shifts this tranny it looks at the TAIL RPM

and if wrong sets codes.

the FSM actual explains this. best.



now see actual FSM

Actual gear ratio and the Required gear ratio did not match during the CCM Rationality test.

see , unlike my first link (bad net bs)

the TCM does RATIONALITY tests.

that means it shifts and then looks at tail shaft RPM (VSS)

and sees rpm wrong. (tables of valid rpm in TCM)

at an up shift the RPM drop is checked. carefully. by the TCM.



and possible list. quite different.



  • * A/T component problems (i.e., in clutch, brake or gears)


  • * SSB is damaged, stuck "open" or stuck "closed"


  • * Transmission valve body is clogged, dirty or stuck




in barstool lingo.

tranny slips in any gear. related to B solenoid.

by valve body, that includes the actual valve B sticking or dirty or clogged.



make sure the transmission ground strap is no missing or bad.

this IS MY FIRST CHECK on all A/T cars...

the transmission must be 100% perfectly grounded at all times.

or it WILL fail. (TCM fails()

Feb 11, 2014 | Toyota Cars & Trucks

1 Answer

Transmission


Sounds like this car was submerged in water sometime in its life.

What is your specific question ?

May 04, 2017 | 1997 Audi A6

1 Answer

Delay in Auto shifting from 2nd to 3rd gear


Check your ignition coils. One of mine was bad and when I replaced it, the shifting issue stopped.

Apr 22, 2013 | 1997 Nissan Maxima

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Golf 2004, 1400 CC , Car keeps turning off.


shonds like an electrical short caused by clutch engagement check wires going to you engagement switch at clutch or by you gear shift housing

Jul 04, 2012 | Cars & Trucks

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When i shifting fourth gear to fifth gear then after 1-2 kilometer journey fifth gear automatically shifted to neutral, kindly suggest what is the proble and its solution in terms of price wise


This is caused by some kind of electronic shift fault in the transmission electronic control system, it shifts to neutral to avoid further damage to the transmission. You must have the dealer look at this and use a live data scanner.

Jun 01, 2012 | Cars & Trucks

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