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2023 Integra 1.5T - Intermittent Rough Idle and Stalling at Stops

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Mike T. · rep 0 · May 25, 3:40 AM · 1 replies · solved · Question

Vehicle: 2023 Acura Integra A-Spec CVT

Hey everyone,

I've got a relatively new 2023 Acura Integra A-Spec with the 1.5T engine, only about 15,000 miles on it. For the last couple of weeks, I've been experiencing an intermittent rough idle, especially after the car has warmed up. It's not constant, but sometimes when I come to a stop, the RPMs will dip low, and the engine feels like it's struggling to stay on. A couple of times, it has actually stalled completely when I put it into park or neutral.

No check engine light yet, but it's really concerning for such a new car. I've tried using premium fuel, but it hasn't made a difference. Could this be related to fuel injectors, the idle air control valve (if it even has one), or something with the turbo system? Any thoughts or similar experiences with the 1.5T?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:40 AM

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ClearTheCode admin answer:

Intermittent rough idle and stalling on a new 2023 Acura Integra 1.5T is definitely not normal and warrants immediate attention. While the 1.5T engine is generally reliable, these symptoms point towards an issue affecting air, fuel, or spark delivery.

Possible Causes:

  1. Fuel System Issues:
    • Contaminated Fuel: While less likely with premium fuel, a bad batch of fuel could cause issues.
    • Fuel Injector Problems: A partially clogged or failing fuel injector could lead to an inconsistent air/fuel mixture, especially at idle.
    • High-Pressure Fuel Pump (HPFP): Issues with the HPFP could lead to insufficient fuel pressure.
  2. Ignition System:
    • Spark Plugs: Though new, a faulty spark plug or ignition coil could cause misfires, leading to rough idle.
  3. Air Intake/Vacuum Leaks:
    • Intake Leaks: Even small vacuum leaks can disrupt the air/fuel ratio, especially at idle.
    • Mass Air Flow (MAF) Sensor: A dirty or faulty MAF sensor can send incorrect air readings to the ECU.
    • Throttle Body: A dirty or malfunctioning electronic throttle body could cause erratic idle.
  4. PCV System: A faulty PCV valve or hose could create a vacuum leak or affect crankcase pressure.

Recommended Steps:

  1. Check for Codes: Even without a Check Engine Light, use an OBD-II scanner to check for any pending or stored Diagnostic Trouble Codes (DTCs), such as P030x (misfire codes) or P0171/P0172 (lean/rich condition).
  2. Inspect Air Filter: Ensure the air filter is clean and properly seated.
  3. Visual Inspection: Look for any loose or disconnected hoses in the engine bay, especially around the intake manifold and turbocharger.
  4. Fuel System Cleaner: Try a reputable, high-quality fuel system cleaner (e.g., Techron, Red Line SI-1) in a full tank of premium fuel. This might help with minor injector clogs.

When to See a Shop:

  • Immediately: Given the car is new and stalling is occurring, it's best to have it professionally diagnosed. Stalling can be a safety hazard.
  • An Acura dealership is the best first stop, as your vehicle is under warranty. They have specialized diagnostic tools and can check for any relevant Technical Service Bulletins (TSBs) or software updates for your specific issue. They can perform comprehensive tests on the fuel system, ignition, and air intake components to pinpoint the exact cause.
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