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1993 Volvo 940 Question: Stalling due to mass airflow sensor?

 

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TurboGirl66, 2.3L 4 Cylinder Turbo, Saint Paul, MN, February 20, 2011, 19:02
 Rookie

I recently had a turbocharger replaced, and noticed the engine light on when I picked up the car. I thought nothing of it since I figured the work engaged the light, and the car had been test-driven. It drove nicely and the mechanics know this car. A few days later, when accelarating up a snowy driveway, the car stalled. Never happened in 12 years. Started right up again. Same thing happened another night. Forgot about it until yesterday, car suddenly stalled while in motion, after accelerating. Started right up again. Went here and saw this airflow sensor issue come up! I always keep tank at least half full, but the fuel filter is due for replacement. 212K miles. Am I possibly looking at a mass airflow sensor? Thank you for any help! Total time frame with this issue is about 4 weeks.

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  • Answer #1

    overbys from Overbys Inc, February 21, 2011, 06:21
     Master

    you need to take the car back to the shop that replaced
    the turbo. you should have immediately take the car back
    due to the check engine light. assume nothing until they
    find out what codes are causing the check engine light.

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    VolvoNewbie, December 26, 2012, 01:21
     Rookie

    My Volvo began having a rough idle after I replaced the Power Stage after an almost complete thorough change-out of my volvo's ignition components, I've recently noticed a rough idle with my 940t after replacing the power amplifier (Power Stage/ignition module); then, the engine would continue its rough idle & stop. It did it shortly after replacing the power amplifier (Power Stage/ignition module) with a new aftermarket product.

    I did check the resistance specs for the ignition coil, and, yes, all were fine...

    I did disconnect the Mass-Air-Flow sensor connection, because I read somewhere that if the MAF is disconnected and the car starts, that the engine is in limp-back-home-mode. I did this, and it did start on my second attempt, and after re-putting on the Power Stage that I retrieved from the junk-yard as a tester & verification that the old unit (Power Stage/ignition module) was the culprit of the ignition problems that I was originally having with not being able to start my Volvo.

    My 1993 940 Turbo still has a difficult time starting, or if it does start, it will only stay running in idle for about 5 - 10 minutes. The new Power Stage that I purchased and mounted seems to have affected ECU functions and relay of sensors, fuel ratios, timing and firing functions.

    Do you have any further insight / suggestions about why exactly starting--and maintaining an idle--is not reliable, or the ignition firing is unreliable. My check engine light did only illuminate after disconnecting the MAF connection to the air intake, but not before disconnecting the MAF.

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