My 300D has developed a rather scary intermittent knock that sounds like a gasser spark knock. It does it occasionally on acceleration, occasionally on deceleration, I never hear it while cruising or at idle. If I punch the accelerator at idle sometimes I can hear it "crack" but not every time.

Could someone please tell me how to diagnose this knock whether it is injector related or internal (piston, rod, wrist pin). Other than hearing this ominous sounding intermittent knock the car runs smooth and has lots & lots of power. No smoke.

I just recently set the IP timing. It was at 15deg BTDC and now she is at 23deg BTDC. I never heard this knock until I set the IP timing. Also, the chain is only two months old so I guess that could be ruled out. I have replaced the delivery valve seals in the IP and torqued them to specs. The car started this on Friday while in route to the ATL airport. I left it sitting in the parking garage for four days. It fired up just fine when I returned, no smoke, no knocking. I had her towed home just to be safe but I am a tad bit leary of driving her until I know how to narrow down what the noise MIGHT be. Any suggestions?

1980 300D

Kevin