I PUT A 2000 5 SERIES BMW MOTOR IN MY 3 SERIES 1999 BMW AND USED THE WIRING HARNESS OFF THE ORIGINAL 3 SERIES WHICH I HAD TO AND NOW THE STARTS AND IDLES FINE WHEN YOU REV IT UP IT SPITS AND SPUTTERS

Asked by CARTWRIGHT Jul 25, 2012 at 10:35 PM about the 1999 BMW 3 Series

Question type: Maintenance & Repair

I PUT A 2000 5 SERIES BMW MOTOR IN MY 3 SERIES 1999 BMW AND USED TEH WIRING HARNESS OFF THE ORIGINAL MOTOR OUT OF THE 1999 3 SERIES AS i HAD TO BECAUSE THE WIRING HARNESS WAS DIFFERENT ON THE NEW MOTOR, ANYWAY NOW CAR STARTS AND IDLES FINE BUT WHEN I REV IT UP IT SPITS AND SPUTTERS ANYONE PLEASE HELP! WHEN I PLUGGED IT INTO THE COMPUTER IT READ SOMETHING ABOUT FUEL SENSOR 1 AND 2, DOES ANYONE KNOW WHAT THE PROBLEM COULD BE OR EVEN WHERE TO START???????????ANY HELP WOULD BE GREATLY APPRECIATED!

3 Answers

5,915

Did you do the swap? Did a mechanic? The software may be the biggest difference here. Were they both automatics? Again, software can be the biggest culprit of engine performance or lack of performance. Either way, get it to a shop ASAP.

9,785

What motor did you swap over? Really need more information in order to help you out. Many things could be causing this issue, Fuel pressure, mass airflow sensor, ignition system and timing. This can get complicated in a hurry also give us the fault code numbers and a better description on what they are.

1 people found this helpful.
5,355

The engines of a 3 or 5 series are the same. They may vary on the accessories and intake or some sensors. In you can check the original engine's intake for differences do it. Also check for leakage in the intake which causes engine sputter and detonations.check the fuel pressure to be sure and also Check the mil codes for more help

Your Answer:

3 Series

Looking for a Used 3 Series in your area?

CarGurus has 1,205 nationwide 3 Series listings starting at $1,995.

Postal Code:

CarGurus Experts

  • #1
    Robert Charlson
    Reputation
    3,950
  • #2
    apbimmer98
    Reputation
    3,100
  • #3
    Abu Luca
    Reputation
    2,980
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used BMW 5 Series
27 Great Deals out of 332 listings starting at $4,800
Used BMW M3
7 Great Deals out of 99 listings starting at $15,995
Used Mercedes-Benz C-Class
81 Great Deals out of 1,429 listings starting at $3,499
Used Ford Mustang
49 Great Deals out of 1,268 listings starting at $4,995
Used BMW M5
41 listings starting at $26,800
Used BMW X5
50 Great Deals out of 1,199 listings starting at $3,900
Used Mercedes-Benz E-Class
43 Great Deals out of 500 listings starting at $5,700
Used Honda Accord
40 Great Deals out of 908 listings starting at $2,799

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. Content will be removed if CarGurus becomes aware that it violates our policies.