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3.3 TT noise on cold startup from high pressure fuel pump is it normal (knock)

Discussion in 'Engine, Drivetrain, and Exhaust Discussion' started by HORNET, May 11, 2018.

  1. HORNET

    HORNET Newish Member

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    I hear this low knock on first starting up and it gets a little louder after a while.It lasts about a few minutes and slowly disappears as the engine rpm returns to normal.I located it's source and it's coming from the high pressure fuel pump next to the engine on the drivers side.After restarting during the day no noise .Is this normal for this high pressure pump to do?
     
  2. Kamauxx

    Kamauxx United States 1000 Posts Club!

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    On cold starts the ECU pumps more fuel to the air/fuel mixture. The ECU also makes the car idle at a higher RPM.

    It's normal for your car to make all kinds of noise when initially started after cooling off. It's also normal for it to start up quieter throughout the day.
     
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  3. Tbatten

    Tbatten United States New Member

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    Yeah that scared me too. Took mine back to the dealer ready to lose it. They held it overnight to get a cold start. Used a stethoscope, sent it to techs. Then checked the others they had on the lot. It's the same with them all. They said it's normal on cold starts and wont cause any problems.
     
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  4. HORNET

    HORNET Newish Member

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    Thanks much appreciated
     
  5. Dspec 1

    Dspec 1 Canada Member

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    Mine just started doing this after the first oil change. Good to know.
     
  6. StingerNYC

    StingerNYC United States Active Member

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    It's the high pressure fuel injectors. Very normal.
     
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