One of the 4 compression humps is higher than the other 3 indicating higher compression in that cylinder?
I saw that, i edited my post as i missed you say in for a misfire.
Well without WPS or FLS i can't think of a way to 'none intrusively' see the valve events ........... only if it was MAF & an intake valve, looks exh valve to me with the comp hump......
Leaking inlet valve. Two normal humps - compressions, followed by a slightly lower hump which I'm thinking is air leaking into the inlet manifold which
is making 'puffing' noise out of the air intake
The next cylinder now has a better VE there fore shows the higher comp hump.
Customer gave the go ahead to strip engine down to inspect what was going on but we didn't get far, on this engine the injectors need to be removed along with the glow plugs to remove the rocker cover.
All 4 injectors are seized solid and will need someone in with the gear to pull them out.
Phoned customer and explained costs would go up before we even got cylinder head off and also gave the option of a s/h engine but they are pricey units for this vehicle
At 200k miles and also needing other work on the vehicle, he has decided to scrap it due to lack of funds so this one won't have an outcome which is a shame as i would of liked to seen what was causing the fault.
Thanks to Robski, Fat Freddy and Avdr for the help/suggestions