Question about 1999 Volvo V70

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Lambda Sensor or Air Mass Meter?

Engine starts very difficult and runs really bad. I think it's ether the Lamda Sonde sensor or the Air Mass Meter. The other strange thing is that the cooling fan starts to run straight away after you start the car and keeps running after the engine has stopt like the engine is hot. Does that mean it is probably the Lambda Sonde?

Kind regards,
Dethmer

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  • volvoforlife Sep 19, 2008

    THANKS 1 Volvoman! I finally got to changing the temperature sensor. And yep, all problems solved! Runs like a beauty again. Thanks again I'm a new member but I think this site is great!

  • mick838 Dec 06, 2008

    We have a 1998 Volvo V70 T (250,000kms). Engine stumbled to a stop whilst driving. Attempted restarting with no success, ocassionally starts but runs rough - rich, then stalls. Initially suspected a faulty M.A.P sensor - (if there is one fitted??) but could be related to the temp switch fault as mentioned here. Some advise will be greatly appreciated.

    Regards,
    Mitchell

  • Anonymous Mar 17, 2014

    the car turns on, then shuts off. then wait a while. then it will start and do the same thing. a mechanic had a meter on it, and it diagnosed , bad o2 sensors.do you think if i had them both changed that would do the trick?

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Replace the temp sensor in the thermostat housing behind alt(2 wires)

Posted on Aug 26, 2008

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Symptoms of faulty air flow sensor


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    Jul 09, 2016 | Cars & Trucks

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    Restricted perfomance dash message


    this warning can be flagged by lots of reasons you really need to get the fault codes out of the engine control module but the common causes i have found after working on these cars for a few years are air leaks after the mass air flow sensor, sticking throttle butterfly in the throttle body, the throttle itself, lamda sensors, and knock sensors, and because the temp gauge does not give you a true temp reading the engine could be overheating the clue to that is the rad fan always running

    Apr 19, 2013 | 2001 Jaguar XJ8

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    My 1991 240DL volvo has a hard start, and while idling, goes up and down, then eventually stalls out. The air flow sensor/air mass meter? was unhooked, and the car idled smoothly. Is it true that the car...


    When you unplug the mass airflow sensor, the car goes into "limp home" mode in which it runs full rich. Generally speaking, if a car runs better with the mass airflow sensor unplugged than with it plugged in, the mass airflow sensor has failed.
    However, the drifting idle tends to make me want to look for vacuum leaks and check the rear temperature sensor on the driver side of the head. I suspect that running over-rich is compensating for the vacuum leak so the car keeps running.
    If you have a propane torch or a can of diesel starting ether, spray it around the intake manifold while the car is idling and see if the engine speeds up. If so, then you have found a vacuum leak.
    If it were mine, I would buy a new intake manifold gasket and replace it as a routine maintenance item. It is not expensive or difficult to replace except that if you are like me, you WILL drop at least one nut, and there are several great hiding places on that side of the engine where the nuts go to hide when you drop them. You will need a magnet to recover them. You don't need to pull the manifold clear off, you just have to pull it clear of the bolts so you can slip in a new gasket. You can leave the throttle cables and most of the other connections hooked up
    If you know how to use an ohm meter, you might consider getting a manual for this car and looking up the appropriate resistance/temperature values and checking that rear temperature sensor.
    While you are replacing that intake manifold gasket, check all the vacuum ports to make sure they are clear, and check all the vacuum hoses to make sure they are intact. Also check the tubes between the mass airflow sensor and the throttle body for cracks. While you have those air tubes off, clean the throttle body and the idle air control valve with some carb cleaner. Spray a little carb cleaner through the mass airflow sensor as well. Actually, there is a special spray for cleaning mass airflow sensors that is more gentle, but I have used carb cleaner on them many times with no apparent ill effects.
    If it turns out that the mass airflow sensor has failed, that will run some $$, but having a fresh intake manifold gasket and clean throttle body and no vacuum leaks will be worth your time and money and make the car run better when you are done.

    Jun 07, 2011 | Volvo 240 Cars & Trucks

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    Can you tell me what a lambda sencer does and how does it affect the engine,as my engine light comes on but dosent stay on but when on reduces power.thank you it is a vauxhall astra club 2000 16v did not...


    Not sure, but I believe the lambda sensor is the feedback sensor, to determine if the mixture really is right.
    On most cars that is the oxygen sensor I believe, and is located in the exhaust manifold or the top of the exhaust pipe.

    Mar 30, 2010 | 1985 Volkswagen agon

    1 Answer

    Emmisions control light is on in my car dunno what it is and how much it will cost to get fixed my car runs good in park but when i put it in drive it cughs splatters and stops running


    Could be 3 things

    1 EGR valve """The EGR valve helps your car more efficiently and completely burn fuel by recirculating a portion of your exhaust and running it through the combustion process again. This results in a cooler, more complete burn of the fuel which decreases you car's noxious emissions by prohibiting the formation of some harmful gases.""""

    2 The lambda sensor needs replacing although, this does not normally cause the car to splutter.

    3 The air mass sensor or air mass meter might be oplaying up, this is located on your air box you can clean them first to see if that fix's it. also check all your air pipes are not split or leaking air.

    Air mass meters are also commonly referred to as air flow meters. They measure the mass of the air flowing into the engine. The air mass information is necessary to calculate and deliver the right amount of fuel to the engine, the sensor is the wired part of the system connected to the air mass meter.

    Jan 20, 2010 | 1996 Ford Explorer

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    Where is the air mass sensor(air fuel sensor) on 1999 toyota 4runner sr5 3.4 6cylinder. I see a pre cat sensor and post cat. Are there more


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    I hope help you; good luck (rember rated this help)

    Aug 26, 2009 | 1995 Toyota 4Runner

    1 Answer

    Check engine light


    It might but what exactly are the codes. Before you change the Mass air flow sensor, try cleaning it first with a can of mass flow cleaner.
    If your running a oil K&N filter, there could be some oil residue on the sensor. Start with that and change the filter or clean it if it's a K&N.
    The O2 sensor's could be bad also, you really need the code's to be sure what sensor is giving you the faulty signal.
    Good luck and hope this helps.

    May 05, 2009 | 2005 Ford Focus

    1 Answer

    Emissions


    yes it does sound like fuel pressure regulater/put a new one on it /they go bad and used is not a good idea /also try unplugging air mass meter if is bosch with it running if its better replace it

    Jun 28, 2008 | 1993 Volvo 940

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