i30 Owners Club

2011 i30 2.0 very high idle fuel usage

Luke M · 5 · 1621

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Offline Luke M

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    • Posts: 2

    • za South Africa
      Gauteng




Hi guys, please see photo for context.

My 2011 Hyundai i30 2.0 has been doing this for a while while idling. I can get anywhere from 20L/100km (11.76 MPG) all the way up to 60L/100km (3.9 MPG)

Note this doesn't happen while driving, only idling. I get 7L/100km (33.6 MPG)highway driving and 12L/100km (19.6 MPG) in stop-start-traffic.

My idle sits at just a hair over 1000 RPM but my car is just guzzling fuel while idling

Anyone have a similiar experience or know what the issue could be?

Thanks, Luke
  • 2011 FD 5 Door Hatch, Petrol 2.0, Manual, Gun Metal Grey


Offline Aye30

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    • Posts: 172

    • au Australia
      Perth
Hi, Just out of curiosity, does your speedo drop to zero when the car is stationary, as it looks like your speed is at 4 or 5 kilometres.


Offline Luke M

  • 1st Gear
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    • za South Africa
      Gauteng
@Aye30 yes it does drop to 0. I took that photo as I was starting to pull off from the traffic lights so I was moving. Noticed the fuel economy around 64L/100km and as I took the photo it dropped below to 59L/100km
  • 2011 FD 5 Door Hatch, Petrol 2.0, Manual, Gun Metal Grey


Offline Aye30

  • 3rd Gear
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    • Posts: 172

    • au Australia
      Perth
I belive the instantaneous calculation is done on the fuel injector size x pulses per minute relative to the distance traveled. So stationary will drive up the value as you are not moving.
Our 2L 2010 fd idles at about 800, and I think it is supposed to be 750.  All stationary cars idling will have instantaneous fuel usage go high. Your car is idling higher, but  that may be down to factors as load on the alternator, airconditioning, oil thicknes and age or where someone has set the idle at, just to mention a few from a very long list.  Totally off  topic,  have you had the steering coulper replaced?


Offline eye30

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    • Posts: 27,360

    • england England
      Wirral

  • Wirral, UK. - 1.4 Petrol Active - Aqua Blue
Have you checked what the idle speed is per handbook.

If not 2,000 rpm then set to book value and see how it goes.

My 1.4 petrol idles at 700 rpm.
  • 1.4 Petrol Active I'm no expert, so please correct me if


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