Engine ticking permanently after hard acceleration

Originally Posted by barncobob

maybe gas related? id drive with old gas and fill up at a station(top tier) that is busy to get fresh gas,,,,,or drain oil with something other than whats in there,,just a thought..

Originally Posted by jaedub

How violent is the knock? Does it only occur during idle/soft acceleration? Does the knock stop if you press down on your clutch during idle? (If you have MT)

Originally Posted by SouthArk370Z

If it's a "light" tick, probably normal. I'd try barncobob's suggestion and put some fresh gas in the tank. If that doesn't help, I'd try the Nissan ester oil - it's supposed to quiet the noisy Z valve train.

If it's more like a knock, I'd get a mechanic to look at it ASAP.

Originally Posted by Dreadnaught

When I first bought my Z I heard a slight ticking noise coming from under the hood at the rear of the right cylinder head. I thought I had a valve train issue until I discovered it was the purge control valve letting in fuel vapor into the engine from the fuel tank. At idle it sounds in rhythm with the RPM's. When you hear the noise open the hood and see if the noise is coming from the rear of the right cylinder head. If so, turn the engine off, then start it again and see if the noise goes away. I noticed if you shut the car off if the purge control valve is ticking/operating and start the engine the purge control valve shuts off.