Oil leak and Vaccum Leak: Help to diagnosis?

[BavarianZHP]

Did my regular self-check-up of the car today. I arrived back from vacation to notice that my oil was about 1L low. This is very concerning, as a week ago I swear it was full. This is just after a 600 mile trip. The car's been behaving quite normally and the exhaust during revs appears normal...

I had the car parked for 5 days and did not observe any drips or spills in the parking spot! I also looked around in the engine bay from above and could not find any oil leaks. It's bone dry. I do however have the lower splash guard panel still installed so maybe that's hiding it? I'll monitor it some more...

I thought it could be the CCV so I turned on the engine and opened up the oil cap to listen for any suction (no signs). I did notice that I have another problem though, a vacuum leak. It's very, very loud and it sounds like it's coming from the DISA on the driver's side.

Luckily I have my bro's E39 530i to compare to, we started that car up as well to compare and I definitely have a vacuum leak of sorts. I have no dash warning lights, and am just about to head back out into the frigid cold to run a scan for codes.

I am really new to this, so any help/tips would be much appreciated!

Thanks guys. Looks like 2014 isn't agreeing with my car. :innocent

[alexandre]

The splash guard is there for that - it can contain a large amount of oil before starting to pool on the driveway.

Keep in mind, if you're in a cold area, the oil could've thinned out. Proper check is 5 mins after turning off the engine after it has run for a while I think.


iP4S + TT2

[Dave1027]

Pull the disa and do the diaphram test. Maybe it's only the o-ring leaking. Still, I'd do the gas disa upgrade if the diaphram is still good. Also, for the oil burning look at Smolck's recent threads or just replace the CCV system. It could be the leak you are hearing is coming from a split CCV pipe.

[BavarianZHP]

Update:

No oil leak. I panicked a bit. Short story is that I measured it incorrectly right after shutting it down (no 15 min wait). The yellow low oil pressure light came on the dash and stayed there after I shut off the car causing my panic episode (since I've never had it do that). LOL. Never will I do that again. I measured it just now and all is well after 15 mins.

On the vacuum leak: The hissing does not immediately go away after I shut down the car. It lasts for maybe 5 secs then suddenly cuts off. Also it doesn't throw any codes. The car's clean.

I did repair the DISA using the GAS system last summer. Perhaps that had something to do with it...

[alexandre]

Check your intake boots too. Common source of vacuum leaks.


iP4S + TT2

[BavarianZHP]

Thanks will do. Also the car behaves completely normal - normal idle revs, normal driving, no stuttering. Just a abnormally loud hiss coming from around the DISA area.

[alexandre]

How is it when driving?


iP4S + TT2

[BavarianZHP]

No whistling noise (or anything abnormal) while driving. I can't hear it while I'm in the car with the windows rolled up. It's very noticeable with the hood open though.

[Dave1027]

A smoke test may isolate it. You blow smoke into the intake and watch where it comes out.

[BavarianZHP]

Anyone find mechanic stethoscopes useful??? I am thinking of picking one up. I'm a firm believer of diagnosing the issue first rather than tearing everything apart to diagnosis it (it limits variables as well). Just my engineering practices getting the better of me.

[Reckless]

No whistling noise (or anything abnormal) while driving. I can't hear it while I'm in the car with the windows rolled up. It's very noticeable with the hood open though.

I am dealing with the same thing. I have been chasing the lean codes for a while and the other day while I was outside piddling around I opened the hood and noticed the same exact sound. I also had done the GAS kit about 8 months ago, new upper and lower intake boots etc... This past Saturday I was taking the DISA back out to check and make sure everything was in working order, and I broke the F connector on the vacuum hose to the fuel pressure regulator, so be careful. Also the vacuum line to the FPR is very worn, so check that while you are in. Once the DISA was removed, I tested the flap and noticed that the vacuum pot will not hold the flap all the way closed, but it turns about 30 degrees open and holds. Once i release the vacuum pot the flap snaps open. I was thinking it was me not properly removing the old O ring and this one did not sit right, but I am now thinking it is the flap. New DISA will be ordered and while its apart, I think I am going to go on and order the parts to change out the CCV. The only other option I can think is a gasket seal, but you wouldn't hear the whooshing sounds I am hearing from a gasket seal unless something was very very wrong. Let me know if you want a video to confirm the sound is the same.

My engineering practices just mean me taking it apart, breaking something, and having to fix it

Brian