SPONSORED LINKS

1995 BMW 525i engine problems

Tiny
AGH
  • MEMBER
  • 1995 BMW 525I
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 328,000 MILES
Our car is emitting black smoke upon start up and runs rough. After it warms up the engine smooths out, but there is blue smoke coming out of the exhaust pipe. We are getting oil building up in the air fliter box. Over time the oil accumulates to about 1/8 "in the air filter box. Then the car begins to run rough. If we wipe out the air fliter box and get rid of the oil the car runs smooth again. The car has always been serviced with synthetic oil.
Can you tell us what is causing this and how it can be fixed?
SPONSORED LINKS
Thursday, January 14th, 2010 AT 9:49 PM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Black and blue smoke certainly indicate a problem. There is an intake manifold leak causing oil to pool in the airbox, that is very possibly where the blue smoke is coming from. Black smoke is running too rich of a mixture. The M-50 motor was not intended to run synthetic oil. BMW intended it to have 20w50. Get the intake checked for vacuum leaks, I usually use a smoke machine to find intake leakage.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Friday, January 15th, 2010 AT 9:01 AM

Please login or register to post a reply.

Related Engine Runs Rough Content

Is it Safe to Drive Check Engine Light?
VIDEO
Is it Safe to Drive Check Engine Light?
Instructional repair video
Check Engine Light
GUIDE
Check Engine Light
Why is my check engine or service engine soon turned on? In this guide we talk about what this is associated with this notorious light, what it is used for and what you...
VIEW MORE

Sponsored links