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  #1  
Old 02-15-2017, 07:39 PM
JoshTheBMW JoshTheBMW is offline
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2005 BMW X3 3.0i Low Compression cylinder 2 misfire

Hello!

My 2005 BMW X3 3.0i is misfiring, shaking, and barely accelerating. I brought it to the mechanic and he said that it is caused by low compression in cylinder 2 and that it can be fixed with a new engine or torn down and fixed but it would cost $3000-5000. The car mileage is over 183,000.

Quick background:
The car started to start up rough a few months back and progressively got worse until about 2 weeks ago when it started to shake real bad and became hard to drive.

What I've done so far:
I cannot pay that price to have the mechanic fix the X3 so I have taken it upon myself to do so! With the car running I disconnected coil wire from cylinder 2, no effect to engine. I disconnected the 5 other coil wires one by one, all 5 caused the engine to idle rougher when disconnected. This confirmed that it is indeed cylinder 2 causing the issue.

I currently have WD40 sprayed onto cylinder 2 to see if the rings can come loose if that is the problem. This is the second night of soaking. If it does not run smoother tomorrow, I will proceed with taking apart the engine (which I have not done before) and replace all the seals/gaskets and piston rings.

This is my first time ever taking apart an engine but I welcome the challenge. If you have any suggestions and tips that would be greatly appreciated! Any ideas on what the problem could be besides the pistons rings would be great!

Thanks! I'll touch back soon!

- Josh
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  #2  
Old 02-15-2017, 08:07 PM
BMWaufKS BMWaufKS is offline
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Are you sure its not just a bad ignition coil, etc.?
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  #3  
Old 02-15-2017, 09:13 PM
JoshTheBMW JoshTheBMW is offline
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Yes I am positive it is not an ignition coil. I moved it to different cylinders and they worked no problem. The code stayed with cylinder 2.
Thanks!
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  #4  
Old 02-16-2017, 06:24 AM
swampX3 swampX3 is offline
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ditch that cleaner/soaker and try this

>this is/was a common E46/early X3 issue .... carbon sticks rings and little to no compression .....it may be your issue ....try the AC DELCO UPPER ENGINE CLEANER X66P .....show in the link below

>follow the procedure and do not rush it....this will be your engine but in a saloon .....best wishes

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  #5  
Old 02-16-2017, 06:30 AM
swampX3 swampX3 is offline
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very good M54 engine etc rebuild series

>watch this entire series and subscribe....if all else fails with your compression issue he has a great guide to testing and overhauling your engine from a home DIY point of view

>you should complete the compression and leak down tests before tearing anything apart....do not throw dollars away unless you want to overhaul your engine for fun/experience

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Old 02-16-2017, 06:35 AM
swampX3 swampX3 is offline
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shopping link

>google around for best price ....check your local folks too

https://www.amazon.com/ACDelco-X66P-.../dp/B0013FMW84
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  #7  
Old 02-26-2017, 06:02 PM
JoshTheBMW JoshTheBMW is offline
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Hello all!

Thanks for all the tips. Over the past few days I have tried the ACDelco Upper Engine Cleaner and it has not worked. Within the next few weeks I will be working to take apart the engine and see what I have.

Thanks! I'll check back soon!
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  #8  
Old 02-26-2017, 07:35 PM
BMWaufKS BMWaufKS is offline
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If you do a full rebuild, let us know if you find an aftermarket rebuild kit (with rings, bearings, etc.). When I looked 1.5 years ago, there wasn't even a full-rebuild gasket set available.
__________________
-------------------------------------------------
Since 1/2016, restoring a
2008 BMW X3 M-Sport, N52, automatic ("#1")
Modifications:
All stock except dashcam

Since 3/2017, also restoring a
2008 BMW X3 base-model, N52, automatic ("#2")
Modifications:
Dashcam, cargo cover, cargo mat
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  #9  
Old 02-28-2017, 08:56 AM
abscate abscate is offline
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IF this is your first engine, plan on three months of weekends to work slowly and carefully. Ask lots of questions here and learn to ID the people who actually wrench on an M54 vs the pretenders. There are a lot of things you can mess up on a rebuild, Ive done most of them once. Ive never done an M54.
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  #10  
Old 11-04-2017, 07:58 AM
JoshTheBMW JoshTheBMW is offline
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Update;
You were right about it taking 3 months of weekends haha.

The engine ended up having a blown out exhaust valve in the cylinder with low compression. Did the rebuild and it runs mostly smooth but have lean codes in both banks. It is running extremely lean and based on what the mechanics said, it is what caused the blown out exhaust valve in the first place. So it seems I fixed the engine but not the actual ‘problem’. I have another threat that is focusing on troubleshooting the codes.
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  #11  
Old 05-23-2018, 10:51 AM
daisylucas daisylucas is offline
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Hi JoshTheBMW,
I'm headed in the same direction with my x5 3.0i cylinder 4. What was the fix for your lean codes?
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  #12  
Old 05-23-2018, 08:46 PM
abscate abscate is offline
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Usually vacuum leaks or bad OXS

Diagnose by watching the fuel trims at idle and 2500 rpm
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  #13  
Old 05-24-2018, 12:34 AM
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Quote:
Originally Posted by JoshTheBMW View Post
Hello all!

Thanks for all the tips. Over the past few days I have tried the ACDelco Upper Engine Cleaner and it has not worked. Within the next few weeks I will be working to take apart the engine and see what I have.

Thanks! I'll check back soon!
I know this is old but question: can this ACDelco Upper Engine Cleaner be used as preventive maintenance?
Quote:
Originally Posted by BMWaufKS View Post
If you do a full rebuild, let us know if you find an aftermarket rebuild kit (with rings, bearings, etc.). When I looked 1.5 years ago, there wasn't even a full-rebuild gasket set available.

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Old 05-24-2018, 05:00 AM
timarnold timarnold is offline
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Quote:
Originally Posted by BimmurBrothor View Post
I know this is old but question: can this ACDelco Upper Engine Cleaner be used as preventive maintenance?



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Logically, it could. While you could do damage to the catalytic converter if you do it way too often, doing a soak before the oil control rings are completely clogged with carbon would be a lot more effective.

I rebuilt my engine because of oil consumption and the oil control rings were completely clogged. Just as I trial I did a soak on one of the rings I had removed. The soak did remove a fair amount of the carbon, but it was nowhere near 100% effective.
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Old 05-24-2018, 05:33 AM
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Should I soak all cylinders at once and should this soak last like over night?

05 X3 181k
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Old 05-24-2018, 06:36 AM
swampX3 swampX3 is offline
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be prepared to smoke the neighbors

>also ....good to be guided by a simple compression test first ....so ....good compression = little or no need to soak and smoke

>some of the soak fluid and some of the tar/asphalt/coke it relases will end up in the sump ....so .....if poss try and do it just before oil change.....or .....simply invest in an oil and filter change after the soak

>we've soaked all at once but then we've smoked the workshop and neighborhood after startup ....so ....might wanna start with a couple of cylinders
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  #17  
Old 05-27-2018, 01:30 AM
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Very good heads up and insight!
Thanks

05 X3 181k
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2005 x3, cylinder 2, e83, engine repair, misfire, misfiring, piston, piston rings, x3


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