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E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 11-29-2012, 11:50 AM
muzeya muzeya is offline
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E36 engine change

Hi Guys
I need some help. I have a '93 E36 - 320i. The gearbox got messed up from a bad oil change & i was forced to buy a new engine & gearbox. Problem is, the engine i got was a M52B20, from the '97 E36-320i. I had the new engine installed, but the gear change is slugguish, & the car has no power. Going uphill is embarassingly slow? What did we do wrong? How can i get the power back?

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  #2  
Old 11-29-2012, 02:03 PM
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First off, how did any oil change affect your transmission?
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  #3  
Old 11-29-2012, 02:46 PM
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If you add way too much oil, it could screw up the clutch?
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  #4  
Old 11-29-2012, 03:37 PM
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Could've had the wrong fluid used. Don't know why you'd have to replace the transmission and engine, though.
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  #5  
Old 11-29-2012, 04:49 PM
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Quote:
Originally Posted by jonesin View Post
First off, how did any oil change affect your transmission?
My thoughts exactly...


Maybe...

"hey herb, check this out. It looks like Hans and Franz had a few too many Warsteiners when they were designing the engine oil system. They put the drain plug on the bottom of the transmission!"
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  #6  
Old 11-29-2012, 05:22 PM
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He probably was meaning a transmission oil (fluid) change.....


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  #7  
Old 11-29-2012, 06:10 PM
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But then what happened to the engine?
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  #8  
Old 11-29-2012, 06:28 PM
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so many questions, so little information...




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  #9  
Old 11-29-2012, 09:47 PM
muzeya muzeya is offline
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Ok. The gears wouldn't change. I could get reverse & gear 1. The rest wouldnt engage. My driveway has a slight incline so driving out frontwise was almost impossible. So i called in some 'expert' who told me the gearbox had been stuffed so i needed a new one.

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  #10  
Old 11-29-2012, 11:13 PM
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Still no reason to change the engine.......

Have you actually done the work yet, or are you asking IF it needs to be done? Try being a bit clearer. We are trying to help, but you've given us almost nothing to work with.
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  #11  
Old 11-29-2012, 11:57 PM
muzeya muzeya is offline
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I have already done the work. The dealer only imports complete engine /gearbox kits so thats how i ended up with another engine yet all i needed was a gearbox. At first, the new engine refused to start. After consulting, i realised the engine type uses a coded ignition/ key system which did not come with the engine kit. So we removed the manifold & injector/nozzle assembly that came with the new engine & used the one from the old M50 engine. Thats how i got the car to start. She moves, but has no power. Is that helpful?

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  #12  
Old 11-30-2012, 04:29 AM
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manual trnsmission?? if so, did you check the clutch for slippage??


as for the ews, that's got nothing to do with the manifold or other parts on the engine. it's all through the dme, which is coded to the chassis. the engine does not care what vehicle it is in.

my guss is that something was not connected properly with the old manifold (was it an m50 as well??) that got corrected wen the additional work was done.

again, if all you needed was a gearbox, why not seperate that from the motor and resell the motor??

because if it is related to the clutch, you're going to have to do this all over again to getthe clutch repaired.

sounds like a lot of extra work for you, sorry to say.





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  #13  
Old 11-30-2012, 04:58 AM
muzeya muzeya is offline
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Its automatic. The mechanic support here is not yet upto the BMW hitech standard so some operations the local guys cannot be trusted to do very well. I decided not to seperate the new kit for just that reason. I was afraid they would make a big mistake, thats why i just removed the old M50 engine & put in the new M52. I want it to work, just dont know what else to do.

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  #14  
Old 11-30-2012, 07:14 AM
granlund granlund is offline
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You should be able to use the M50B20 intake, ignition and fuel rail on an M52B20 without any problems. How does the engine sound when revved high in neutral? Any stuttering?

You mention that the gear change is sluggish. I wonder if the new automatic transmission uses the same valvebody control program as the old one.

Last edited by granlund; 11-30-2012 at 07:16 AM.
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  #15  
Old 11-30-2012, 07:42 AM
muzeya muzeya is offline
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I think you may have solved my problem. The old intake seems to work on the new engine, though fuel consumption is rather high. The engine sounds like normal, growls like a Beemer should, but that spine racking thrust is not there! Push the accelerator & the engine howls but no corresponding power thrust. I have suspected there maybe something thats not connected properly, but as you know mechanics dont like being second guessed by ignorant car owners. Can you explore further this" valvebody control program as the old one."?



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  #16  
Old 11-30-2012, 08:24 AM
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Quote:
Originally Posted by muzeya View Post
I think you may have solved my problem. The old intake seems to work on the new engine, though fuel consumption is rather high. The engine sounds like normal, growls like a Beemer should, but that spine racking thrust is not there! Push the accelerator & the engine howls but no corresponding power thrust. I have suspected there maybe something thats not connected properly, but as you know mechanics dont like being second guessed by ignorant car owners. Can you explore further this" valvebody control program as the old one."?



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  #17  
Old 11-30-2012, 08:36 AM
granlund granlund is offline
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If the engine sounds normal and the check engine light is not on, we should be able to leave the possibility of the engine being at fault for now. I'm thinking that your hydraulic line pressure might be low, or you're low on fluid since the transmission shifts sluggish. The line pressure should be electronically controlled, but the question is if the new transmission has the same control voltage/pressure as the old one.

Is the new transmission the same model as the old one?

Are you sure it has the correct amount of fluid?
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  #18  
Old 11-30-2012, 08:49 AM
muzeya muzeya is offline
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I think the transmission fluid is ok. Its been re-done twice now, the only thing i worry about is whether the work was done properly, as i told you, Beemer service is very bad where i am at the moment. The two engines are very different, so it must follow that the gearbox is different too. The original was '93,M50 automatic. The new one is '97 M52 automatic. Its more advanced than what i had before so i think you could be right about the fluid pressure regulation being the culprit. What is the control voltage pressure? I believe the sluggishness might be due to that.

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  #19  
Old 11-30-2012, 09:21 AM
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What parts of the electrical system were swapped over with the engine and transmission? You had an OBD-1 system, but I believe the '97 is an OBD-2, even for non-USA engines. If the engine didn't come with the correct computer, you'll never get it work right as-is. An OBD-1 car can be cross-bred with an OBD-2 engine, but it's a LOT of work. I think you'd need the transmission computer in addition to the ECU. That is probably the answer to your sluggish performance.
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  #20  
Old 11-30-2012, 09:38 AM
granlund granlund is offline
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Europe (and most likely Africa) did not have OBD-2 until the E46, but the mechanical part of the engine, even the VANOS solenoid, is not too different. You should be able to run a long block M52B20 with M50tuB25 ECU without any problem. The -95 525 e34 actually had an M52B25 with the same OBD-1 electronics as the 93-94 using the M50tuB25.

One electronic difference is the crank sensor that is mounted in the block of an M52 and on the front of an M50. However, if it's incorrectly used, the engine will not even start, so that is unlikely to be the problem here.

Control voltage/pressure means that the transmission computer sends out a voltage signal to a solenoid(valve) in the transmission to change the hydraulic pressure. If it is (slightly) higher than manufacturer normal, you get the transmission to shift faster. If lower, the shifting is slowed down and smoother. If too low, the clutches can't lock and you will have slippage, very poor performance, wear out the clutch faces and have to rebuild the transmission. One way to diagnose a transmission that is doing this is to drop some transmission fluid on a white tissue and smell it. It should be clear red (not brown) and not smell burnt.

Can the auto shop measure line pressure and verify against what it should be? (I don't have the correct information)

Last edited by granlund; 11-30-2012 at 09:48 AM.
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  #21  
Old 11-30-2012, 10:00 AM
muzeya muzeya is offline
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No electronics were swapped. The only modification i did was to use the old intake manifold with the new engine. I never got the computer that runs this new engine. We just connected the old computer. I think thats where the problem is. Thanx so much for the info. I will contact the dealer to find out if he can get the computer for me.

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  #22  
Old 11-30-2012, 10:24 AM
granlund granlund is offline
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No, you don't need the new engine computer. Apparently, all years of the M50/M52 used the same A5S310Z automatic transmission outside US and Japan, so that computer should work as well.

Check the transmission fluid first before doing anything else.
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Old 11-30-2012, 10:50 AM
muzeya muzeya is offline
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You have been a great help. First i will have the transmission fluid lines checked thoroughly. Next acertain pressure. If no change then i will change the gearbox computer.

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  #24  
Old 11-30-2012, 04:56 PM
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ok, so it' an automatic transmission....which is not (usually) associated with the term 'gearbox'. that's usually associated with manual transmissions....


you may be low on fluid, so i would check this out for proper fluid check.






i would do this first before you start with anything else.

this assumes that all of the plugs and such have been plugged back in.




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  #25  
Old 12-01-2012, 12:09 AM
muzeya muzeya is offline
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Yes its an automatic transmisson. Forgive the terminology mix up. I am addicted to the dolphin & i cant think of myself driving anything else. Thanx again for your help.

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