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romyfire9

Mustang rough idle and power loss

I've got a 2020 Ford Mustang, gasoline engine, with about 53k km on it. Lately, it feels like it's lost power, the check engine light is on, and the engine runs pretty rough. It also jerks when I accelerate and sometimes even stalls at idle. I'm thinking it might be fuel related, but I'm not sure where to start.

Summary of the thread

A 2020 Ford Mustang with 53,000 km is experiencing rough idling, power loss, and stalling, with the check engine light on. The initial suspicion is a fuel-related issue. Possible causes include spark plug problems, a vacuum leak, or a defective fuel injector. After professional diagnosis, the issue is confirmed to be a defective fuel injector, which is replaced, resolving the problem.

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4 comment(s)

thomasflame6

Sounds like a mixture preparation error. Have you checked the usual suspects like spark plugs or the throttle body? Could also be a vacuum leak in the intake manifold causing it to run lean. When was the last time the spark plugs were changed?

romyfire9 (community.author)

I haven't checked the spark plugs yet, to be honest. I was kind of hoping it wasn't something that simple. A vacuum leak seems plausible though. How would I go about checking for that?

thomasflame6

A vacuum leak can be tricky. Sometimes you can hear a hissing sound. As for the plugs: Given the mileage and symptoms, I'd say get it to a workshop. The injectors might be defective, causing a rich mixture and potentially damaging the catalytic converter. Could also be a faulty sensor messing with the fuel mixture. Best to get it diagnosed properly before things get worse.

romyfire9 (community.author)

I appreciate the advice. I took it to the shop, and you were right – it was a defective fuel injector. Total cost was 515€. Runs like new again.

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FORD

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MUSTANG