PlayDate
Well-Known Member
Thanks for the videos. I realize that it might be difficult to hear but I believe something is amiss in the valve train. Given the history of these engines.....what you are experiencing looks like valves not closing/sealing and it looks like more than one on the port engine. It wouldn't necessarily show up in a static compression check. With fuel and spark stabilized unfortunately it is the only thing left that shows up at 3,000+ rpms.
I would see the same thing in race cars if the valve springs were not strong enough the valves would start to float and the engine would fall off at higher rpms and not recover until the rpms were reduced.....then you could replay the story again (over and over).
It also fits the popping. I would swap the ecms but if that fairs no better.....it is probably mechanical.
I would see the same thing in race cars if the valve springs were not strong enough the valves would start to float and the engine would fall off at higher rpms and not recover until the rpms were reduced.....then you could replay the story again (over and over).
It also fits the popping. I would swap the ecms but if that fairs no better.....it is probably mechanical.