sucking type noise after ignition on

[JR750]

Hi,

When i turn my ignition on, I can hear some sort of sucking/rotating noise from underneath the car for a second or less.

Is that normal?

Cheers

 

[dholdi]

Is it a diesel ? My Leon tdi does the same which I guess is the fuel system priming. Done it ever since I got it so guess it is normal.

 

[flegz16]

i was thinking the same thing earlier when i started my car up.

anyone tell us what it is?

mines a cupra diesel

 

[JR750]

Yep it is a diesel. First thought was 'Oh ****, the turbo'. Tell me its not that ?

 

[dholdi]

No I dont think it the turbo, with just the ignition on you havnt started the car so the turbo will still be stationary
I'm pretty sure its the lift pump you can hear which pressurises the fuel lines from the tank to the high pressure injector pump.

 

[NickyJam]

its the fuel pump pushing fuel into the engine, normal on diesels

 

[CJRamze]

Ahhh I miss that sound from my derv days,
It sounds really loud when You've had little sleep.... I can just dear it now.
Totally normal, Mine did it when I picked the car up from the dealer, only had 6 miles on the clock!

 

[R1ch85]

mine does it too, once when I open the door, and again when i turn the ignition on. Cupra petrol

 

[NickyJam]

so guessing it's on the high-end models

 

[rocky2008]

Yep it is a diesel. First thought was 'Oh ****, the turbo'. Tell me its not that ?

turbos rely on exhaust gasses to work, so you can guarantee with just the ignition on its not going to be a turbo problem lol.

 

[g8rvn]

so guessing it's on the high-end models

Not at all, mine does it on a 1.4 petrol too

 

[kojack]

My wifes 1.4 petrol does it, we just thought it was the immobilizer ?

 

[carly]

Hi,

When i turn my ignition on, I can hear some sort of sucking/rotating noise from underneath the car for a second or less.

Is that normal?

Cheers

its the water starting to run round the engine. and it only happens when you start you car .