Well I never thought I'd be asking questions about lifters but here goes. On Monday we started my lads Ecotec and it sounded like someone was under the bonnet hitting a hammer on the engine. It did this for about a minute and then suddenly went quiet as to how it should be. We drove into the city and parked it and came back about two hours later and it started again perfectly normal. This engine has been a very good solid quiet performer with no issues to date. Now today (Wednesday) we started it again and Hammer time started again, but this time it went on for much longer but eventually it shut up and went back to normal. Again we parked it in the city and came back around two hours later only to have Hammer time return at full pelt. This time it took quite some time to quieten down and the engine was ticking lightly most of the half hour drive home. It was totally quiet by the time we got home. Now I'm somewhat perplexed at what's going on here as the scenario is getting worse and not better. I'm not sure if this is a lifter not pumping up due to a blockage or more so a lifter not holding pressure. My theory is the latter but thought I'd throw this out there amongst everyone and get your thoughts. Regardless I feel this is a valley out and remove the offending lifter and replacing it as it'll end up creating a burnt valve in the end. Cheers.