03 BMW engine problems

MAJORPAYNESAUTOREPAIR

MEMBER
2003 BMW 330CI
6 CYL
2WD
AUTOMATIC
91,000 MILES

03 bmw 330ci back firing and missing
p0300 random missfire
p0313 low rpm missfire
p0171 and p0174 left and right banks lean

Saturday, November 27th, 2010 AT 12:03 AM

4 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.

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Saturday, November 27th, 2010 AT 12:10 AM

MAJORPAYNESAUTOREPAIR

MEMBER
2 POSTS

No vacuum leaks, fuel pressure good, my scanner does not support european so can not get anything on mass air flow and bmw does not use egr they us A.I.R

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Saturday, November 27th, 2010 AT 1:04 AM

DOCHAGERTY

MECHANIC
9,601 POSTS

To find the root cause may require having BMW specific scanning equipment. What method did you employ to assure there are no vacuum leaks? What was the fuel pressure? Has the engine had cam timing checked? More history and a more detailed story of what has been done and how the car showed up at your shop might shed some light and would go a long way in our being able to help, otherwise we are in the dark here.

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Saturday, November 27th, 2010 AT 4:17 AM

DOCHAGERTY

MECHANIC
9,601 POSTS

Also, what coils are in the engine? The 2003 cars had lots of coil issues, pull one and describe it to me please, what color is it, is it Bosch or Bremi?

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Saturday, November 27th, 2010 AT 4:31 AM