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Thread: Cylinder #6 Misfire, only at ~6krpm

  1. #21
    Join Date
    Jan 2016
    Location
    Chicago area
    Posts
    1,754
    I had a rattling noise too. After a few days, it settled and went away. Believe the cause was the same.

  2. #22
    Headers installed. The power is back and after a few pulls, no misfire. She's young again!

    I'll run the car for a week, if the misfires do not return, we can consider this case solved.
    2003 Blue ZHP Sedan @ 210k
    Dead due to damaged valve. She will be resurrected.

  3. #23
    Join Date
    Jan 2019
    Location
    Tampa, FL
    Posts
    196
    So exhaust leak?
    '04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 111k
    '98 740il | Schwartz 2 | Sandbeige | 5AT | 238k | lowered on Bilsteins w/ B&G springs
    '00 540i sport | Titanium silver | Black | 5AT | 120k
    '85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 215k | one owner, all original

  4. #24
    I would say so. That and/or a combo of clogged cats.

    Sent from my Pixel 2 XL using Tapatalk
    2003 Blue ZHP Sedan @ 210k
    Dead due to damaged valve. She will be resurrected.

  5. #25
    Join Date
    Jan 1970
    Location
    Southern California
    Posts
    16,983
    great news!
    Randeaux/Rando/John/jr - '06 Cic ZHP; Southern California
    "ZHP or not, I still like you"


    ZHP Performance Package, Cold Weather Package, Leather, Jet Black/Black/BlackCube, NAV
    ESS Stage 1 Twin Screw Supercharger, Sprint Booster, BMW Perf Intake, Magnaflow Exhaust, Dinan TB & STEP S/W, Ground Control Coilovers, UCC Sway Bars, Apex EC-7 18x8.5 ET38
    Dynavin D99+, Hardwire V1 (w/V1 Connection), BSW Stage 1 Speakers, Kicker Amp/Subwoofer
    BMW Performance Strut Brace, Orion V2 Angel Eyes, No-holes License Plate, SMG Paddle Shift Mod, Besian VANOS, Gold DISA, Fan Delete, M3 Side Mirrors
    Note: Actual car no longer resembles signature picture

  6. #26
    She died on me today as I took her to redline in third. I was on the highway, airing it out, hit the rev limiter and got the same misfire code/symptoms as before. I'm thinking in my head that the problem isn't solved yet. I cycle the ignition on and off, but the problem doesn't go away. It has gotten worse. It feels like about 3 or 4 cylinders are completely out, very difficult to start due to the missing cylinders. I was able to limp it home and try to read codes, but I don't get anything but the cyl 6 misfire code.

    I'm wondering if my timing jumped? Fuel is good, I *think* ignition is good. I need to do a compression test next...
    2003 Blue ZHP Sedan @ 210k
    Dead due to damaged valve. She will be resurrected.

  7. #27
    I found the root of this issue in the form of a broken keeper on cylinder #6

    Sent from my Pixel 2 XL using Tapatalk
    2003 Blue ZHP Sedan @ 210k
    Dead due to damaged valve. She will be resurrected.

  8. #28
    Join Date
    Nov 2016
    Location
    Charlotte, NC
    Posts
    2,616
    Wait...so only one of the exhaust valves was opening on 6?

  9. #29
    It was probably opening fine...the closing part is questionable.

    Sent from my Pixel 2 XL using Tapatalk
    2003 Blue ZHP Sedan @ 210k
    Dead due to damaged valve. She will be resurrected.

  10. #30
    Join Date
    Nov 2017
    Location
    Irvine, CA
    Posts
    189

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