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2020 S60 T5 Rough Idle and Stalling at Stops

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Jason D. · rep 0 · May 22, 5:13 AM · 1 replies · solved · Question

Vehicle: 2020 Volvo S60 T5 Momentum

Hey everyone, I'm having a really frustrating issue with my 2020 Volvo S60 T5 Momentum. Lately, it's developed a rough idle, especially when I'm stopped at a light or in traffic. Sometimes, it even feels like it's going to stall, and it has actually stalled a couple of times.

It seems to happen more frequently after the engine has warmed up. There's no check engine light on yet, which is making it hard to diagnose.

The car has about 60,000 miles on it and has been regularly serviced. I've checked the basic fluid levels, and everything seems fine.

Has anyone experienced something similar with their S60 or another modern Volvo? Any ideas on what could be causing this or what I should check first before taking it to the dealer? Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:13 AM

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ClearTheCode admin answer:

Experiencing a rough idle and stalling in your 2020 Volvo S60 T5 can be concerning, especially without a Check Engine Light (CEL). Here are some steps and potential causes to investigate:

  1. Check for Pending Codes: Even without an active CEL, your car's Engine Control Unit (ECU) might have stored pending diagnostic trouble codes (DTCs). Use an OBD-II scanner to check for codes like P030x (misfire in a specific cylinder), P0171/P0174 (lean condition), or P0101 (Mass Air Flow sensor performance issue). These can provide valuable clues.

  2. Inspect Ignition System Components: Worn spark plugs or failing ignition coils are common culprits for rough idle and misfires. Given your 60,000 miles, if the spark plugs haven't been replaced recently, they might be due. A failing coil can cause intermittent misfires that worsen with engine heat.

  3. Fuel System Assessment:

    • Fuel Injectors: Clogged or dirty fuel injectors can lead to an uneven fuel-air mixture, causing a rough idle. Fuel system cleaner might offer a temporary fix, but a professional cleaning or replacement might be needed.
    • Fuel Pressure: Low fuel pressure, possibly due to a failing fuel pump or a partially clogged fuel filter, can starve the engine of fuel, leading to stalling. This often doesn't trigger a CEL immediately.

  4. Air Intake System & Vacuum Leaks:

    • Mass Air Flow (MAF) Sensor: A dirty or faulty MAF sensor can send incorrect air intake readings to the ECU, leading to an improper fuel-air mixture. Try cleaning it with a specialized MAF sensor cleaner.
    • Vacuum Leaks: Inspect all vacuum lines, intake manifold gaskets, and PCV (Positive Crankcase Ventilation) system components for any cracks or leaks. Unmetered air entering the engine can cause a lean condition and rough idle.

When to See a Shop: If basic checks don't resolve the issue, or if a CEL does illuminate, it's crucial to take your Volvo to a qualified technician. They have specialized diagnostic tools (like Volvo's VIDA system) that can perform in-depth diagnostics, read specific sensor data, and identify issues that generic OBD-II scanners cannot. Continued driving with a persistent rough idle or stalling can potentially lead to further engine damage or catalytic converter issues.

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