I guess as a precaution, I will wrap the wrench and line in a large thick rag. It is hard to imagine that just one injector coulkd make such a ruckus. When I start the car in the morning it is very much more quiet, but once I hit the accelerator, the noise increase and does not stop. It is really only noisy at idle, once I hit the gas
the car is as quiet a gas 300.