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When doing cold starts engine makes like a rattling or tapping noise

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At cold starts could the alternator or the Canister Purge Solenoid make a rattling or a tapping noise? Every time I start my regal at cold starts the engine makes a rattling taping noise. I tried to listen with my ear and it seems to be coming from between the alternator and Canister Purge Solenoid. It never done that before. Only after I replaced the alternator it started doing that. The alternator is charging good because I checked it and got good readings. I am thinking it is the solenoid. Is the solenoid bad or designed to do this at idle?

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