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benjamin_meier36

SM5 rough engine and check engine light

Hey, I've got a 2017 Renault SM5, gasoline engine, with 175k km on the clock. Lately, the engine's been running rough and the check engine light came on. It also jerks when accelerating and feels like it lost some power. Suspect it could be a defective injection valve. Anyone experienced something similar?

Summary of the thread

A 2017 Renault SM5 with 175,000 km is experiencing a rough engine, check engine light, jerking during acceleration, and power loss. The initial suspicion is a defective injection valve. A similar issue in another vehicle was resolved by replacing the ignition coil, but in this case, professional diagnostics confirmed the problem was indeed a faulty fuel injector, which was replaced to restore the car's performance.

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4 comment(s)

lea_hartmann1

Hey, that sounds familiar. I had similar symptoms with my old Opel Astra. Check engine light, poor throttle response and engine misfiring. Turned out to be the ignition coil. Have you checked yours?

benjamin_meier36 (community.author)

Interesting. I was leaning towards fuel injectors. How did you diagnose the ignition coil issue?

lea_hartmann1

Well, it was a process of elimination, but the garage confirmed it with some diagnostic tools. They checked the fuel injectors too but those were fine. Given your symptoms, it might be worth getting it checked professionally. Could be injectors, could be something else. Better safe than sorry.

benjamin_meier36 (community.author)

Thanks for the advice. Took it to the shop, and you were right, it was the fuel injector. 515€ later and it runs like new again.

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RENAULT

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SM5