LPG2CV wrote:If I recall, sheilding should only attach to ground on the board and nowhere else.Shielding is grounded to ECU ground at firewall only. if I could better explain, 3 wires at cam and crank sensors. Pos, neg and signal shielded wire, the shielded wire braid is earthed at the firewall connection. I could go right up to ECU but I don't feel its worth the hassle and am not seeing any interference on the scope to indicate this is the issue BUT I'm no expert!
Do you have resistor type spark plugs?
hhhhmmmmm BP5ES not resistor plug, great pickup mate! I shall try work out some resistor plugs for it, was more concerned on heat rating overlooked the resistor! this could be it!
Just confirmed a few things;
Cam trigger definitely not required so I can throw that logic in the bin - not sure why I was convinced it made the difference early on. Tried suggestion of running with CAM sensor disconnected and issue still present. One thing I did observe though is that it seems perfect for the first 15-20 seconds from cold, is this luck or is my issue just getting warmed up? may be a clue.
Trigger type setting rising or falling - engine runs the same
Have to go to work now but ill play around with other ideas later on try work out a set of resistor plugs for it.
EDIT: funny checking original notes for the build i had bosch WR8DC+ as the plugs to go for but some reason changed to BP5s, NGK do a lovely iridium resistor type at this heat but there 30 bucks a piece might try the bosch first at 10 bucks a pop and confirm any issue.