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I have a 1992 750il. It is burning oil. What could be causing this?

Sent to Car Experts April 08 03:05 PM

It is smoking.

 

Optional Information:
1992 BMW 750il

Customer (name blocked for privacy)
Status:  Closed   Value: $15
Info Request
April 8 4:39 PM (1 hour and 34 minutes and 37 seconds later)
         
REPLIED to Info RequestCheck Mark

Hi

Are you positive it is oil being burned? Is the smoke blue?

Cheers

Geordie



Please ensure that you are totally happy with any advice before clicking ACCEPT. Advice is decided upon from what you tell me, and you must be totally sure before accepting
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Geordie -- Mobile Mechanic & Motor Trader -- 98% Positive Feedback on 216 Car Accepts
22 years of mechanical experience, and I am the mechanic in my own automotive partnership
Reply
April 8 4:41 PM (1 minute and 34 seconds later)
         
Reply to Geordie's Post: No! It is more of a white.
Customer (name blocked for privacy)
Answer
April 8 4:51 PM (10 minutes and 24 seconds later)
         
REPLIEDCheck Mark

Hi again

This is underfuelling and can be due to a leaking vacuum pipe, leaking intake gasket, faulty fuel pump,blocked fuel filter, etc.....

Check for intake leaks at the pipes and seams to start with. You may be able hear the leak if you listen closely.

Have you got access or can you acquire an automotive test meter which tests volts, ohms, pulsewidth, frequency, etc?

Cheers

Geordie



Please ensure that you are totally happy with any advice before clicking ACCEPT. Advice is decided upon from what you tell me, and you must be totally sure before accepting
Picture
Geordie -- Mobile Mechanic & Motor Trader -- 98% Positive Feedback on 216 Car Accepts
22 years of mechanical experience, and I am the mechanic in my own automotive partnership
Reply
April 9 5:39 PM (1 day later)
         
Reply to Geordie's Post: The smoke is the worst when I first starty it in the morning. As I drive it the smoke becomes increasingly less. My gas mileage is horrible. I am getting about 10 mpg.
Customer (name blocked for privacy)
Reply
April 9 9:43 PM (4 hours and 3 minutes and 35 seconds later)
         
The smoke is the worst when I sart it in the morning. As I drive it the smoke begins to clear up. My gas mileage is horrible. I am getting 10 mpg.
Customer (name blocked for privacy)
Answer
April 10 6:23 PM (20 hours and 39 minutes and 26 seconds later)
         
ACCEPTEDCheck Mark

Hi

I think your vehicle is equipped with a MAF (air flow sensor) and it could very well be that there is an air leak after the sensor which is causing the O2 sensor to switch low to try and increase the fueling, hence the heavy gas usage.

Check for leaks as I outlined above and let me know what you find.

Cheers

Geordie



Please ensure that you are totally happy with any advice before clicking ACCEPT. Advice is decided upon from what you tell me, and you must be totally sure before accepting
Picture
Geordie -- Mobile Mechanic & Motor Trader -- 98% Positive Feedback on 216 Car Accepts
22 years of mechanical experience, and I am the mechanic in my own automotive partnership
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