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Thread: Y30DT - Overfueling during hot startup?

  1. #1
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default Y30DT - Overfueling during hot startup?

    Ever since I bought the car almost two years ago I noticed that when I start the engine when it's fully warmed up and it's been sitting for less than 5-10minutes, it will turn over SLOWER than when it's stone cold at -5°C. It will start with the same amout of turns and won't sturggle to fire...just seems to be slower. Battery is good.
    On a cold morning it won't smoke at all, but if warmed up it will kick out a puff of soot when I start it...that's why I think it's overfueling.
    The car now has a Steinbauer Tuning Box fitted, which if anything is making the car smoke less...

    Suggestions anyone?

  2. #2
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default

    I also had the puff of smoke on a warm start up but only from the left tail pipe . This seems to have stopped since I cleaned the air temperature sensor, the one in the inlet manifold close to where the EGr is located. http://vectra-c.com/forum/showthread.php?t=152973

    I've not noticed any difference in cranking speed though.

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    Regular Member Critch's Avatar
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    Vehicle : vauxhall vivaro

    Trim : Basic

    Engine : 1.9

    Year : 2004

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    Does it reach temp ok? Does it run ok otherwise?

  4. #4
    Regular Member m8internet's Avatar
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    It's all about the variation between engine block temperature and ambient temperature
    On older engines this was controlled from the fuel pump, on the x30DT family this is controlled from the EMS

    There are also other factors, such as oil viscosity and battery condition

    At -5'C (cold engine block temperature) I would expect the engine to turn over at slightly higher revs, but it may sound like it is turning over slower as there is more noise
    Equally, I would not expect to see any excessive black smoke (full combustion)

    At 25'C (warm engine clock temperature) I would expect the engine to turn over at normal revs, as a result there will be very little variation in sound
    I would also expect occasional black smoke as the engine is not making any changes so any fuel previously in the system may not be fully combusted as the glow plugs may not be required (even though the light appears during start up sequence)

  5. #5
    Regular Member Celes's Avatar
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    Vehicle : Opel Signum

    Trim : Sport

    Engine : 3.0 CDTI

    Year : 12/03

    Default

    It reaches temperature just fine and stays at 87°C most of the time.
    I won't try to remove that sensor mate cos the manifold has a thick soot crust on its walls...I don't want any big carbon piece to get sucked into the cylinder...

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