So i have recently purchased a 2001 Saab 9-5 knowing it had this knock. It is a consistent noise and it seems to be in the valve train below the Direct Ignition. I have replaced all of the lifters and it still made the noise, please help me. i have a recording of the noise if you want to email me at [email protected] i will be happy to send the file to you it might help. THANK YOU!!!