emmalehmann7

Mercedes GLS engine stalling problem solved

My 2017 Mercedes GLS with a gasoline engine has the check engine light on at 183258 km The code points to an air valve issue and I'm getting engine stalling especially when cold and a rough idle Is this likely a vacuum leak somewhere like a defective hose connection from the pump to the valve I've checked the obvious hoses but found nothing glaring

A 2017 Mercedes GLS was experiencing engine stalling, rough idle, and a check engine light, with a diagnostic code indicating an air valve issue. The problem was suspected to be a vacuum leak, potentially from a defective hose connection. After inspecting the hoses, a cracked hose causing the vacuum leak was identified and replaced, resolving the stalling and idle issues, and clearing the check engine light.

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4 comment(s)

I understand your frustration I had a similar experience with my older Volvo The symptoms you describe strongly suggest a vacuum leak Have you inspected all the vacuum hoses thoroughly paying close attention to any cracks or brittleness

I checked the hoses visually but how can I be absolutely sure it's a vacuum leak Are there any tricks to pinpoint the exact location without tearing everything apart

Pinpointing a vacuum leak can be challenging without specialized equipment The hose connection from pump to valve is a very plausible cause In my case the problem was similar To avoid further complications I would recommend consulting a qualified workshop

It was exactly what I suspected a cracked hose causing a vacuum leak to the air valve I replaced it for 175€ and she's purring Check engine light's gone idle's smooth and no more stalling Thanks for confirming my suspicions

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MERCEDES

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GLS