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Renault Megane 1.4 16V K4M engine - The car does not start

mielegana 5700 20
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  • #1
    mielegana
    Level 6  
    the car is from 2001

    there is a spark on all candles.
    I put the candles clean, after trying to start them I took out those smelly with gasoline, so the fuel gives.
    I changed the shaft sensor, the previous one had a resistance of 245, the current one was 215. It did nothing.

    The signal from the sensor goes directly to the computer plug? If so, what pins? I assume the cable is discontinuous. Maybe someone will drop off the diagram.
  • Helpful post
    #2
    Cobrat
    Level 22  
    Did the car quit smoking? Was something going on, was something being done?
    It would be best to start with diagnostics, which everyone here will recommend you at the beginning, than to replace the lumber blindly. Later checking the timing, compression ...
  • Helpful post
    #3
    Jackall
    Level 27  
    There is a spark, there is fuel, check if there is air and if the exhaust gases have nowhere to run. The timing is checked out.
  • #4
    mielegana
    Level 6  
    about three days before I replaced the intake manifold gaskets, cleaned the throttle, stepper motor, but after that it burned without problems.
    Immo blinks regularly and goes out after turning the ignition switch.

    How does the air work, and how do the exhaust manifolds? Remove the muffler?
  • Helpful post
    #5
    grala1
    VAG group specialist
    mielegana wrote:
    The signal from the sensor goes directly to the computer plug? If so, what pins? I assume the cable is discontinuous. Maybe someone will drop off the diagram.

    If the engine controller did not see the signal from the sensor, it would not be controlling the injectors.
    It only has information from the shaft sensor so there will be no spark or injection without it.
    Motor driver pins: 20, 79

    mielegana wrote:
    and how does air work?

    Unclip the air filter housing and see if it draws in air when turning the starter. Rather, it's ok.
    mielegana wrote:
    and how are the exhaust manifolds? Remove the muffler?

    Remove the first oxygen sensor or loosen the bolts between the manifold and the rest of the exhaust system. I also doubt it's clogged.

    See if the manifold pressure sensor is functional. Maybe he can see the atmospheric pressure all the time because it is damaged or it is leaky and floods it.
    There is 5V between the signal wire and ground after turning on the ignition, when you try to start it should be about 2V.

    By connecting to the computer, you will see if the controller can see the engine speed and what pressure in the manifold is showing.
  • #6
    mielegana
    Level 6  
    thank you for your valuable tips.
    tomorrow I am starting to implement them. I will describe the effects
  • #7
    mielegana
    Level 6  
    the car is already burning
    there was a break in the cable of the manifold pressure sensor to the computer

    now the car is booming, it is starting poorly, and at full throttle it has slightly over 2k - these phenomena were tested at ease. He smokes as hell.
    There seems to be a loss of coolant. Does this mean the cylinder head gasket?
  • Helpful post
    #8
    grala1
    VAG group specialist
    Check the compression pressure, it should explain whether it is the fault of the head gasket. If there are blow-bys to the cooling system, usually when the engine is running, the cooling hoses become hard due to the increased pressure in the cooling system.
    It would be nice to read the errors from the engine controller and see the parameters because maybe this sensor is not working properly and floods the engine.
    This sensor can also be checked by measuring the voltage at its output (middle wire) and the ground at idle speed and with the engine turned off (ignition on).
  • Helpful post
    #9
    andrzej20001
    Level 43  
    And there the intake manifold is not with the cooling channel? Maybe it is throwing fluid at the manifold. Start by verifying your "repairs". It all fell from this?
  • Helpful post
    #10
    kamiloskop
    Level 23  
    The intake manifold does not have a cooling channel there.
  • #11
    mielegana
    Level 6  
    after replacing the manifold gaskets, I still traveled 50 km

    I will check the sensor according to the instructions
  • #12
    mielegana
    Level 6  
    marking the sensor pins, manifold pressure 1, 2, 3, where 1 is from the radiator and 3 from the passenger compartment:
    voltage between 1-3 = 5V
    2-3 = 5V
    1-2 = 0V
    between mass and 1 and 2 is zero
    between ground and 3 is 5V
    it's all with the ignition on.

    How to measure idle? The plug is airtight and cannot be accessed. Should I strip a piece of insulation from the wire?

    it is 0V when attempting to fire between ground and 1, 2 and 3

    When the engine is running, you can see its significant vibrations, and removing the cable plug immediately extinguishes the engine.

    sensor removed - the O-rings show a glowing liquid smelling of gasoline.
  • Helpful post
    #13
    grala1
    VAG group specialist
    You need to measure the voltage on the connected plug and you need to read the engine running and the ignition off but on.
    We are only interested in reading between the weight of the car and the sensor.
    From what I remember, there are signs A, B, C on the plug and we should stick to that.
  • #14
    mielegana
    Level 6  
    I have purple wires from the radiator, orange in the middle, black from the glass. The A, B, C markings are on other plugs but not on this one.
    On the turned key switch between ground and purple is 4.99 V, ground and orange 4.77 V, ground and black 0.45 V.
    At startup, the middle one is 4.77
  • #15
    Stiwen1
    Level 21  
    Hello, I do not know where to look for help, maybe you will help me megan 1.4 8v does not start, no spark and the computer does not see the engine speed at the time of shooting, the shaft sensor replaced unchanged after turning the key, the fuel pump works for about 3 seconds and will give a signal to the coil and when I turn the starter no coil power supply no spark cables from the coil to the computer checked cable to the relay from the computer to the relay checked power supply mass checked the immo light goes out after turning the ignition switch maybe someone had something similar computer sirius 32.
  • #16
    andrzej20001
    Level 43  
    Wires from the shaft sensor ok? Not changed places?
  • #17
    Stiwen1
    Level 21  
    Not changed, because the original plug and nothing combined and what voltage should there be on this sensor when measuring with a meter.
  • #18
    andrzej20001
    Level 43  
    Nothing if he sees the rotation and the sensor and the harness are dead. The permission to start in the parameters is?
  • #19
    darobocian
    Level 12  
    Brand sensor or "no name" because new does not mean functional. I recently worked on the topic in Opel, a new sensor and the controller does not see an error or rotation
  • #20
    Stiwen1
    Level 21  
    The sensor is used, the cables are in working order in the computer, you can see the immobilizer active and here is my question if the immobilizer is blocked, should you see the shaft sensor in the computer, and here I would like to consult what cuts off the immobilizer or shaft sensor or something else, maybe someone had and checked. Greetings.