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2017 Malibu Stalling at Stops, Hard to Restart

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Chris P. · rep 0 · May 22, 2:31 AM · 1 replies · solved · Question

Vehicle: 2017 Chevrolet Malibu LT

My 2017 Chevrolet Malibu LT (2.0L Turbo) has developed a really frustrating problem. It keeps stalling out when I come to a stop, like at a red light or stop sign. It doesn't always happen, but it's becoming more frequent.

After it stalls, it's often hard to restart. I have to crank it for a while, and sometimes give it some gas, before it finally catches. There's no Check Engine Light on right now, which makes it even harder to diagnose.

What could be causing this kind of intermittent stalling and hard start issue without any codes showing up? I'm worried about it happening in traffic.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:31 AM

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Intermittent stalling and hard starting on your 2017 Chevrolet Malibu LT, especially without a Check Engine Light, can be particularly challenging to diagnose. However, several common culprits often lead to these symptoms.

Here are the primary areas to investigate:

  1. Fuel Delivery System:

    • Fuel Pump: A failing fuel pump can cause inconsistent fuel pressure, leading to stalling when the engine demands more fuel (like when coming to a stop and then accelerating) and difficulty restarting. Listen for the fuel pump priming sound when you turn the key to the 'on' position.
    • Fuel Filter: A clogged fuel filter restricts fuel flow, which can starve the engine, especially under load or during transitions. While less common on newer vehicles with 'lifetime' filters, it's still a possibility.
    • Fuel Pressure Regulator: A faulty regulator can cause incorrect fuel pressure, leading to either a rich or lean condition that results in stalling.
    • Action: Check fuel pressure at the rail during operation and when the issue occurs. Low or fluctuating pressure points to a fuel delivery problem.

  2. Idle Air Control (IAC) Valve / Throttle Body:

    • Cause: While many modern vehicles use electronic throttle bodies without a separate IAC valve, a dirty or faulty throttle body can cause idle issues and stalling. Carbon buildup can restrict airflow at idle.
    • Action: Inspect and clean the throttle body. If your vehicle has an IAC valve, check its operation.

  3. Crankshaft Position Sensor (CKP Sensor):

    • Cause: This sensor tells the engine's computer the position of the crankshaft, which is crucial for fuel injection and ignition timing. A failing CKP sensor can cause intermittent stalling and no-start conditions, often without setting a code immediately.
    • Action: While difficult to test without specialized equipment, this is a common failure point for these symptoms. A professional diagnostic scan might reveal intermittent signal loss.

  4. Battery and Charging System:

    • Cause: Although less likely to cause stalling while driving, a weak battery or failing alternator can lead to low voltage issues that affect engine sensors and the ECU, potentially causing erratic behavior and hard starting.
    • Action: Have your battery and alternator tested to ensure they are providing adequate voltage and current.

When to See a Shop: Given the intermittent nature and lack of codes, a professional diagnosis is highly recommended. A mechanic can perform a comprehensive scan for pending codes, monitor live data from various sensors during a test drive, and conduct specific tests (like fuel pressure or sensor signal checks) that are difficult to do at home. This will help accurately pinpoint the cause of the stalling and hard start.

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