I have a sporadic lifter noise coming out of my 1.9 IDI. This can happen at any time, high speeds and or at idle and can last for a few seconds to much longer, but not minutes upon minutes. I've tries some of the readily available chemical fixes to no avail. My assumption is that it's a collapsed lifter. As I have a bunch of 1.6 lifters - does anybody know if the 1.6 lifters will interchange with the 1.9's?? Thanks.