My 2001 GTP makes a fairly loud ticking noise when it's first started. My first thought was lifter noise, but it seems to go away after the car warms up. Could it be an exhaust leak that goes away after the engine and exhaust get warmed up?
Cold start rattles are a rarity with these engines, particularly in stock configuration. A bleeding lifter, or exhaust leak are possible. Piston slap is also a possibility.
I recommend having a professional observe this noise, as the above scenarios are time consuming to diagnose. An adept engine tech may be able to identify the noise quickly, and make some recommendations.
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