Revs Bouncing

2015 HYUNDAI I30
15,000 MILES • 1.6L • 2WD • MANUAL
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JCHILTON1995
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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
Sep 8, 2016 at 5:14 AM
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STRAILER
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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

Sep 14, 2016 at 6:43 PM
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JCHILTON1995
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thanks for that Ken, I have had the codes checked no codes at all ! check engine light is not on either.
Sep 15, 2016 at 4:15 AM
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STRAILER
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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
Sep 15, 2016 at 12:20 PM
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JCHILTON1995
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thanks Ken cars due in on 23rd will update then.

thanks
Sep 16, 2016 at 1:28 AM
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STRAILER
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Please let us know what you find so it will help others.

Best, Ken
Sep 16, 2016 at 6:57 PM
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JCHILTON1995
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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.
Nov 3, 2016 at 11:51 AM
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STRAILER
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Upload the video to youtube and then give us the link.
Nov 3, 2016 at 11:54 AM
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JCHILTON1995
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Hello this should be it https://m.youtube.com/watch?v=uJiY-Uy2Y6k
Nov 3, 2016 at 12:11 PM
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STRAILER
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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



Nov 3, 2016 at 1:15 PM