S55 Engine Exhaust Camshaft Realignment - Fixing the Notorious Cold Start Ticking

If you own a BMW M2 Competition, M3 (F80), or M4 (F82/F83) and have noticed an annoying ticking or tapping noise from the engine bay during cold starts, you're not alone. This is a well-documented issue with the S55 engine that affects many owners.

The good news? It's completely fixable with our professional exhaust camshaft carrier realignment service.

BMW M4 F82 - One of the models affected by the S55 camshaft carrier issue

The Problem: Cold Start Ticking Noise

What Does It Sound Like?

Owners typically describe the noise as:

• A distinct ticking or tapping sound from the top end of the engine
• Most noticeable immediately after cold start
• Becomes more apparent as engine RPM returns to normal idle speed (around 800-1000 RPM)
• Predominantly heard from the driver's side of the engine bay
• The noise usually disappears when the engine warms up, but in some instances if left unresolved for too long, it can be heard at all times

Which Models Are Affected?

This issue affects S55-powered BMW models, including:

• BMW M2 Competition (F87)
• BMW M3 (F80) - 2014-2018
• BMW M4 (F82 Coupe / F83 Convertible) - 2014-2018

The Root Cause: Exhaust Camshaft Carrier Misalignment

The ticking noise is caused by misalignment of the exhaust camshaft carrier. Over time and through thermal cycling (heating and cooling of the engine), the camshaft carrier can shift slightly out of its optimal position.

This misalignment affects the valve train geometry, causing:

• Inconsistent valve lash (clearance)
• Increased mechanical noise during cold operation
• Potential for accelerated wear if left unaddressed

The noise itself doesn't indicate catastrophic engine failure, but it's an annoyance and can lead to increased wear over time. Many owners find it concerning and want it resolved.

Book Your S55 Camshaft Realignment

If your BMW M2 Competition, M3, or M4 is suffering from the cold start ticking noise, don't let it continue. Our camshaft carrier realignment service will restore the silent, smooth operation you expect from your M car.

Contact Us to Book Your Service