Author Topic: rough/ intermittent/ irregular idle (misfire???)  (Read 2153 times)

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  • gb United Kingdom
    Leicester, UK
Hello to everyone!
Seeking the wisdom of the forum and suggestions. About half-year ago started to notice that a strange behaviour in engine work while on idle. Here are the list of simptoms which started at about 60k miles:

 - only happens when the engine is fully at operational temperature (never on cold or below 90 degrees C)
 - car starts without any issues, always, in hot or cold weather. (it was -12 here in UK for a bit, no issues)
 - revs gauge shows a slight dip and jump on idle (sometimes from 500 - 900 rpm)
 - increased vibration from engine (feels inside the car)
 - "wrong sound" of idling diesel engine
 - feels like a misfire, irregular work of engine
 - whilst driving the car behaves without any issues, engine pulls like a dream!
 - no smoke visible (DPF fitted), no abnormal smells
 - can happen any time, without any logical trigger  :crazy1:- can be absolutely normal for a month, but can be happening many times per day, or several times a week

 As far as I was reading some other forums in search for the answer I've came with a few guesses : crankshaft position sensor or/and fuel rail pressure sensor going nuts; several different issues with high pressure fuel pump, which could range (in repairs cost) from 50 to 500.

Has anyone else experienced similar issues? What are the solutions to it? 
The car still has got manufacturers warranty till February 2019, I am planning to go Hyundai with this issue soon. But like I said it can come up at any time or it can lay dormant for weeks not showing any signs. And HY charge 95 per hour for investigation.

The patient is serviced reguarly (last was at HY, 60k miles major service, all filters changed, then extra oil change at 67k miles), had undergone an engine carbon clean at about 55k miles. Had 3 bottles of Wynn's diesel fuel system and injector cleaner fluid since then. 
2014 1.6 CRDi 128hp, 73k miles

Here's a link :link: Hyundai i30 1.6 CRDi 128hp rough intermittent idle - YouTube  of the problem (mostly it can be heard, camera doesn't capture the irregular vibrations that good):
Cheers!


  • 2014 1.6 CRDi 128hp Style "Cream"

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  • au Australia
    Perth
Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #1 : July 07, 2018, 10:06:29 »
If everything is running fine and only noticeable at idle then maybe it's just the thermo fan cutting in :undecided:

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  • HOS BOSS
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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #2 : July 07, 2018, 10:55:37 »
Have you considered/altering idle rpm's and see how it goes.

Re charge
As still under warranty get it back to dealers to check out.

Should be nil cost plus once it is logged then it is recorded on the system until resolved.

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  • au Australia
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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #3 : July 08, 2018, 02:21:53 »
Another suggestion only, one injector is misbehaving. At higher Revs the effect of the inefficient one is smoothed by the other 3
  • Every FD model; BMW Z3 M; Mitzi Magna(mobile office)

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  • gb United Kingdom
    Leicester, UK
Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #4 : July 09, 2018, 17:19:08 »
If everything is running fine and only noticeable at idle then maybe it's just the thermo fan cutting in :undecided:

Hm...Thermo fan? I believe that could cause a dip in revs once (like after switching on AC or rear demister,or lights), but should return to normal idle after. Looks like it's a task for HY to find out what demon possessed the engine.
  • 2014 1.6 CRDi 128hp Style "Cream"

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  • gb United Kingdom
    Leicester, UK
Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #5 : July 09, 2018, 17:22:51 »
Have you considered/altering idle rpm's and see how it goes.

Re charge
As still under warranty get it back to dealers to check out.

Should be nil cost plus once it is logged then it is recorded on the system until resolved.

Sent from my ATU-L11 using Tapatalk

Ehm...not really sure what do you mean by altering the idle rpm. You mean just revving up a bit while in neutral? Or...?
Yeap, going to HY soon. Let them sort it out, although it's one of those things where they'll take the car for a spin around the block and the engine will behave as normal. And as soon as I get it back it'll start playing up again...Maybe the video will convince them to investigate until they actually find the cause?
  • 2014 1.6 CRDi 128hp Style "Cream"

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  • gb United Kingdom
    Leicester, UK
Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #6 : July 09, 2018, 17:35:01 »
Another suggestion only, one injector is misbehaving. At higher Revs the effect of the inefficient one is smoothed by the other 3

That was on my mind. Still, logically thinking it should be playing up on idle all the time, and not just when it's in a bad mood, or why the hell it's doing it anyway.
Still, a possibility. I'm guessing HY should send the faulty injector for a refurb (if that's the fault), or replace with a new one.
A proper injector test will definitely show if there's an issue, but I doubt that HY will be willing to take off all 4 injectors, send them for a specialised test.
I believe that GD model CRDi engines have got Bosch injectors fitted. And one place I've found in my city charge 25 per injector.

:link: Hyundai i30 Diesel Fuel Injectors
  • 2014 1.6 CRDi 128hp Style "Cream"

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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #7 : July 09, 2018, 18:25:23 »
You are correct, switch of A/c and the like done with the cooperation of the ECU which will alter RPM to compensate.

"Have you considered/altering idle rpm's"?...... that's simple just twist the screw thingy on the carburettor. :mrgreen:
 
Eventually, the alleged intermittent injector would probably fault permanently. If I were there I would be checking electrical connections especially to the injectors, look for corrosion  and use WD40.
The Common rail system on all the i30s is Bosch . For optimum performance the ECU should be remapped to the codes on each injector.
Hy are going to screw you, so I would look for an independent mechanic who has a few years in the trade, to advise you. Remember we are all just guessing at this stage.  :goodjob2:
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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #8 : July 18, 2018, 02:45:38 »
If this is the problem with injector probably there will be be a fault shown with too early dpf regenerations as result of black or white smoke. Probably every few days. On my opinion nothing without reading live data parameters.
  • 1.6crdi

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  • gb United Kingdom
    Leicester, UK
Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #9 : September 24, 2018, 16:00:37 »
diesel1984 - thanks for the thought. I think it's also linked somehow with the DPF regeneration.
However, I've been to HY dealer last week, told about the problem, showed video proof as well, and got a service booked for 12th of October. Was told that HY are going to look deeply in this matter, as apparently nobody from that dealership ever encountered such issue.

Update will follow after 12th of October. 

Cheers!
  • 2014 1.6 CRDi 128hp Style "Cream"

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  • gb United Kingdom
    Leicester, UK
Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #10 : October 13, 2018, 12:35:46 »
So....it all turned out quite well. Been at the HY dealer yesterday, got the car back. They said that the issue is now fixed and it was because of the software. They've updated it, and it all should be sound now. I hope it will be. Didn't charge anything too (job was done under warranty), which is always nice. :P
Will give some feedback after a month or so. Will see if the issue repeats, or dealer's magic touch on the ECU did the trick. :cool:

Good luck to everyone!
  • 2014 1.6 CRDi 128hp Style "Cream"

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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #11 : October 13, 2018, 13:03:51 »
Quite strange to get an ECU update on a four year old vehicle :confused: I'm glad it's running better for you though :goodjob2:

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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #12 : October 13, 2018, 18:53:18 »
So....it all turned out quite well. Been at the HY dealer yesterday, got the car back. They said that the issue is now fixed and it was because of the software. They've updated it, and it all should be sound now. I hope it will be. Didn't charge anything too (job was done under warranty), which is always nice. :P
Will give some feedback after a month or so. Will see if the issue repeats, or dealer's magic touch on the ECU did the trick. :cool:

Good luck to everyone!

Thanks so much for coming back to us. Fingers and toes crossed it's sorted.  :fingers:
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

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  • gb United Kingdom
    Leicester, UK
Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #13 : October 20, 2018, 15:03:59 »
And here we are again, the engine started to play up on idle yesterday, and was doing it several times today while driving around for shopping. Guess software update didn't help that much at after all. Back to dealer in 3 weeks now, as will have to take a hire car, while they have a look at another issue.
  • 2014 1.6 CRDi 128hp Style "Cream"

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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #14 : October 20, 2018, 16:27:32 »
And here we are again, the engine started to play up on idle yesterday, and was doing it several times today while driving around for shopping. Guess software update didn't help that much at after all. Back to dealer in 3 weeks now, as will have to take a hire car, while they have a look at another issue.

Bugger! Maybe that shark should be frowning now!  :Pout:
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #15 : October 20, 2018, 16:41:09 »
And here we are again, the engine started to play up on idle yesterday, and was doing it several times today while driving around for shopping. Guess software update didn't help that much at after all. Back to dealer in 3 weeks now, as will have to take a hire car, while they have a look at another issue.

This is an intermittent idle and 'at moderate speed' misfire. I come back to my notion of one dodgy injector.

Good luck
  • Every FD model; BMW Z3 M; Mitzi Magna(mobile office)

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  • gb United Kingdom
    Leicester, UK
Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #16 : November 07, 2018, 16:26:15 »
Hello everyone. So I'm back from the HY dealer. This time they......"dramatic drum solo".......plugged in diagnostics machine and cleared the fault codes. http://rs253.pbsrc.com/albums/hh49/decbzr/badum-tishcom_5e1f7bf07da81488652e6a362cefafad_zps18d08f02.jpg~c200
After that done a road test and no fault codes appeared, so it's all fixed now! - anyway, that's what I've been told...When I asked how that is going to help ,the lady just smiled and said to monitor the issue and report if it comes back... Eh, I wish you could actually talk to the actual people in the service, that do the work on the car, and not just to those behind the desk.
Yeap. Just made me smile , and that's about it. At least got the car washed, and HY also repaired the squeaking drivers seat problem, free of charge. I feared it'd cost me around 150 in total (10 for courtesy car, 95+VAT for investigation, and few extra for additional work). Turned out lucky this time.

The issue has gone into some remittance lately, only happened 2 times in 3 weeks. Probably because I'm mostly on the motorway now (56 miles return trip to work).

So will keep you guys updated if the issues comes back.

Good luck everyone!
  • 2014 1.6 CRDi 128hp Style "Cream"

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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #17 : November 07, 2018, 16:42:57 »
 :eek:
You are as skeptical as I am. 
Clearing codes...................................  :utterrubbish:
A. what were the codes?
B. What fault(s) did the codes indicate?
Do they understand the A+B relationship? 

Like you we await next episode. Thanks for keeping us in the loop.
  • Every FD model; BMW Z3 M; Mitzi Magna(mobile office)

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  • gb United Kingdom
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Re: rough/ intermittent/ irregular idle (misfire???)
« Reply #18 : November 11, 2018, 16:59:59 »
:eek:
You are as skeptical as I am. 
Clearing codes...................................  :utterrubbish:
A. what were the codes?
B. What fault(s) did the codes indicate?
Do they understand the A+B relationship? 

Like you we await next episode. Thanks for keeping us in the loop.

I know, it's a joke!
"Leave a note for wife to buy some bread. She throws the note away. No note - no problem!"

Will post any updates  on the story.

Cheers!
  • 2014 1.6 CRDi 128hp Style "Cream"

 


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