Alfa Romeo 156 2017: Cold Start Engine Noise
A rattling or ticking noise from the engine compartment on cold start in your Alfa Romeo 156 2017 is often due to low oil pressure or a worn timing chain tensioner, common in this model's Twin Spark engines.
Diagnosis Details
Possible Causes
Worn timing chain tensioner or guides: The 2017 Alfa Romeo 156's Twin Spark engine is known for timing chain issues, especially on cold starts when oil pressure is low, causing a rattling noise.
Low engine oil level or viscosity: Insufficient oil or using the wrong grade (e.g., too thick) can cause hydraulic lifters to not pressurize quickly, leading to ticking on cold start.
Exhaust manifold leak: A small crack or gasket leak can create a ticking sound that is more noticeable when the engine is cold and metal contracts.
Related OBD-II Codes
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What You Should Do
First, check your engine oil level and condition; top off if low and ensure you're using the recommended 5W-40 synthetic oil.
If the noise persists, have a mechanic inspect the timing chain tensioner and guides, as this is a known weak point on the Alfa Romeo 156 Twin Spark engine.
Avoid prolonged driving if the noise becomes louder or the check engine light comes on.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
