I’ve had my car up on stands and all apart the past few weeks. I just got it back together, but now I have a loud knocking when I first start the engine. It sounds like someone knocking two pieces of wood together three times a second and lasts maybe 10-20 seconds then goes away. During this time, the engine idle speed is very low and erratic. After that it sounds normal and idles fine.
I also can see some smoke seeping out from under the number 6 exhaust port on the manifold. I don’t know if that is oil burning off or if I have a hole there. The car emits a slight haze of smoke at idle and it stinks so I assume the catalytic converter is no good.
I had a massive fuel leak from the fuel filter area the first few times I started it, but it appears to have gone away. I got under there and tugged and wiggled all the lines but it doesn’t leak anymore.
Has anyone else experienced these symptoms?