Kent: If the knock or taping noise is in fact a piston pin, what is likely to happen if I keep driving the car. I just returned from a 360 mile trip and the noise has not changed. I pulled the pre-chamber and inspected with a boar scope to no avail. I also installed a different tested injector but no noticeable change. The knock is not real loud or deep as I believe a rod would make. It cannot be heard above 2400. Most noticable at around 2100 pulling under load. Thanks for your opinion.
Nate Buchanan