sarah_johnson1

Mercedes ML hybrid combustion misfires diagnosis

My 2010 Mercedes ML hybrid exhibits combustion misfires I'm experiencing rough engine running check engine light illumination acceleration jerking and diminished engine power Diagnostics suggest a defective injection valve or injector Cylinder misfire is suspected Ignition coil functionality seems normal Is there an alternative explanation

4 comment(s)

Rough idle and jerking point to fuel delivery Did you check the fuel injector harness for loose connections It could also be a vacuum leak affecting throttle response Have you tried any fuel injector cleaner

The harness appears intact Vacuum integrity tests passed Fuel injector cleaner yielded no improvement Could a faulty sensor mimic these symptoms perhaps compromising fuel mixture

A sensor issue is possible but less likely given the misfire code It's pointing pretty directly at a fuel injector problem Given the diagnostic work you've already done would you agree a workshop visit for injector replacement and a proper diagnosis is warranted

Your assessment aligns with my conclusion Workshop confirmed a defective fuel injector on cylinder four Replacement priced at 515€ rectified the issue Thank you for your counsel

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