Why does my Acura ZDX make a metallic ringing noise when I accelerate?

Short answer: Some ZDX owners hear a metallic ringing or pinging on medium throttle in 3rd to 5th gear, worse uphill. Dealers have called it engine pinging (knock, when fuel ignites too early). One owner later said higher-octane fuel plus a software update from a service bulletin fixed it. Other owners never had the noise. Persistent knock can damage an engine, so get it checked.

Symptom: A metallic ringing, tinny rattle or ping on light-to-medium acceleration in higher gears, louder on hills or with a load.

What to check first

1. Use the recommended premium fuel and see if the noise changes.
2. Ask an Acura dealer to check for software updates or service bulletins for your VIN.
3. Rule out a loose heat shield under the car, which can ring too.
4. Scan for knock sensor or misfire codes.
5. Check your VIN for open recalls.

Likely causes

1. Engine pinging (knock) on lower-octane fuel. Owners say higher octane helps.
2. Engine computer calibration. One owner said a software update fixed it.
3. Loose heat shield. A common source of metallic rattles.

What it usually costs

Owners in these threads didn't post costs. A software update is usually done by an Acura dealer.

Is it safe to keep driving?

Usually OK for short drives, but avoid hard acceleration while it pings. Long-term knock can damage pistons. Get it checked. Verify with a mechanic.

DIY or shop?

DIY for fuel changes and checking heat shields. Software updates are dealer jobs.

Recalls, bulletins and complaints in plain words

• No recall for this noise: NHTSA's ZDX recalls are for air bags, such as Takata inflator recalls (18V042, 19V502). Check your VIN at nhtsa.gov/recalls or with an Acura dealer. If your car is part of a recall, the dealer fixes it for free.
• NHTSA complaints: 2 keyword-matched complaints for Acura ZDX 2010–2013 (of 12 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-22; keywords: ping, knock, ringing, rattle, metallic, noise). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In Metallic ringing noise on acceleration - ZDX on Acurazine, a 2010 ZDX owner heard ringing on medium throttle in 3rd to 5th gear, worse uphill. The dealer said it was engine pinging, and an Acura field engineer found nothing. Members said 2010–2011 MDX owners heard it too. A 2018 post said 94 octane fuel plus a computer update from a service bulletin fixed it.
• In Al Can potential pinging issue on Acurazine, the same owner said Acura had no fix yet in 2011 and octane booster didn't help. Other ZDX owners said they never heard it.

Quick tip

If a car pings, try a tank of top-tier premium first. If it still pings, that's a dealer visit.

Vehicle focus: 2010–2013 Acura ZDX (3.7L V6). Similar reports exist for 2010–2011 MDX.

Safety / mechanic note

Ongoing engine knock can cause engine damage. Verify with a mechanic.