Hehehe Always wanted to do that guys Sorry!

Anyway

Seriously we have done a head gasket replacement on this Ka. It was a runner when it came in but now it just cranks until it attempts to fire, at which point it stops cranking. I think the starter is ECU controlled & this is why it stops cranking when the PCM assumes it has fired up.

Anyway tests done thus far.....

Scan revealed no DTC's
Good CMP CKP captures taken (no good reference to compare against unfortunately)
Fuel pressure good.
Valve timing checked & rechecked
Injector rail removed & sequential injection confirmed. (hopefully confirming correct cam/crank relationship)
Compressions not tested, but it sounds right & no cause to doubt it.
Weak spark observed on all plugs.
New coil pack, HT lead & plug tried (in stock & quick to prove a point)
Ignition primary on both coils scoped & the following capture taken...........

It seems pretty obvious to me that there is an ignition issue with this, but I can’t explain what I am seeing in the capture. There is a second grounding of the primary circuit very shortly after the main firing event.

Any input guy's. Dont be shy!

Cheers all

Dave (Hill)