Missing 3 cylinders

Discussion in 'Technical' started by XLR8ME, Dec 10, 2011.

  1. XLR8ME

    XLR8ME Two Zeds r better than 1

    '92 AUSpec Auto NA with a rebuilt engine and new wiring loom fitted about 7000Kms ago.

    Symptoms:
    When started this morning, major miss. The car shuddered horribly when in gear. I put it away as I had to go out.

    I've just checked using conzult and done the power balance test. It shows cylinders 1, 3 and 5 not firing (or not firing properly)

    No codes, series 2 PTU.

    Any ideas where to look before I start pulling things apart?

    All help appreciated

    Cheers
    Andrew
     
    Last edited: Dec 10, 2011
    XLR8ME, Dec 10, 2011
    #1
  2. brisz

    brisz Well-Known Member

    Any recent work performed ?
     
    brisz, Dec 10, 2011
    #2
  3. awgazm

    awgazm Active Member

    Have you checked the spark on cylinders and also listened for each cylinder injector firing, Check you Cas if it's not doing 1 or the other... That's just for starters. It will wipe out a few potential issues
     
    awgazm, Dec 10, 2011
    #3
  4. XLR8ME

    XLR8ME Two Zeds r better than 1

    No recent work done, just the normal fluid checks.

    I'll check for spark on those cylinders. I'll check the CAS plug and PTU plugs as well, for starters.

    Cheers
    Andrew
     
    XLR8ME, Dec 10, 2011
    #4
  5. brisz

    brisz Well-Known Member

    There have been a few threads reporting a similar problem.

    http://www.google.com.au/#sclient=p....,cf.osb&fp=6676fa77a2e4d36f&biw=1280&bih=795

    This one talks about a cam locating pin problem.

    http://www.aus300zx.com/forum/showthread.php?t=280693

    Dont know if this IS your problem or if it can cause valve piston damage, but given your rebuilt engine is 7000k's old I would have a chat with the workshop, not so much from a warranty perspective, but working together could save a lot of tears for both.
     
    Last edited: Dec 11, 2011
    brisz, Dec 10, 2011
    #5
  6. a2zed

    a2zed Guest

    One of two things could be wrong

    1.You have a large vacuum leak on the passenger side of the plenum.
    Potential points of large leaks are:

    Intake resonator below passenger headlight
    6mm vac hose from carbon canister to under plenum pipe
    IACV hoses
    Intake accordian
    EGR port under plenum

    2. Intake cam gear locating pin has sheared on driver side putting that 1 camshaft out of phase.

    To check this you must gain access to that cam gear, remove the front cover plate and physically eyeball the pin to ensure it is where it should be.
     
    a2zed, Dec 11, 2011
    #6
  7. XLR8ME

    XLR8ME Two Zeds r better than 1

    Thanks

    Thanks for the ideas guys. looks like I've got some work to do tomorrow.

    I hope it's not the camshaft pin, but it's a Z, and Murphy's laws does apply.....:(

    I'll post up what I find tomorrow

    Cheers
    Andrew
     
    XLR8ME, Dec 11, 2011
    #7

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