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Revs Bouncing

Tiny
JCHILTON1995
  • MEMBER
  • 2015 HYUNDAI I30
  • 1.6L
  • 2WD
  • MANUAL
  • 15,000 MILES
My 1.6 diesel I30 revs are bouncing while stationary at traffic lights etc, the car is barely 1 year old with no fault codes being found at dealer. I Notice a slight judder when driving when I lift foot off accelerator the juddering can last for 20 seconds if I dont re-apply gas. The Cars due back in to dealer in 2 week looking for some advise before its goes back in for another check.

Thanks
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Thursday, September 8th, 2016 AT 5:14 AM

9 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,313 POSTS
Is the check engine light on? I would scan for codes before it goes in so you get an idea what you are in for, here is a guide that will help you.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please let us know what you find so it will help others.

Best, Ken

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Wednesday, September 14th, 2016 AT 6:43 PM
Tiny
JCHILTON1995
  • MEMBER
  • 5 POSTS
Thanks for that Ken, I have had the codes checked no codes at all ! Check engine light is not on either.
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Thursday, September 15th, 2016 AT 4:15 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,313 POSTS
It sounds like the injector pump is bad which is a common problem with theses cars, the dealer will need to check this.

Please let us know what you find out from the dealer.

Best, Ken
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Thursday, September 15th, 2016 AT 12:20 PM
Tiny
JCHILTON1995
  • MEMBER
  • 5 POSTS
Thanks Ken cars due in on 23rd will update then.

Thanks
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Friday, September 16th, 2016 AT 1:28 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,313 POSTS
Please let us know what you find so it will help others.

Best, Ken
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Friday, September 16th, 2016 AT 6:57 PM
Tiny
JCHILTON1995
  • MEMBER
  • 5 POSTS
Hello my back on this thread, still no joy Hyundai cannot get the fault codes and have handed back with no fault found I've tried to attach a video of the revs jumping.
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Thursday, November 3rd, 2016 AT 11:51 AM
Tiny
KEN L
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Upload the video to youtube and then give us the link.
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Thursday, November 3rd, 2016 AT 11:54 AM
Tiny
JCHILTON1995
  • MEMBER
  • 5 POSTS
Hello this should be it https://m.youtube.com/watch?v=uJiY-Uy2Y6k
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Thursday, November 3rd, 2016 AT 12:11 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,313 POSTS
Nice work, It looks like the computer is having a hard time stabilizing the idle speed. Check for vacuum leaks I would also clean the MAF sensor. Here is some guides to help with both.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/mass-air-flow-service

Please let me know,

Ken

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Thursday, November 3rd, 2016 AT 1:15 PM

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