Did anyone measured the cranking compression waveform for an Z18XER engine?
Got this car with misfire and poor running / idling. I believe injectors clogged, but have a look on the waveform. I've never seen a second pressure dip in the intake stroke.
Not normally any adjustment possible to the valves, they are hydraulic tappets. The compression is low by 4 to 6 bar. The intake depression is not recongised within the trace, pointing towards the inlet valves not opening correctly during the intake stroke.
@kona, it will be no other measurement. I was wondering if anyone else’ve seen this before. Again, that is engine off, cranking, pedal to the metal.
You say that second dip is because of VVT. I tend to believe that, but I am not 100% sure.
Not normally any adjustment possible to the valves, they are hydraulic tappets. .........
To make you understand :
Sorry for confusion, I was not referring to the VVTi unit(s) when I said not normally adjustable. I was referring to the valve clearances, which are normally hydraulic buckets operating with a zero lash clearance.