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misfire on cyl 5

turbodieselro
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turbodieselro Member

turbodieselro

Posted
Posted

hey guys,

I wonder if anyone could help me with this because I`m stuck now.

I have a 996 my2004 with M96.03 engine.

Only when accelerating suddenly (full throttle) I have the misfire error on cyl 5.

I have changed the spark plugs, coils and injector valves and the error still appears on that cylinder.

I repeat, it occurs only when I ask for maximum power, when driving normally everything is ok.

Any ideas anyone?

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RFM Member

RFM

Posted
  • Moderators
Posted

It could be a bad injector or valve lifter (vario-cam + system). Use a PIWIS diagnostic tool to find out.

turbodieselro Member

turbodieselro

Posted
  • Author
Posted
It could be a bad injector or valve lifter (vario-cam + system). Use a PIWIS diagnostic tool to find out.

the injectors were swapped, same result...

maybe the vario-cam system could be damaged but can it be only for one cylinder?

  • Admin
Loren Member

Loren

Posted
  • Admin
Posted
It could be a bad injector or valve lifter (vario-cam + system). Use a PIWIS diagnostic tool to find out.

the injectors were swapped, same result...

maybe the vario-cam system could be damaged but can it be only for one cylinder?

As RFM said - Use a PIWIS diagnostic tool to find out.

Everything is just a guess without proper diagnostic tools.

function12 Member

function12

Posted
Posted (edited)
It could be a bad injector or valve lifter (vario-cam + system). Use a PIWIS diagnostic tool to find out.

the injectors were swapped, same result...

maybe the vario-cam system could be damaged but can it be only for one cylinder?

Yes it can be just one cyclinder. I had that same problem. Thank God it was covered under warranty. Some will say a fresh oil change might lossen it up. I heard there are special tools need to keep the cams in place.

Edited by function12
  • 2 months later...
turbodieselro Member

turbodieselro

Posted
  • Author
Posted

And yes, the PIWIS is giving me the following faults:

P0300 Misfire detection (Total)

P0305 Misfire, cyl 5

P1371 Valve lift control, checksum error

P1364 Valve lift control, cyl 5

So, what do you think guys? Should I replace the variocam adjusting unit or rather this fault comes from a hidro tappet (on cyl 5) malfunction?

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