I have a 2006 impala with the new 3.5 liter engine
the car has about 45000 km on it
When the enige warms up I can hear a ticking or claking sound from somewere in the engine bay
the dealer replaced the selenoid purge vale but the sound is till there though muffled
It does not start till the engine is warm and the car is at idle then it continues like water torchuer tick tick tick
but not when cold-- then its quiet ? any ideas ?