n52 compression test issue

pepsih · 02-15-2013, 01:01 PM

Today, my brother did a compression test on his E90 325i EU version.
so here are the results.

CYLINDER 1: 15bar(around 220lbs) spark plug clean
CYLINDER 2: 14bar(around 209lbs) spark plug dirty
CYLINDER 3: 15bar(around 220lbs) spark plug little smoked
CYLIDNER 4: 15bar(around 220lbs) spark plug clean
CYLIDNER 5: 14.3bar (around 210 lbs) spark plug clean
CYLIDNER 6: 15bar(around 220lbs) spark plug clean

What should be the correct pressure on the cylinders?
( the engine was preheat before the mesurements)

Cylinder 2

Cylinder 3

Cylinder 5

/

e90pilot · 02-15-2013, 06:42 PM

I'm not sure what it should be exactly but that looks good. How many miles?

pepsih · 02-15-2013, 08:29 PM

the car has around 67k miles (107k km)
the problem actually is that he has to add a quart of oil every 400-500 miles!

e90pilot · 02-15-2013, 09:17 PM

Either a leak or valve guide. That's a quite a lot of oil!

pepsih · 02-15-2013, 09:24 PM

Definitely not a leak.
The car is going to the shop probably on sunday.
we'll see

GMWNashville · 02-16-2013, 09:15 AM

Your sure its not a leak? I've never had an oil consumption issue on an n52...ever...even ones will over double those miles.

smellthebeans · 02-22-2013, 05:10 PM

thats quite a bit indeed! He should be seeing plenty of blue smoke if its the valves or blow by.

Could it be a faulty head gasket (doubtful based on the pressure test results).

It could also be a faulty oil water separator this was pretty common with the M54 engine.

GoRomeo · 02-22-2013, 05:18 PM

dang that looks bad no matter what it is... I recently changed my plugs at 100k miles and did not look nearly as that... Keep us posted.

andas · 03-12-2018, 08:04 AM

Quote:

Originally Posted by pepsih

Definitely not a leak.
The car is going to the shop probably on sunday.
we'll see

What was the issue?

02-15-2013, 01:01 PM	#1
pepsih Captain 129 Rep 820 Posts Drives: f02, e24 Join Date: Oct 2011 Location: Long Island iTrader: (4)	n52 compression test issue Today, my brother did a compression test on his E90 325i EU version. so here are the results. CYLINDER 1: 15bar(around 220lbs) spark plug clean CYLINDER 2: 14bar(around 209lbs) spark plug dirty CYLINDER 3: 15bar(around 220lbs) spark plug little smoked CYLIDNER 4: 15bar(around 220lbs) spark plug clean CYLIDNER 5: 14.3bar (around 210 lbs) spark plug clean CYLIDNER 6: 15bar(around 220lbs) spark plug clean What should be the correct pressure on the cylinders? ( the engine was preheat before the mesurements) Cylinder 2 Cylinder 3 Cylinder 5 /
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02-15-2013, 06:42 PM	#2
e90pilot Freight Dawg 102 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	I'm not sure what it should be exactly but that looks good. How many miles? __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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02-15-2013, 08:29 PM	#3
pepsih Captain 129 Rep 820 Posts Drives: f02, e24 Join Date: Oct 2011 Location: Long Island iTrader: (4)	the car has around 67k miles (107k km) the problem actually is that he has to add a quart of oil every 400-500 miles!
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02-15-2013, 09:17 PM	#4
e90pilot Freight Dawg 102 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	Either a leak or valve guide. That's a quite a lot of oil! __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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02-15-2013, 09:24 PM	#5
pepsih Captain 129 Rep 820 Posts Drives: f02, e24 Join Date: Oct 2011 Location: Long Island iTrader: (4)	Definitely not a leak. The car is going to the shop probably on sunday. we'll see
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02-16-2013, 09:15 AM	#6
GMWNashville Colonel 172 Rep 2,373 Posts Drives: 19 G05, 16 F80, 10 E70x5D Join Date: Jan 2008 Location: Nashville, TN iTrader: (2)	Your sure its not a leak? I've never had an oil consumption issue on an n52...ever...even ones will over double those miles.
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02-22-2013, 05:10 PM	#7
smellthebeans Lieutenant Colonel 87 Rep 1,555 Posts Drives: LPCs Join Date: Dec 2006 Location: San Antonio iTrader: (2) Garage List 1990 325i [0.00]	thats quite a bit indeed! He should be seeing plenty of blue smoke if its the valves or blow by. Could it be a faulty head gasket (doubtful based on the pressure test results). It could also be a faulty oil water separator this was pretty common with the M54 engine. __________________
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02-22-2013, 05:18 PM	#8
GoRomeo Brigadier General 950 Rep 3,832 Posts Drives: 330i, 135i Join Date: Feb 2006 Location: San Diego CA iTrader: (0) Garage List 2008 BMW 135i [9.50] 2006 330i [6.75]	dang that looks bad no matter what it is... I recently changed my plugs at 100k miles and did not look nearly as that... Keep us posted.
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