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2012 C250 P0340 triage

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2012 C250 P0340 triage

 
Old 02-09-2019, 06:47 PM
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2012 C250 Sedan
2012 C250 P0340 triage

Hi all, I have a 2012 C250 with approximately 80k miles.
I recently started experiencing long cranks (extra second or two), a check engine light, and a P0340 code pulled by an inexpensive ODB II reader.
Google searching led me here where I read all the threads I could find. I am trying to DIY the repair, but not sure where to go next.

So far I have replaced the camshaft position sensors.
I pulled the valve cover off and observed the following:
  • the timing chain does not appear to be stretched
  • cam adjuster sprockets don't look worn
  • with the crankshaft pulley at 0 degrees, the marks on the larger, outside part of the cam adjusters line up with the marks on the engine.
  • the mark on the smaller diameter portion of the intake adjuster doesn't line up, but I assume that is okay
I don't know what or how to test continue triaging the issue. Is there a more scientific way of testing for timing chain stretch? How do I test for malfunctioning cam adjusters?

Below are pictures of my intake and exhaust cam adjusters when crank pulley is at TDC.

Intake camshaft adjuster

Exhaust camshaft adjuster
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Old 02-10-2019, 06:26 PM
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Just checking again, I notice when rotating the engine manually, sometimes the intake camshaft adjuster marks are in line and look correct, and other times the timing mark closest to the cam is slightly ahead of where it should be. Should there be that much 'play' in the adjuster?

Also, sorry about the double post... there is another post in this forum describing the same issue. I would like to delete it, but can't figure out how.

Thanks for any advice!
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Old 02-11-2019, 01:54 PM
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Old 02-12-2019, 12:37 AM
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Old 02-13-2019, 07:20 PM
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https://mbworld.org/forums/c-class-coupe-c204/604301-help-long-crank-time-code-p0340.html

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