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2017 Titan XD Rough Idle & P0304 Misfire

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Mike T. · rep 0 · May 25, 1:52 AM · 1 replies · solved · Question

Vehicle: 2017 Nissan Titan XD SL

Hello fellow Titan owners,

My 2017 Nissan Titan XD (5.6L V8 gasoline engine, not the Cummins diesel) has developed a really rough idle lately. It feels like the engine is shaking more than usual, and sometimes the Check Engine Light flashes, especially under acceleration, then goes solid. I scanned it and got a P0304 code, indicating a misfire in cylinder 4.

I'm at about 70,000 miles. What are the usual suspects for a P0304 on these Titans? Could it be a bad spark plug, coil pack, or something more serious like an injector? Any troubleshooting tips before I dive in or take it to the dealer?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:52 AM

0

ClearTheCode admin answer:

A P0304 code on your 2017 Nissan Titan XD indicates a misfire specifically in cylinder 4. A flashing CEL is serious, as it means active misfires are occurring and potentially damaging the catalytic converter. Addressing this promptly is important.

Common Causes for P0304:

  • Ignition System:
    • Spark Plug: A worn, fouled, or cracked spark plug in cylinder 4.
    • Ignition Coil: A failing ignition coil for cylinder 4, which is responsible for providing high voltage to the spark plug.
  • Fuel System:
    • Fuel Injector: A clogged, faulty, or leaking fuel injector for cylinder 4, leading to insufficient fuel delivery.
  • Engine Mechanical:
    • Compression Issue: Low compression in cylinder 4 due to worn piston rings, valve issues, or a blown head gasket.
    • Vacuum Leak: A vacuum leak near cylinder 4, though less common for a single-cylinder misfire, can affect air/fuel mixture.

Diagnostic Steps:

  1. Swap Components: The easiest way to diagnose is to swap components with an adjacent cylinder that isn't misfiring:
    • Swap Ignition Coil: Move the coil from cylinder 4 to, say, cylinder 2. Clear the code and drive. If the misfire moves to cylinder 2 (P0302), the coil is bad.
    • Swap Spark Plug: If the coil swap doesn't change anything, swap the spark plug from cylinder 4 to another cylinder. If the misfire follows, the plug is the issue.
  2. Check Fuel Injector: If coils and plugs are ruled out, the fuel injector is next. You can often listen to injectors with a mechanic's stethoscope to hear if they are clicking consistently. For a more definitive test, you could swap the injector (though this is more involved) or have its flow pattern tested.
  3. Compression Test: If all else fails, a compression test on cylinder 4 will reveal if there's an internal engine mechanical problem.

When to See a Shop:

  • If swapping components doesn't isolate the issue, or if you suspect a fuel injector or internal engine problem, it's time for a professional. They have specialized tools for injector testing and more advanced diagnostics for engine mechanical issues. Continuing to drive with a persistent misfire can cause costly damage to your catalytic converter.
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