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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 > Well that was strange....



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      01-28-2013, 09:37 PM   #1
monkey_wrench
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Well that was strange....

Drove home from work, 45 minute drive, drop off coworker, park car on a slight incline (rh side of car low), go inside with him for 30 minutes, and when i leave, the car starts but runs like on 5 cylinders, with an exceptionally loud valve tick. Exceptionally loud!

Shut it down, start it again, same thing, rough on 5 cylinders, loud valve or lifter tick. This time, i give it some gas, and it clears right up, and continues to run smooth as always.
Drive home, no problems.

Go to investigate, and find oil low. 1 qt brings it to 75% full.
Could a hydraulic lifter have ran out of oil due to the low oil level and incline i was at? The BMW cylinder head design apparently leaves much to be desired when it comes to oiling the lifters.
My car is an '06 330i with 111000 miles, so no warranty cylinder head replacement for me.

Filled up the oil, shut down and started a bunch of times, drove around time, spirited and normal, and no further problems noted.

Thoughts anyone?
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      01-29-2013, 03:57 PM   #2
zandermort
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so what's your question?
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      01-29-2013, 04:14 PM   #3
e90pilot
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Could be. Maybe you had a slight drop in oil pressure due to the incline but you said it was slight. Could have also been a slight clog that cleared as well.
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      01-30-2013, 06:51 AM   #4
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Quote:
Originally Posted by zandermort
so what's your question?
My question? Thoughts on what happened? Anyone else experience this?
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      01-31-2013, 01:39 AM   #5
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I have run an E36 M3 low before cause it started burning oil and forgot to check regularly. it would get a rough idle and once topped off, smoothed out.

An E9x should never get there because the level sensor should fire a low level warning so I suspect the sending unit may be bad. That plays more than the incline IMO because they were probably dry already and would likely have shaken on flat ground very soon too.

Suggestions would be to get your level sensor replaced and maybe take a peek through the filler cap once a month to make sure the system looks wet.
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