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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > 2007 N51 leaky VCG?



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      02-01-2015, 11:04 PM   #1
e90_Nick
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2007 N51 leaky VCG?

I suspected a leaky gasket so I took off the engine cover and found the culprit (I believe). My car has been throwing the P0171, P0174, and P1415. Here's some pictures of the engine.http://imgur.com/a/mdevn
what do you guys think the issue is?
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      02-01-2015, 11:40 PM   #2
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Originally Posted by e90_Nick View Post
I suspected a leaky gasket so I took off the engine cover and found the culprit (I believe). My car has been throwing the P0171, P0174, and P1415. Here's some pictures of the engine.http://imgur.com/a/mdevn
what do you guys think the issue is?
Looks like you need a new oil cap w/gasket and the oil filter housing gasket changed. I had similar oil leaks and that's what they were. Oil is leaking from your oil cap and filling the coil valley, which will then run down the valve cover when cornering to the left. Oil filter housing is pretty common on here. Both are easy to change.
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      02-02-2015, 02:05 AM   #3
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Quote:
Originally Posted by rhombus View Post
Looks like you need a new oil cap w/gasket and the oil filter housing gasket changed. I had similar oil leaks and that's what they were. Oil is leaking from your oil cap and filling the coil valley, which will then run down the valve cover when cornering to the left. Oil filter housing is pretty common on here. Both are easy to change.
Thanks for the tip, would these throw these codes and cause a SES light?
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      02-02-2015, 07:00 AM   #4
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P0171 & P0147 are both o2 sensor codes and P1415 is secondary air pump. You need to take care of the oil leaks for obvious reasons but both P0171 & P0147 are sometimes the vacuum lines. Take a look at those while your in there. It is possible that hot oil has screwed one of the vacuum lines up. You could also clean the MAF sensor but be careful as it is fragile. Check for the vacuum leak on the intake boot and ccv hose. Easy fix you shouldn't be too worried but I wouldn't keep driving it in that condition for long. Take the day off and fix/investigate your issues further.

Things you need to check:

Vacuum lines
o2 sensor's (there are 4 I believe)
MAF sensor
OFHG
VCG

Last edited by MORTON; 02-02-2015 at 07:09 AM.
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      03-11-2015, 08:10 PM   #5
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Dealer said the valve cover was cracked, along with the coils being bad. Probably going to do the valve cover myself since they want 1600$. How hard is it?

Last edited by e90_Nick; 03-11-2015 at 08:36 PM.
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      03-11-2015, 11:13 PM   #6
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I currently have a leak around my oil cap too. Did you replace the oil cap and gasket or can i just reuse the cap and purchase the new gasket. Just wondering what you did to resolve that issue. I just replaced my plugs and coils and found oil pooling around cylinder 6 which i thought was from the oil cap and not VCG since i had that replaced not too long ago.
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      03-12-2015, 12:14 AM   #7
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It could take 5-6 hours. I took my sweet time and did it over a couple of weekends.
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      03-12-2015, 11:51 AM   #8
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Quote:
Originally Posted by TechE92 View Post
I currently have a leak around my oil cap too. Did you replace the oil cap and gasket or can i just reuse the cap and purchase the new gasket. Just wondering what you did to resolve that issue. I just replaced my plugs and coils and found oil pooling around cylinder 6 which i thought was from the oil cap and not VCG since i had that replaced not too long ago.
I didn't do anything with that yet since it could just be spillage from the last oil change. I'm going to clean it and see if more oil accumulates. If I were you I would look for cracked valve cover too.
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