Spark plug change results, ISTA+ test, borescope in the cylinders

Spark Plugs

(Click any image for the full res version)

  • Plug 1: plug1
  • Plug 2: plug2
  • Plug 3: plug3
  • Plug 4: plug4
  • Plug 5: plug5
  • Plug 6: plug6

Results:

  • In my extremely limited knowledge of spark plug reading, these look totally normal. They all had a small 3-4mm spot of carbon in random places around the rim near the insulator. Appears to be normal when compared to other N55 plugs I’ve compared them to.
  • Prior to swapping out the plugs I ran some diagnostics in ISTA+ (BMW’s application that techs use) and paid extra attention to the “rough running cylinder values” as described in the tech notes. Anything within +/- 7.00 on the display was acceptable and prior to changing my plugs those value were all within +/- 2.00
  • After swapping those values appear to be close to +/- 0.5 !!!

    rough1
    ISTA+ results of “rough running cylinder” values

Bore-scope in cylinders:

  • I’m not really impressed with the video quality of this bore-scope I picked up. It was a $14 Amazon special, I need to try getting still images if anything as the video footage is pretty useless.
  • Cylinder 1
  • Cylinder 2
  • Cylinder 3
  • Cylinder 4
  • Cylinder 5
  • Cylinder 6
    6d
    Cylinder 6
    6c
    Cylinder 6
    6b
    Cylinder 6

     

5d
Cylinder 5
5c
Cylinder 5
5b
Cylinder 5
5a
Cylinder 5
4b
Cylinder 4
4a
Cylinder 4
3c
Cylinder 3
3a
Cylinder 3
3b
Cylinder 3
2d
Cylinder 2
2c
Cylinder 2
2b
Cylinder 2
2a
Cylinder 2
1a
Cylinder 1
1b
Cylinder 1
1c
Cylinder 1

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