Rough idle after changing valve cover gasket

mathematics · 07-12-2016, 04:15 PM

Hey guys. I just changed the valve cover gasket bc of a leak at around 70k miles. Now I am getting a rough idle and an error code that says something about fuel mix (I didn't record the error but I will when I get back to look at it at the shop this weekend). Any idea what it could be? It sounds ok in the engine bay but you can really hear it at the exhaust tips. It sounds like a chugging sound.

fravel · 07-12-2016, 04:20 PM

I would guess vacuum leak.

mathematics · 07-12-2016, 04:21 PM

How would I check for a vacuum leak? Sorry if it's a n00b question, but I don't get involved much with the mechanical aspects of the car, just the audio. The install was done by a mechanic friend.

5tony · 07-12-2016, 04:47 PM

Did he reconnect the hose that connects at the back of the engine against the firewall?

mathematics · 07-12-2016, 04:48 PM

Quote:

Originally Posted by 5tony

Did he reconnect the hose that connects at the back of the engine against the firewall?

I believe he did but I will check that

Efthreeoh · 07-12-2016, 09:17 PM

I agree, probably a vacuum leak at the oil breather hose. Your friend may have inadvertently broke it.

08TUNDRA · 07-14-2016, 08:02 PM

MI need broke when I did my vcg. It's very brittle mine took no effort to break but it was only 64 from the dealership same day.

07-12-2016, 04:15 PM	#1
mathematics Captain 69 Rep 994 Posts Drives: 08 328i e93 alpine white Join Date: May 2009 Location: Queens, NY iTrader: (0)	Rough idle after changing valve cover gasket Hey guys. I just changed the valve cover gasket bc of a leak at around 70k miles. Now I am getting a rough idle and an error code that says something about fuel mix (I didn't record the error but I will when I get back to look at it at the shop this weekend). Any idea what it could be? It sounds ok in the engine bay but you can really hear it at the exhaust tips. It sounds like a chugging sound. __________________ iPhone 6 Plus (iTunes library/iTunes radio/Waze, etc) to Airport Express via AirPlay. Toslink out of Airport Express to Helix P-Six DSP. PHD AF 1.C tweeters, PHD FB 4.1 midranges. Jehnert Door Cards and mid-bass'.
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07-12-2016, 04:20 PM	#2
fravel Colonel 1645 Rep 2,494 Posts Drives: Monaco Blue '06 330i Join Date: Aug 2012 Location: The Nasti 'Nati iTrader: (1)	I would guess vacuum leak. __________________
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07-12-2016, 04:21 PM	#3
mathematics Captain 69 Rep 994 Posts Drives: 08 328i e93 alpine white Join Date: May 2009 Location: Queens, NY iTrader: (0)	How would I check for a vacuum leak? Sorry if it's a n00b question, but I don't get involved much with the mechanical aspects of the car, just the audio. The install was done by a mechanic friend. __________________ iPhone 6 Plus (iTunes library/iTunes radio/Waze, etc) to Airport Express via AirPlay. Toslink out of Airport Express to Helix P-Six DSP. PHD AF 1.C tweeters, PHD FB 4.1 midranges. Jehnert Door Cards and mid-bass'.
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07-12-2016, 04:47 PM	#4
5tony Lieutenant 147 Rep 500 Posts Drives: '21 M5/'15 X5 35i/'88 M3 Join Date: Jul 2010 Location: Atlanta iTrader: (1)	Did he reconnect the hose that connects at the back of the engine against the firewall? __________________
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07-12-2016, 09:17 PM	#6
Efthreeoh General 17309 Rep 18,733 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	I agree, probably a vacuum leak at the oil breather hose. Your friend may have inadvertently broke it. __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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07-14-2016, 08:02 PM	#7
08TUNDRA Lieutenant 125 Rep 445 Posts Drives: 2008 e92 335i Join Date: Jul 2014 Location: San Diego CA iTrader: (6)	MI need broke when I did my vcg. It's very brittle mine took no effort to break but it was only 64 from the dealership same day.
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