i just discovered my 1999 bmw e46 has a tear and crack on intake boot and engine stalls when you start it and eventually switches off but when i disconnect air flow sensor it works perfectly

Asked by Feb 26, 2015 at 12:05 PM about the 1999 BMW 3 Series

Question type: Maintenance & Repair

3 Answers


Replace the boots and clean the MAF and see if things improve. Do you have a CEL on?


Disconnecting the MAF causes the ECU to use the TPS and default fuel maps. These maps are defaulted to enriching the air/fuel mixture and that's why things work better. Vacuum leaks, aka ripped hoses after the MAF will make your car run terrible.


In my BMW Z4 that I used to own...even a miss-installed oil fill cap will make the cel light come on and the idle very rough. These cars are very sensitive to un-metered air leaks.

Your Answer

3 Series

Looking for a Used 3 Series in your area?

CarGurus has 32,941 nationwide 3 Series listings starting at $1,000.


BMW 3 Series Experts

  • #1
    Tom Demyan
  • #2
    Robert Charlson
  • #3
    Matt Mankinen
View All

Related Models For Sale

Used BMW 5 Series
377 Great Deals out of 16,040 listings starting at $1,650
Used BMW M3
19 Great Deals out of 1,739 listings starting at $5,495
Used Mercedes-Benz C-Class
582 Great Deals out of 25,346 listings starting at $1,950
Used Audi A4
191 Great Deals out of 12,355 listings starting at $1,700
Used Ford Mustang
289 Great Deals out of 38,304 listings starting at $1,995
Used Honda Accord
543 Great Deals out of 93,150 listings starting at $1,495
Used BMW 7 Series
116 Great Deals out of 4,988 listings starting at $2,699
Used BMW X5
312 Great Deals out of 17,067 listings starting at $2,991
Used Mercedes-Benz E-Class
424 Great Deals out of 20,640 listings starting at $1,999
Used Chevrolet Camaro
248 Great Deals out of 29,862 listings starting at $4,980
Used Honda Civic
350 Great Deals out of 51,838 listings starting at $1,200

Used Cars For Sale

2018 BMW 3 Series For Sale
67 Great Deals out of 8,583 listings starting at $27,935
2017 BMW 3 Series For Sale
81 Great Deals out of 2,607 listings starting at $23,350
2016 BMW 3 Series For Sale
38 Great Deals out of 1,015 listings starting at $15,350
2015 BMW 3 Series For Sale
165 Great Deals out of 4,067 listings starting at $13,999
2014 BMW 3 Series For Sale
179 Great Deals out of 3,211 listings starting at $8,975

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.