Slight rough idle

maximoline · 03-22-2020, 11:26 AM

Someone please help me figure out why I'm having this problem on my 328i after I changed the valve cover

Codes:
P00BC-MAF "A" Circuit Range/Performance Flow Too Low
P0171-system too lean bank 1
P0174-system too lean bank 2

ny325 · 03-22-2020, 12:40 PM

Have the same issue. It usually happens when the weather is cold.

maximoline · 03-22-2020, 12:49 PM

Quote:

Originally Posted by ny325

Have the same issue. It usually happens when the weather is cold.

No this has been happening to me since I changed the valve cover gasket and it hasn't been cold

relative4 · 03-22-2020, 01:14 PM

Probably cracked a vacuum hose during the job. Smoke test.

Mgh024 · 03-22-2020, 02:45 PM

Quote:

Originally Posted by ny325

Have the same issue. It usually happens when the weather is cold.

Can’t speak to OP, but try running fuel system cleaner.

Richwm · 03-22-2020, 02:46 PM

Did you disconnect the MAF sensor? You might need to replace the connector.
Try this it helped me.
https://www.e90post.com/forums/showthread.php?t=1304563

03-22-2020, 11:26 AM	#1
maximoline Enlisted Member 5 Rep 31 Posts Drives: 2007 Bmw 328i Coupe Join Date: Feb 2020 Location: Florida iTrader: (0)	Slight rough idle Someone please help me figure out why I'm having this problem on my 328i after I changed the valve cover Codes: P00BC-MAF "A" Circuit Range/Performance Flow Too Low P0171-system too lean bank 1 P0174-system too lean bank 2
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03-22-2020, 12:40 PM	#2
ny325 Brigadier General 895 Rep 3,141 Posts Drives: Jet Black E90 Join Date: Feb 2007 Location: Gridlock iTrader: (0)	Have the same issue. It usually happens when the weather is cold.
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03-22-2020, 01:14 PM	#4
relative4 Major 611 Rep 1,272 Posts Drives: '08 335xi E90 MT stage 1+ Join Date: Feb 2019 Location: Denver, CO iTrader: (0)	Probably cracked a vacuum hose during the job. Smoke test.
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03-22-2020, 02:46 PM	#6
Richwm Captain 65 Rep 920 Posts Drives: 06 E90 330i 6MT, 01 E46 330i Join Date: May 2006 Location: Canyon Country, CA. iTrader: (0) Garage List 2020 Jeep JLU Wrangler [0.00] 2006 (Mar 05 build ... [8.00] 2001 330i [9.00]	Did you disconnect the MAF sensor? You might need to replace the connector. Try this it helped me. https://www.e90post.com/forums/showthread.php?t=1304563 __________________ Mar 05 Build date,2006 E90 330i, Sport Package, Premium Package, TR MT-1's . V-1 Hard-wired power with custom V-1 Concealment Display . Rear fogs, Rear power outlet's, M short shifter knob, BlackLines, BMW Strut tower bar, CDV Delete, Front M3 wishbones + tension struts, BMW Performance shocks and springs, BMW Performance Brake kit F&R, OEM short shift kit. Rear M3 Guide rods and Wishbones. 2006 E-90 330i with 302,000 miles.
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