17-01-2014, 08:11 PM
Yes spark plugs will help a bit I've had loads of 106s come in and fail and we have done every thing you have and then change the plugs and it made it pass but one thing I would say it you have to rag the shit out of them get the cat glowing almost red lol and then they pass do you have access to any plug in tools to read the live data on the lambda sensor