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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 08-27-2016, 08:38 AM
dzdavid8 dzdavid8 is offline
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Mein Auto: 2001 325i and a 2009 335x
Misfire 2001 325i

I'm having some problems with a 2001 325i. It doesn't seem to have all of its power and when I get onto the highway after a little while of driving with the rpms a little over 3k the car looses all its power and misfires. Codes say lean bank 1 and 2 with lack of fuel misfires. Anyone know what it could be? Already put in a new fuel pump, fuel filter, and intake boots. I took out the injectors and cleaned the tips. Now when I start it it misfires right away on start up.

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  #2  
Old 08-28-2016, 07:46 AM
marcozandrini marcozandrini is offline
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What are the exact codes? What tool are you using to read the codes?
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  #3  
Old 08-28-2016, 07:50 AM
dzdavid8 dzdavid8 is offline
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Mein Auto: 2001 325i and a 2009 335x
Auto zone read the codes. Misfire on 3,5, and 6 and misfire on 5 and 6 lean fuel. And lean bank 1 and 2

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  #4  
Old 08-29-2016, 06:44 AM
marcozandrini marcozandrini is offline
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You need to check the fuel pressure. There's a test fitting on the fuel rail. Item #2 in the following link is the cap for the test valve. The pressure needs to be at least 45psi at all revs.

http://www.realoem.com/bmw/enUS/show...diagId=13_0900
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  #5  
Old 08-29-2016, 06:55 AM
dzdavid8 dzdavid8 is offline
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What if it isn't?

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  #6  
Old 08-29-2016, 06:55 AM
dzdavid8 dzdavid8 is offline
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What would fix that. It has a new pump

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  #7  
Old 08-29-2016, 08:39 AM
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Fast Bob Fast Bob is offline
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Originally Posted by dzdavid8 View Post
What would fix that. It has a new pump

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Was the fuel filter replaced at the same time ? They get pretty nasty inside over time....
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  #8  
Old 08-29-2016, 08:57 AM
dzdavid8 dzdavid8 is offline
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Within a month of each other

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  #9  
Old 09-04-2016, 04:16 PM
dzdavid8 dzdavid8 is offline
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Mein Auto: 2001 325i and a 2009 335x


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  #10  
Old 09-04-2016, 04:16 PM
dzdavid8 dzdavid8 is offline
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These are the codes

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  #11  
Old 09-05-2016, 06:03 AM
marcozandrini marcozandrini is offline
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Mein Auto:
The P0171 is a classic indication of a vacuum leak. But, my first recommendation is to check the fuel pressure. There's a test valve under the black, plastic cover on the top of the engine. item #2 in the link is the cover for the test valve.

http://www.realoem.com/bmw/enUS/show...diagId=13_0900

Pressure must be at least 45psi.
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  #12  
Old 09-07-2016, 09:59 PM
click.bmw click.bmw is offline
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Mein Auto:
Mis fire can be caused by three thinks. 1 no air or less air 2 fuel or low fuel 3 spark check spark plugs coils sensor 1 bank 2 mean ur first o2 sensor reading is different from ur second sensor meaning simple words is lean mean something is less
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