jonathan_hofmann1
Corsa high fuel consumption and stalling
Summary of the thread
A 2014 Vauxhall Corsa with a gasoline engine is experiencing high fuel consumption, occasional stalling at idle, and the check engine light is on, accompanied by smoke during hard acceleration. These symptoms suggest a potential issue with the mass air flow (MAF) sensor, which can cause incorrect air-fuel ratios leading to increased fuel consumption and smoke due to incomplete combustion. Cleaning the MAF sensor with a specialized cleaner might temporarily resolve the issue, but replacement is recommended for a long-term solution, which ultimately resolved the problem.
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4 comment(s)
jonathan_hofmann1 (community.author)
I haven't tried cleaning it yet. Where is it located, and is there anything special I should use to clean it? Also, if it's the MAF, would that also explain the smoke I'm seeing on acceleration?
josephsilber12
The MAF sensor is usually located in the intake ducting, right after the air filter box. You'll need a special MAF sensor cleaner – don't use anything else! As for the smoke, yes, a faulty MAF can definitely cause that. The incorrect air/fuel mixture can lead to incomplete combustion and thus smoke, which I am sure is not a fog but rather a sign that unburned fuel is being expelled. Given the mileage and those combined symptoms, it may be time for a new MAF. For peace of mind and a precise diagnosis, I'd suggest a reputable shop.
jonathan_hofmann1 (community.author)
Thanks for the insight! Seems like a trip to the shop is indeed in order. Replaced the mass air flow sensor for 365€. Runs like new now.
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VAUXHALL
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CORSA
josephsilber12
Sounds like a classic case of a failing mass air flow (MAF) sensor, or LMM as you called it. The symptoms you are seeing all point to that. Higher fuel consumption happens because the engine computer isn't getting correct data about how much air is entering the engine, so it messes up the air-fuel ratio. Check engine light is another big clue. Out of curiosity, have you tried cleaning the MAF sensor yet? Sometimes that can resolve the issue temporarily.