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X3 E83 (2004 - 2010)
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  #1  
Old 09-13-2016, 04:02 PM
TomNJ TomNJ is offline
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Compression Test DIY for BMW X3 E83 3.0 M54

Okay, I don't have the answer but I didn't find a page searching for the X3 so I thought maybe I'd ask and next person who searches for this could benefit from the answers. I know there are other similar models with instructions but always nice to find exactly what you're looking for.

What is the best way to do a compression test on a BMW X3 E83 with M54 engine?

Do you remove any fuses and relays? If so which ones and why? Saw someone somewhere recommend disconnecting DME.

Do you floor the gas pedal?

Do you open the throttle? (or remove DISA valve?)

Do you remove all the spark plugs first or do them one at a time.
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  #2  
Old 09-13-2016, 04:50 PM
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acoste acoste is offline
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"Do you remove any fuses and relays? If so which ones and why? Saw someone somewhere recommend disconnecting DME."
Fuel pump fuse - so it won't inject any fuel in there, also saving battery power
DME fuse or relay - so it's not gonna stress the coils, that could generate high voltage with no spark plugs in there

"Do you floor the gas pedal?"
since DME is disconnected, it makes no difference

"Do you open the throttle? (or remove DISA valve?)"
not needed, all the valves are closed at the compression peak that you measure, so it's irrelevant

"Do you remove all the spark plugs first or do them one at a time."
Remove all. otherwise you give the starter and battery a hard time
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Last edited by acoste; 09-13-2016 at 04:54 PM.
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Old 09-14-2016, 12:42 PM
TomNJ TomNJ is offline
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Thanks. I'll update the thread with some pictures and your answers and any other that may follow.

On the E83 fuel pump is fuse 54

Is the DME 29 and 30? It's labelled as "Engine Control" Would removing those 3 be enough? It's easier to remove a fuse than a relay.
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Old 09-14-2016, 03:22 PM
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acoste acoste is offline
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F54 is the fuel pump, correct.

As for the DME the best approach is to remove the relay.
The reason for that is the immobilizer. If you remove the main power (fuse) from the DME, it will not be able to cooperate with the immobilizer (EWS) so the EWS will not send the enable signal to the starter.
By pulling the DME relay all the engine sensors, solenoids, injectors lose power except the DME itself.



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Old 09-20-2016, 07:07 PM
swampX3 swampX3 is online now
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M54 and generic compression test link

some good stuff in this link on compression testing

hot or cold

have the throttle OPEN

kill the fuel and or spark

little bit of oil to seal the rings

get a tester with a valve as shown in the video to minimize faulty readings ....best wishes

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