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X3 E83 (2004 - 2010)
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  #1  
Old 05-16-2016, 06:24 PM
tedX3 tedX3 is offline
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Location: philadelphia pa
 
Join Date: May 2016
Posts: 13
Mein Auto: BMW X3
Fuel pressure

I have a issue with running over rich.

This might be due to excess fuel pressure, will pick up a pressure tester and check. Over lean conditions are more common, and I have had those, from various air leaks, but that is now all solved.

I had replaced the fuel pump and the filter / regulator, and now can't get rid of the over rich error codes, both banks. I wonder if somehow I got a bad regulator or if somehow I managed to install it wrong. Not sure what else could cause over rich.

Replaced airflow sensor and injectors, no real change....

Does anyone know what the correct fuel pressure is? 2006 X3 3.0
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  #2  
Old 05-16-2016, 06:34 PM
x3brian x3brian is offline
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Location: Sacramento CA
 
Join Date: Jan 2011
Posts: 1,241
Mein Auto: X3
I'm giving a controversial answer assuming no vacuum leaks.

Throw some techron in it and drive a full tank distance (400-450 miles). Then clear the codes with a BMW dis.

My bet is it will go away. Note...one overlooked minor vacuum leak to check is the rubber hose on the exhaust that controls the flapper. It can cause a rich condition.
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Old 05-23-2016, 09:46 AM
tedX3 tedX3 is offline
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Location: philadelphia pa
 
Join Date: May 2016
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Mein Auto: BMW X3
OK here is some actual info. If you replace the fuel filter/regulator and then get a over rich code, you might have the wrong regulator.

For a 2006 X3 the fuel pressure should be 50 PSI, for a newer one (not sure what year this is changed) the pressure is 70 PSI.

With the wrong pressure it will run, but it won't pass emissions and will throw codes, and will coat the plugs in carbon.

The two filters/regulators look the same, best way to know for sure is a $45 fuel pressure test kit. DO be careful when dealing with fuel under pressure it can spray and you don't want it in your eye, also liquid fuel may not be real flammable, but fuel spray that should be easy to light off.
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