[Kind of SOLVED] Weird AT Shifting Problem

noises
transmissions
clutches

#1

Hi,

My car is 1990 BMW E34 M20B20 that uses 4HP22 transmission and here is the problem:

When I put it from P into R it makes a sound like a hitting and doesn’t move but you can understand it is on load, because when I step on the gas, engine cannot outrun 2000 rpm (even at trying to rev).

When I shift into N, it starts to move forward and it’s drivable but not an engaged drive, and while traveling or not, when I shift from N into D, it retrieves the engaged drive and goes normal.

I think it cannot leave 1st gear or all forward clutches.

What the problem could be?

Sorry for my English,
And thanks for help all given in advance.


#2

How many miles?


#3

300K kilometers. :slight_smile: around 185K miles I think.

Its ATF was changed with Dexron 3 and made dry fill, and also filter changed about 10K km ago.


#4

This guy found a dirty screen and it fixed his problems , which sound exactly like your problem. He even has pics of the screen filter.


#5

So, let me get this straight, I am gonna take down epc solenoid and shift solenoids, and I am gonna either replace or clean them.

Am I right? :slight_smile:

Mine can shift 1-2 (bumpy though), 2-3 and 3-4. It seems it is in first gear (or any forward clutch) even if it can shift truly into P R or N (it is my hypothesis :neutral: ) Changing solenoids might not be a solution I think.

I have read the conversation and I might have missed some part because of my unsatisfactory English.


#6

http://www.1addicts.com/forums/showthread.php?t=790499

Could be an linkage issue for me too?


#7

Any ideas fellas?


#8

I disattached the battery cables and after a few hours I attached them and I don’t know the reason why I did that, after I shift into all of gears, it got well, but it might be coincidence I think.

I hope it won’t repeat again.