How To Compression Test Your Engine [2023]
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- Опубликовано: 12 сен 2024
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Is your car burning or consumption oil? Does it smoke or have low power under acceleration? I suggest you do a compression test to check the health of the engine. If you have low compression on one of the cylinder, it can cause the exhaust to smoke and have low power. In our case, I was checking for oil consumption. Take a look at the spark plugs, if they are all clean, most likely the engine is not burning oil. Otherwise, if one spark plug is black and covered with carbon build-up, that is the cylinder that has the problem.
My Story: I bought a lemon BMW 325i E90 with the N52 engine that burned so much oil, it could have been a fish in a previous life. After diving in and researching how to fix the oil consumption issues [check video playlist below] I started by changing the Crankcase Ventilation Valve (CCV) which did not help our oil burning issue. So now we check the compression to see if the engine is healthy.
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Valvetronic technology was introduced by BMW on 2004 with their N52 engine, so that basically means you can apply this method on all BMW till 2004 year of production on naturally aspirated engines like M62B44, M52B28TU, M54B30, and so on
Nice bro 💪🏽. Thanks for the info! 🙏🏽
N52 compression test requires using an allen key onto the valvetronic motor in order to turn the eccentric shaft to a closed degree so that all cylinders are in a sealed position, otherwise you ll get false readings.
Are the instructions for that process printed somewhere in a service manual? Can you send it to me?
@@buildanddrive it's in this fucking program ISTA+
@@buildanddriveyes it s in ISTA+.
The procedure is very easy.
Plug your scanner, display the eccentric shaft angle. Normally engine off, it s 58 or 68 degrees. Unplug the eccentric shaft actuator motor socket, and with an allen key turn the actuator until your scanner display 176 degrees. Then you can start testing compression.
Unplug the injectors harness. Remove the sparg plugs and coils as you did and test compression by the firing order 153624.
Your compression tool hose must have a shredded valve. Other wise it will loose pressure at each crank.
Scanners like INPA, ISTA, Protool, BimmerLink, DeepObd can display the E-shaft angle.
Triumph - Never Surrender
I bought the same compression tester. I was so mad when I opened it up and the different valve sizes weren’t actually marked on the box so I looked at the directions and it had everything labeled so I labeled them my self with a marker next to their spots in the box lol. I was so irritated. 😂🤷🏻♂️🤦🏻♂️
Lol.
Why are you compression testing your car?
The gauge are crasy jumping 😮
Yes, this engine could drive fine but was not healthy
your vids are so helpful thanks for your efforts!! I have an x5 E70 with the N52 engine where can I find the service manuals to download or print out? thanks!
Go to newtis.info and click on the login icon in the top right side. You can then create and account.
Did you find out the right way to do the test? Can u explain how?
The guy did not message back and I didn't see anything listed in the manual... So I assume this is correct method until someone else messages here on RUclips and tells us otherwise
This is perfect
I made a few mistakes but learned how to do it after so you guys don't have to struggle like I did. I would also put a battery charger on the battery to prevent it from going flat 👌🏼
@@buildanddrive thats a good idea. Putting the battery on a charger is something I didnt think about
I have low compression on n52b25, aprox 85 psi on each cyllinder, it consume 1l/1500 km. How could it even running and how long it will last my engine ?
That doesn't sound right. Are you sure you compression tested the engine correctly? Does the car have trouble starting when cold? Follow these instructions, make sure ALL spark plugs are removed when cranking. Test it without and then add a little bit of oil to the cylinders and compare the values. If the same... Do a leak down test to check. ruclips.net/video/v0gH8dFyWH8/видео.html
@@buildanddrive I followed your steps from the beginning, I removed all spark plugs, I set the valvetronic to 176 degrees, I did an wet test and the results are a little bit higher, around 105 psi except cyllinder 3 which was still on 80 psi... My car is starting without struggling, only problem is that I have rough idle few seconds, after I cleaned spark plugs, that tough idle disappeared, another thing is that I have cats error on almost every time , is during a little bit after I clean error code to reappear again.Is strange even for me , because I can run pretty fast, the engine revs at the max RPM without struggling, I go even with 200 km/h on highway.
Could be possible to be a timing chain problem, valvetronic or a headgasket?I really don't understand, for this compression my car should smoke oil on exhaust like a diesel but mine doesnt smoke ...
P.S. I used exact the same Compression tester like yours.
@@buildanddrive Today I changed the oil with Valvoline Maxlife 5w30 and I used some flush from Liqui Moly to clean the engine maybe piston rings were stuck with carbon , but nothing has changed, the compression is the same like yesterday.
Thanks for clear videos. I'm buying used N52 , i chacked 4 used engines in and out of cars. wondering why all the 4 engines 4 or 5 cylinders had 30-40PSI compression but 1-2 cylinders 160-170PSI. i tried to turn the Valvetronic by hand and the result was still the same. 3 engines no oil but one with oil. still, i cannot understand was this broken engine or related to valvetronics or Vanos? any idea please?
Is it the n52b25? I noticed when my engine was almost dead that the oil was burning so fast that the digital oil guage could not keep up. That's when the oil would run out and blow a cylinder
@@buildanddrive yes, 52b25. you mean 4 engine from salvage yard all are blown? even all the 4 sellers are talking the engines are fine and they give me 6 months warranty?! ( no labor)
I'm not sure when all of the would have that low compression.
In N52b25 bank 2 cylinders always die prematurely because of excessive oil consumption
para hacer la prueba de compresión el motor debe de estar frío o caliente?
Both. But accurate results are during a hot engine (oil temp >= 80C)
Do both and see what's the difference.
Man. Get yourself ISTA.
The procedure of testing compression in a valvetronic engine is different.
You need an allen key! Turn the eccentric camshaft motor (VVL motor) untill valves are closed then you can start your compression test.
Without Doing this, your compression test is incorrect and useless.
After 100.000 Kms or a little bit earlier, N52 and N52k piston oil rings get clogged with carbon especially if the engine has been running lean for a while or suffered from overheating once.
BMW was aware of that problem but only released the fix at a very late date.
The updated version of pistons and rings fixes the oil consumption issue.
However I have seen some N52s reaching 300k Kms with no oil consumption whatsoever.
Do you have a tutorial or repair manual instructions I can follow? I have ista and can try it out.
@@buildanddrive Sorry this reply is so late, I'm finally getting round to my rebuild and found this video detailing the valvetronic issue when checking compression. ruclips.net/video/Hb7M9rMzU5E/видео.html
@@mdavisyates thanks for sending this. I didn't adjust the valvtronice motor and still got the same results.
Does 08 e60 n52 have the update ?
@@robertgreatsinger9179 yes for any n52b25 made before june 2010