Why does my Nissan Armada tick on a cold start and then go quiet?

Short answer: A tick or tap on a cold start that fades as the engine warms up is very often a cracked exhaust manifold on the Armada's 5.6 V8. The exhaust manifold is the heavy pipe that collects exhaust from each cylinder. The crack leaks when cold and closes up as the metal heats and expands, which is why the noise goes away. Owners find it by looking from underneath or having the heat shields removed.

Symptom: A ticking or tapping noise for the first few minutes after a cold start, louder when accelerating or next to a wall, that fades once warm.

What to check first

1. Listen on a truly cold start, ideally next to a wall or garage door so the sound bounces back.
2. Look from underneath for black soot streaks on the manifolds near the cracks.
3. Ask a shop to remove the heat shields if you can't see it.
4. Read any codes. Lean codes such as P0171 or P0174 can show up as a leak gets bigger.

Likely causes

1. Cracked exhaust manifold. Club Armada owners describe a tick that fades as the crack seals when hot.
2. Broken or loose manifold bolts or gasket. A leak at the manifold joint can make a similar cold tick.

What it usually costs

I couldn't find a reliable published price. It depends on whether one or both manifolds need replacing and whether bolts break during removal.

Is it safe to keep driving?

Usually yes in the short term, but an exhaust leak can let carbon monoxide (an odorless poisonous gas) into the cabin. If you smell exhaust inside, get it fixed right away. Verify with a mechanic.

DIY or shop?

Shop for most people. Manifold replacement on this V8 is tight work with rusty bolts that can snap.

Recalls, bulletins and complaints in plain words

• No recall covers cracked exhaust manifolds on the Armada.
• Recall 10V517 (2004–2006 Armada and other Nissan trucks): a separate engine computer relay can develop deposits on its contacts. Dealers replace the relay. If your truck is part of this recall, the dealer fixes it for free.
• NHTSA complaints: 57 keyword-matched complaints for Nissan Armada 2004–2015 (of 1,527 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-17; keywords: exhaust manifold, manifold, exhaust leak, ticking, tick, exhaust fumes, exhaust smell).

What owners report

• Club Armada has many owner threads on this, including Exhaust manifold cracked and a warning thread, Exhaust manifolds cracked, heads up to those with under 80k miles. Owners describe a cold-start tick that goes away as the engine warms.
• Members also shared how to check for a cracked manifold visually and exhaust manifold leak videos so others could compare the sound.

My take

My advice as a former pre-purchase inspector: always ask to start a used truck cold. A warmed-up Armada on the lot can hide a cracked manifold completely.

Vehicle focus: 2004–2015 Nissan Armada with the 5.6L V8.

Safety / mechanic note

Exhaust leaks can let carbon monoxide into the cabin. Verify with a mechanic.