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Thread: 'rough running' Cylinder 6 Thor p38 MAF?

  1. #1
    Join Date
    Oct 2019
    Location
    Brisbane
    Posts
    12

    'rough running' Cylinder 6 Thor p38 MAF?

    Hi guys,

    My nanocom is indicating that I'm getting rough running on several cylinders but its more apparent on cylinder 6. Cylinder 6 is also persistently logging misfires and throwing error codes (p0306). I'm also getting a p1319 code. I have also got various lambda sensor error codes and other misfire codes which come and go.

    The car is not audibly misfiring and seems to drive ok

    Replaced so far:

    Plugs
    leads
    coil packs

    The nanocom is also suggesting outrageous MAF readings, in the range of >24 g/s at idle. These readings rise in proportion to the engine revs.
    My understanding of engine sensors (what each does, how they interact), fuel trims etc is still somewhat limited. Does anyone have readouts of a properly running engine?

    Is it possible that a faulty MAF could effect a single cylinder? I've attached the readout of my nancom sitting in my driveway after a spin around the block.Any suggestions on what to try next?

    Cheers
    Attached Images Attached Images

  2. #2
    Join Date
    Feb 2009
    Location
    Moe
    Posts
    1,373
    It seems to me that your MAF reading is low, even for idle. I reckon your O2 sensors are looking good given your fuel trim numbers.
    Id be replacing the MAF and doing an adaptive reset.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Detroit(R) Nanocom

  3. #3
    Join Date
    Oct 2019
    Location
    Brisbane
    Posts
    12
    Quote Originally Posted by biggin View Post
    It seems to me that your MAF reading is low, even for idle. I reckon your O2 sensors are looking good given your fuel trim numbers.
    Id be replacing the MAF and doing an adaptive reset.
    Thanks Biggin, I had another look this morning and I think the O2 sensor for bank 2 is faulty. 1 02 sensor is fluctuating between .1 and .9 (which I understand is how they work) while 2 sits at about .4. I can't imagine that's the solution to rough running in a specific cylinder but it certainly can't be helping.

  4. #4
    Join Date
    Feb 2009
    Location
    Moe
    Posts
    1,373
    Its true what you say about the O2 sensors operation.
    It does seem that #2 is faulty. However it is strange that both your fuel trims are close to 1.00.
    When I had problems with my sensor, trim on the bad side was around 1.40.
    Have you tried an adaptive reset? It wont hurt.
    2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Detroit(R) Nanocom

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