Cylinder pressure

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RS-4
OneWave
OneWave
Posts: 23
Joined: Sun Jun 20, 2010 10:10 am

Cylinder pressure

Post by RS-4 »

Hello society
I have a VW Amarok 2018 with a 3.0 V6 TDI engine (DDXB) that has an unstable idle and as far as I can see misfires on the cylinder nr.2.
There are no errors in the engine computer. I am confused by the fact that the pressure in the second cylinder varies, i.e. 80% is weak but 20% is relatively ok. Previous garage installed new valve lifters and new injector on cyl.nr.:2.
Based on the video, can someone help me with the analysis waveform? My next step is to remove the cylinder head... Is that ok?
Thanks in advanced
Regards
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Iver
TwoWaves
TwoWaves
Posts: 182
Joined: Mon May 27, 2019 2:55 pm

Re: Cylinder pressure

Post by Iver »

That is strange !

The low compression on that cylinder is not constant. I would not be in a hurry to take the cylinder head off just yet.

My thoughts are Valve Lifters or a Sticky Valve would cause that. I would use a Pressure Transducer (WPS 500) In the Cylinder and at the Dipstick at this stage to get a good idea of what is going on and why ?

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