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Mass airflow sensor?

Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. In this forum you'll find S40/V40-specific owners asking and answering questions on maintenance, ownership, repairs, tutorials and almost every do-it-yourself thing you can do to save money owning these Volvos.

1996 - 2004 S40
1996 - 2004 V40
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laurarefka
Posts: 1
Joined: 21 January 2025
Year and Model: 2003 S40
Location: Somerset, CO

Mass airflow sensor?

Post by laurarefka »

My 2003 Volvo S40 kept dying when I was traveling down the highway and when I would come to stop signs. Then it advanced to having difficulty idling. Now, it starts and runs fine, as long as I keep my foot on the accelerator, but as soon as I take my foot off the gas it dies. I am poor, so friends have been helping me, but no luck. I then read about the mass airflow sensor and think it might be the problem. What do you think?
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volvolugnut
Posts: 6233
Joined: 19 January 2014
Year and Model: 2001 V70
Location: Oklahoma USA
Has thanked: 927 times
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Post by volvolugnut »

Typical way to troubleshoot the mass airflow sensor is to unplug it and see if default flow settings will make engine start/run better.
volvolugnut
The Fleet:
Volvo: 2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple Volvo parts cars.
Mercedes: 2001 E320, 1973 280, 1974 280C, 1989 300E, 1988 300TE, 1979 300TD, parts cars.
2009 Smart Passion
Ford: 1977 F350, 1964 F150 (2), 1938 Tudor Sedan
Farmall tractors: 1956 400 Diesel, 1946 A
And others.
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