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Citroen C4 Picasso 2.0 gasoline - Cold engine jerking when warm

mc-giwer 4653 9
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  • #1
    mc-giwer
    Level 10  
    I have a strange problem with the car, when it is warm above 10 degrees outside and the car is in the sun and the engine is cold, after starting the engine when you try to add gas, it throttles the engine, to start you need to quickly add more gas, at idle it works evenly, only when you try to add gas, it gradually starts to throttle it, up to approx. 1500 rpm, at higher revolutions, it is strange that this only happens when it is warm outside and the higher the temperature outside, the bigger the problem, in winter this problem is at all does not occur, it seems to me that it is flooding him with the suction? After warming up the engine like this, after about 5 minutes or driving from a kilometer, the problem disappears.
    So far I have replaced the fluid temperature sensor (I was advised so) but nothing helped, maybe you have an idea? I think it is important that the situation does not happen in winter and autumn, when it is cold outside, it is worst felt when the car is in the sun and it is above 20 degrees outside. It seems to me that it is something with suction, only what ? if the probe fell, the problem would probably be all the time? Maybe it's a sensor, but what?
  • #2
    sanfran
    Network and Internet specialist
    Have you done an engine inspection - checking the candles, maybe replacing them, checking if the spark plug sockets are clean; further on what the air filter looks like.
    Of the sensors, this is still an important flow meter, maybe a throttle assembly, if you have an electronic one.
  • #3
    mc-giwer
    Level 10  
    Candles, filters ok, the throttle was also checked, the car was on diagnostics and there are no errors, the things you gave as if they were dead, the engine would go crazy all the time and I note that the problems only appear on a cold engine and only when the outside temperature is quite high , the problem is bigger, the higher the temperature outside, e.g. 20-30 degrees Celsius and the sun, after firing the engine at idle speed, gets the crank when you want to move slowly, then it tugs but after a kilometer everything passes, it looks too much to me rich mixture, as if the engine is running on too much suction.
  • #4
    pepe150
    Level 36  
    Did you check the temperature sensor measurements on the computer?
  • #5
    mc-giwer
    Level 10  
    Are you talking about the outside temperature sensor? I did not check it, I have to find this option in the diagbox and actually analyze this sensor, I once remember a situation that the temperature sensor next to the meter showed a different temperature than the one in the diagbox, then I was looking for a second sensor but I did not find it, then I compared these temperatures again and It was ok, and I never noticed that the meter showed higher or lower temperature than it may be outside, but when I find where is this option in the diagbox you are talking about, I will look at these measurements.
  • #6
    pepe150
    Level 36  
    Engine temperature sensor.
    I mean whether, when you get in the car at night, the computer does not show -40 or -20 when it is about 2 degrees. Does not show 60 degrees on a cold engine. Analyze.
    Because the engine temperature affects the selection of the fuel dose.
  • #7
    User removed account
    User removed account  
  • #8
    Gromy
    Level 6  
    Hello, I have the same problem. So far, I have listed everything that was mentioned on the forum and nothing. I wonder if anyone has solved this intricate puzzle. I was at the engine diagnostics and the gentlemen said that it was a probe or a computer and here is my little digression, I can replace parts at random, I can without a diagnostician, so I'm curious if someone managed to solve such a problem because I saw that not one forum the problem repeats, but no solutions. Or maybe...??? Help!!!
  • #9
    mc-giwer
    Level 10  
    I did not find a solution, I did not replace the probe, but I also put it later that it was her fault, I would not take the computer into account, and in fact many people have a problem with this in this engine. In winter, this problem did not occur, finally it was time to change the car, so I do not know what will happen next.
  • #10
    tomaszjangawron
    Level 1  
    Hello,
    I have a Citroen C4 grand Picasso 1.8 petrol + gas and, like some of you, I struggled with the problem of engine jerking when it was cold. The jerking only occurred for about 1 minute. It was possible to drive the car, but it meant that the car was doing "frogs" on the street. Adding gas several times before starting eliminated the problem, but such gassing of the car at a standstill was irritating so I decided to look for the cause of the problem.
    According to the forum hints, I replaced the temperature sensor, but that did not solve the problem.

    The cause of the problem was elsewhere. By accident, it turned out that the poor w the vacuum sensor was the cause of the problem.
    The sensor is located in the engine block on the radiator side. Access to it does not require any disassembly.

    It is worth unplugging the plug and spraying it with electrical connectors. A simple procedure and the effect is amazing. Finally, I can start the car and go straight away without worrying about the engine choking.