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Suzuki Grand Vitara 2.0 2007. - It doesn't start in the cold

kubas10 9966 18
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Why does a Suzuki Grand Vitara 2.0 2007 with LPG sometimes crank but fail to start when cold, while it starts normally when warm?

The most likely cause is the LPG system disturbing petrol-mixture adaptation or leaking gas into the intake, which can flood the engine during cold starts [#16530259][#16534403] Turn off the gas bottle valve, burn out the remaining gas, and drive on petrol only for a while to see whether the cold-start problem disappears [#16530259][#16533992] Check the LPG computer for reducer temperature and whether it is forcing a gas start, and verify lambda/emulation settings because a bad emulator can skew the petrol ECU adaptation [#16528325][#16528313] The black spark plugs and the very long injection time of 40 ms at start, dropping to 5 ms after about a second, also point to an overly rich mixture/flooding [#16529947][#16533992]
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  • #1 16528034
    kubas10
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    Hello, Suzuki Grand Vitara 2.0 103kW 2007. From time to time, the car does not burn on a cold engine. No fault codes, when it does not start, the controller sees the engine speed, the fluid temperature is also normal, the immo goes out. The fuel pressure was 0.5 bar too low, but after replacing the pump, the problem remained, but the pressure is correct. When it starts, the engine starts, it's okay when hot.
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  • #2 16528043
    panstalin2
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    Candles cables replaced?
  • #3 16528057
    kubas10
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    Candles ok, a separate coil for each cylinder.
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  • #4 16528147
    panstalin2
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    Battery voltage does not drop too much when starting with a cold engine?
    He smoked normally in the cold?
    Temperature sensor OK?
    What compression pressure on a cold engine?
  • #5 16528170
    kubas10
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    panstalin2 wrote:
    Battery voltage does not drop too much when starting with a cold engine?
    He smoked normally in the cold?
    Temperature sensor OK?
    What compression pressure on a cold engine?


    The starter turns normally, he saw the temperature at 18oC, he saw the engine speed too, but he did not fire. I did not check the pressure in the cylinders because the engine seems to be relatively fresh, although it has an LPG sequence.
  • #6 16528236
    panstalin2
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    If it does not light up, disconnect the clamp from the battery for 20 seconds and connect and check if it lights up from the first time.
    You have to write that there is LPG.
  • #7 16528266
    kubas10
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    How does what light it?
  • #8 16528313
    panstalin2
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    Then log in to the engine and make sure that the lambda is pairing correctly and that the lambda emulation by the LPG controller is correct.
  • #9 16528325
    sk700
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    Connect to the gas computer and check the reducer temperature, because there may also be a situation where the controller sees higher and tries to start on gas at all costs.
  • #10 16528756
    alien8_6
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    Just turn off the gas on the cylinder and test. These engines hate gas. If it's on the standard cylinder head, it can withstand 40,000, check the clearance.
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  • #11 16529947
    kubas10
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    The spark plugs are new and tinted black (mixture is too rich), the pressure in the cylinders on the cold engine is 11 bar.
  • #12 16530023
    panstalin2
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    What is the reading of the engine temperature and the lambda probe parameters?
  • #13 16530259
    tzok
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    The lambda probe does not work on a cold engine, but if you feel the fuel, it probably has a distorted adaptation of the mixture composition and floods the engine when you try to start. Listen to the previous speaker and turn off the gas valve on the cylinder (important), drive out at least half a tank of gas without using the LPG system and say whether the problem has resolved.
  • #14 16530723
    kubas10
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    So I will.
  • #15 16530773
    panstalin2
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    It is possible to start the cold engine on gas only - in emergency mode without gas for a while ???
    (so as not to freeze the reducer)

    Turn on the ignition and hold down the gas button for 10s. and turn on the starter - will it ignite immediately?
  • #16 16533992
    kubas10
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    I turned off the gas on the cylinder, burned the rest from the evaporator and on the cold engine running on gasoline at the peak start-up time, the injection time was 40ms and fell after about 1 second to 5ms and the car fired surprisingly after 2 days.

    Added after 34 [seconds]:

    The battery was disconnected.
  • #17 16534403
    tzok
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    So there are 2 options - either a poorly calibrated installation changes the injection adaptation of the petrol controller, or there is some leakage in the valves and LPG gets into the manifold when the vehicle is stopped.
  • #18 16534514
    panstalin2
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    On the next morning, he may smell the air filter - whether it stinks of gas on a cold one.
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  • #19 16534973
    kubas10
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    The client will drive 2 weeks on petrol on a screwed bottle and we will see, maybe the adaptation values will return to normal and the car will start to start normally.
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Topic summary

✨ The discussion revolves around a 2007 Suzuki Grand Vitara 2.0 that intermittently fails to start in cold conditions. The owner reports no fault codes, normal engine speed detection, and correct fluid temperature during failed starts. Initial troubleshooting included checking fuel pressure, which was found to be low but corrected after a pump replacement. Suggestions from responders included checking spark plug cables, battery voltage, and compression pressure. The presence of an LPG system complicates the issue, with recommendations to disconnect the gas system temporarily to assess if the problem persists. The owner noted that the spark plugs were new but blackened, indicating a rich fuel mixture. Further diagnostics suggested potential issues with the lambda probe and fuel adaptation settings. The owner plans to run the vehicle on petrol for two weeks to see if the starting issue resolves.
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