(THIS IS A REPOST AS THE LINK I HAD DIDN'T WORK LAST TIME)
Hi, I have this 1978 Holden Kingswood with a Straight 6 202 3.3L motor, 3 spd auto. At higher engine RPM (whether driving or in park) I get a light rapid tapping sound and then an abrubt tick (please listen to the audio below). I want to know is this sound engine detonation, pinking, etc. I am currently using a tank that has about 30 litres of 98 fuel octane and about 40 litres of 95 octane fuel and set to 6 degrees BTDC on timing, but from memory- it did it on a pure tank of either fuel. I am also using a lead replacement additive. Does this sound like pinking? It also did it on 3 degrees BTDC timing too.
Turn up your headphones, speakers etc. and you should be able to hear it over the engine revving.
https://www.youtube.com/watch?v=ZHDDNYLoFpE
The timing might be off of tad but it isn't very loud of a noise it's not pissed around knocking maybe the valve timing is a little bit off
Can this be corrected? I am still new to cars, but I understand that my engine has hydraulic valves that can't be adjusted. What would you suggest?