Engine knock or valves?? Need help
Just put a 2zz in my 2000 GT. Installed complete motor and transmission with 67k original miles (setting for at least a year).
Motor started right up and seemed to run smooth. I noticed a little valvetrain noise. Shortly afterwards, it seems like there is a knocking when I start pulling out. Once I pass about 2000rpm, the noise is completely gone. When I pull out at an intersection, the knock appears again. Not sure if it is valves or rod knock. It seems louder when it is warmed up.
Changed oil and added Lucas oil treatment and still have no difference.
It never makes any noise above 2000rpm.
Motor runs smooth and consistent all the way to redline with plenty of power.
Can anyone help determine what the issue is? Tried gas and gas additives. It does not appear to be a "pinging" knock, but more like a metal knock.
I can record the noise with my phone, but not sure how to post it to listen.
2000 Celica GT daily driver 100 miles/day round trip.