I don't think it's injectors as the noise is more metallic and the car has developed vibration at idle which I think could be transmission mount. I'm beginning to think the two maybe related but not certain, never came across this type of noise problem on a car before. But stumped at the moment, I will change the transmission mount and hope for the best, just hoped someone else has had the same problem.
Recently had a similar issue on my daughter's Civic. Turned out to be a heat shield that had come loose between the exhaust and floor pan. But it "ticked". A squeeze underneath with a spanner cured it.
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