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[jayman]

I used to have a 2000 GMC Sierra with a Vortec 5.3 V8. Cold start - even summer - it would knock like a diesel. Those motors were infamous for having knocking noises. GM did s*** about it too, claimed it was a "normal" noise. They also claimed 1 litre of oil every 800km was normal

My FJ used to make the "ticking" noise until I followed the steps suggested in this forum and isolated that emission valve on the driver side of the motor. Now my motor is VERY quiet, cold or hot

Take it in, and have them listen to it. If possible, have them listen to the cold start too, then as others have suggested, try another FJ and compare the difference in noise