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Ticking Noise from Engine - 2017 Ram 2500 6.4L Hemi - Exhaust Manifold?

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Mike T. · rep 0 · May 22, 3:38 AM · 1 replies · solved · Question

Vehicle: 2017 Ram 2500 Laramie

Hi all,

I've noticed a distinct ticking noise coming from the engine bay of my 2017 Ram 2500 with the 6.4L Hemi. It's most noticeable on cold starts and seems to quiet down a bit once the engine warms up, but it never fully goes away. It sounds like it's coming from the passenger side.

I've read online that this is a very common issue with Ram Hemi engines, often related to broken exhaust manifold bolts causing an exhaust leak. Is this true? What are the long-term implications if I don't get it fixed right away?

My truck is a 2017 Ram 2500 Laramie, and it has about 85,000 miles on it. Has anyone dealt with this specific problem? What was your experience with the repair, and what was the cost like? Any advice on confirming it's the manifold bolts would be great.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:38 AM

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ClearTheCode admin answer:

The ticking noise you're describing in your 2017 Ram 2500 6.4L Hemi is indeed a very common issue, almost a characteristic, of these engines. It is highly probable that you are experiencing an exhaust manifold leak due to broken or stretched exhaust manifold bolts.

  1. Confirm the Diagnosis: The best way to confirm is a visual inspection. Look for black soot stains around the exhaust manifold gasket area, especially near the cylinder head. You might also hear the ticking become louder if you rev the engine slightly while someone listens carefully near the manifold. A mechanic can also perform a smoke test to pinpoint the leak.
  2. Causes: The primary cause is the design of the exhaust manifold bolts and the expansion/contraction cycles of the cast iron manifold and aluminum cylinder head. Over time, the bolts fatigue, stretch, and eventually break, creating a gap for exhaust gases to escape, causing the ticking sound.
  3. Long-Term Implications: While not immediately catastrophic, an exhaust leak can lead to several issues:
    • Reduced Engine Performance: Especially if the leak is significant and affects oxygen sensor readings.
    • Increased Emissions: Unmetered air entering the exhaust can throw off the air-fuel ratio.
    • Potential for Check Engine Light: Although less common for minor leaks, a persistent leak could eventually trigger codes like P0420/P0430 (Catalyst System Efficiency Below Threshold) if the O2 sensors are affected.
    • Annoyance: The ticking sound itself can be quite irritating.
    • Damage to Other Components: Prolonged exposure to hot exhaust gases leaking onto nearby components can cause premature wear.
  4. Repair Process: The repair typically involves removing the exhaust manifold, extracting the broken bolts (which can be challenging if they're seized or broken flush with the head), and installing new, often upgraded, stainless steel bolts and new gaskets. Some owners opt for aftermarket manifolds that are less prone to warping.

When to See a Shop:

  • As soon as you confirm the ticking is from an exhaust leak. While not an emergency, addressing it prevents potential secondary issues and restores engine efficiency.
  • If you notice any performance degradation or a Check Engine Light illuminates, it's crucial to get it checked promptly.
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