Author Topic: RPM fluctuates after cold start for ~30 secs. Idles fine once settled.  (Read 1811 times)

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Hi guys,

Just picked up a 63 plate Hyundai i30 1.6 Diesel Blue Drive Edition. I love the car and couldn't be happier. I am however having a slight issue when starting the car from cold in that the RPM will bounce around for approx 30 seconds or so. The engine sounds as if it is pulsing along with the RPMs and will also settle after approx 30 seconds. Once settled the car idles perfectly and will idle great in traffic etc but having had the car less than a week this is an issue I'd really like to resolve asap before the dealership put it down to wear and tear and refuse to repair it. Any ideas what might be causing this??

TIA


  • Hyundai i30 1.6 CRDi Blue Drive Edition 5dr

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Hi Cap2018, welcome to the forum :D

Do you notice any excessive smoke from the exhaust when this is happening while cold? Does it occur when warm or hot?
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Hi Cap2018, welcome to the forum :D

Do you notice any excessive smoke from the exhaust when this is happening while cold? Does it occur when warm or hot?

Thank you! I can see what all the fuss is about, the car is fantastic!

I haven't checked the exhaust for smoke yet as I'm usually in the drivers seat but will make a point to check tonight. The temperature has been approx 15 - 20C when starting this week, with the engine cold of course.
  • Hyundai i30 1.6 CRDi Blue Drive Edition 5dr

Hi Cap2018, welcome to the forum :D

Do you notice any excessive smoke from the exhaust when this is happening while cold? Does it occur when warm or hot?

Thank you! I can see what all the fuss is about, the car is fantastic!

I haven't checked the exhaust for smoke yet as I'm usually in the drivers seat but will make a point to check tonight. The temperature has been approx 15 - 20C when starting this week, with the engine cold of course.

No smoke (white or black) from the exhaust when started. I have contacted the dealership and sent over a video of the tachometer and they think it may be the glow plugs. They have said they will do a full diagnostic and repair under warranty so hopefully they are a little more thorough than they were when they serviced it last week! The idle usually sits at around 750rpm but when it's having one of these moments it tends to bounce between 750 and 900 for the 30 seconds or so that it needs to settle.

Given that the car idles perfectly once it gets going do you think that the glow plugs sound like the most likely explanation? my only other concern is a leak that may be sealed once various components are warm and expanded. Hopefully I will get it back in full working order and I can start enjoying the car as much as I want to!
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I was hinting at the glowies when I asked about any excessive smoke ;)

If it IS a warranty jobbie then you just about made it in time (with your 63 reg).
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I was hinting at the glowies when I asked about any excessive smoke ;)

If it IS a warranty jobbie then you just about made it in time (with your 63 reg).

Luckily I have an additional 12 months warranty from the approved used dealership (on top of what's left of the 5 year manufacturer warranty) .. as long as nothing goes wrong after that!

Would the glow plugs being faulty be likely to cause excessive smoke or does the lack of smoke support the fact that it might well be the glow plugs?
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Interesting stuff. Glow plugs would not normally be replaced under warranty as they are a consumable. If they are in this instance and they fix the issue that is a real bonus as they are usually a minimum of A$100 (often more) + labour.  :cool:
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

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Same as Shambles, immediate thought is glowies, assume this is a 2014 model ? 63 plate? Also Kms we don't know, so can only speculate on warranty.
It could also be circuit fault or computer not powering plugs and intake preheater long enough.
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Same as Shambles, immediate thought is glowies, assume this is a 2014 model ? 63 plate? Also Kms we don't know, so can only speculate on warranty.
It could also be circuit fault or computer not powering plugs and intake preheater long enough.

Late 2013 model, 57000 miles. Still under manufacturers warranty and have the additional 12 months from the dealership. Only bought the car 7 days ago with a full service and MOT  so would be very disappointed if they tried to charge me for work that already needed doing! what else could I look for with regards to a circuit/ computer fault? I donít have any warning lights and the glow plug light goes out almost immediately after turning the key to preheat
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Mate, don't chase rabbits down holes until you eliminate the obvious pest.
The light is an indication of performance, but the glow plugs actually remain heated for a lot longer.
we should stick with the obvious  for now... that would appear to be poor fuel /air heating.

 :goodjob2:
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Mate, don't chase rabbits down holes until you eliminate the obvious pest.
The light is an indication of performance, but the glow plugs actually remain heated for a lot longer.
we should stick with the obvious  for now... that would appear to be poor fuel /air heating.

 :goodjob2:

It's booked in tomorrow at the Hyundai garage - dropping it off tonight to allow for a cold start tomorrow. Will update once they have completed their 'investigation' on Friday morning. Really hoping to have it sorted. Have had endless idle issues with my girlfriends mini (not just on cold start) so am gutted to see it continue into this vehicle! fingers crossed I'll be a happy man come Monday ..
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Have had endless idle issues with my girlfriend

Sorry, you lost me there! :)
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Have had endless idle issues with my girlfriend

Sorry, you lost me there! :)

It's ok, I think they are going steady now..  :snigger:
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Shame about the car! fingers crossed
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Picked up the car yesterday, further investigation still needed 🤨 for some reason they only scheduled the car in for an hour and so didnít get much beyond scanning the car for codes.

Booked in the week after next for a couple of days when I can get a courtesy car to keep me on the road. Really hoping this doesnít mean itís something serious ..

Spent weeks deciding on a car, settled on the i30 for their reliability :rolleyes:
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Picked up the car yesterday, further investigation still needed 🤨 for some reason they only scheduled the car in for an hour and so didnít get much beyond scanning the car for codes.

Booked in the week after next for a couple of days when I can get a courtesy car to keep me on the road. Really hoping this doesnít mean itís something serious ..

Spent weeks deciding on a car, settled on the i30 for their reliability :rolleyes:

Hopefully nothing serious.  Hang in there. Sorry for your troubles.   :Pout:
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...for some reason they only scheduled the car in for an hour and so didnít get much beyond scanning the car for codes, which takes 5 minutes :rolleyes:

 hoping this doesnít mean itís something serious .. like dealer pulling finger out and doing some real work

Spent weeks deciding on a car, settled on the i30 for their reliability :rolleyes:

To sort of put your mind at rest, I have a contact who picks up breakdown cars for the RACQ ( equivalent of your AA) he bought his wife a diesel i30, because that is the only car he NEVER has to pick up.

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...for some reason they only scheduled the car in for an hour and so didnít get much beyond scanning the car for codes, which takes 5 minutes :rolleyes:

 hoping this doesnít mean itís something serious .. like dealer pulling finger out and doing some real work

Spent weeks deciding on a car, settled on the i30 for their reliability :rolleyes:

To sort of put your mind at rest, I have a contact who picks up breakdown cars for the RACQ ( equivalent of your AA) he bought his wife a diesel i30, because that is the only car he NEVER has to pick up.

I think I needed to hear that! The car drives great once itís settled down so fingers crossed it is just the glow plugs and once theyíre replaced itíll be plain sailing!
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Dropped off this morning for investigation. Booked in for 3 days so have got a Hyundai i10 courtesy car for 3 days to cover me .. huge difference! My i30 has been beginning to make a bit of a clunk when lifting the clutch from first into second and second into third so I mentioned that this morning and hopefully they will make sure it's nothing to worry about! Will update when I hear back from them ..

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Dropped off this morning for investigation. Booked in for 3 days so have got a Hyundai i10 courtesy car for 3 days to cover me .. huge difference! My i30 has been beginning to make a bit of a clunk when lifting the clutch from first into second and second into third so I mentioned that this morning and hopefully they will make sure it's nothing to worry about! Will update when I hear back from them ..

Thanks for the update. Good luck for a trouble free fix.  :cool:
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 :wss:

Wow an i10,  :yummy:       Must be 1 Litre   :toldyou:
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:wss:

Wow an i10,  :yummy:       Must be 1 Litre   :toldyou:

Correct.. 1 litre petrol  :goodjob2:

Each to their own but I canít stand the thing! Fine once it gets going but really awkward to move off from a standstill  :fum:
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One of the luxuries of living in Oz. Nothing less than i20.  :victory:

In 1970s we used to get under powered versions from Britain . Ford Escort was unforgettable.They had compensated the smaller, city only, motor with a very low ratio diff, would rev like mad on the highway at 60 mph.
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One of the luxuries of living in Oz. Nothing less than i20.  :victory:

...and they stopped selling that new a couple of years ago! We do get the Kia Picanto though (which is a I think an i10 Clone)  :cool:
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I too get this diesel hunting from time to time on cold starts initially thought one pot not heating but no. seems to be a diesel fuel issue or rather something in the diesel, fires fine when hot runs great terrific economy. diesel conditioner - stabilizer cures the issue but it comes back when the conditioner mix thins out. Doesn't seem to occur on truck diesel only the car - highway fuel.
noel   

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Thanks Noel.

The dreaded diesel bug!  :fum:
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Collected tonight, very disappointed!

Cold start problem still there.

Also asked the garage to investigate a gearbox/ clutch clunk as well as to repair the rear wiper (which doesnít spray any fluid) and to fit a trim to the window that was missing when we bought it.

None of the above had been done!

Considering rejecting the car but might give them one more attempt at fixing it.
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Collected tonight, very disappointed!

Cold start problem still there.

Also asked the garage to investigate a gearbox/ clutch clunk as well as to repair the rear wiper (which doesnít spray any fluid) and to fit a trim to the window that was missing when we bought it.

None of the above had been done!

Considering rejecting the car but might give them one more attempt at fixing it.

I'm a fairly easy going guy, but situations like this really push my buttons. Talk to somebody senior there and say look at it from my point of view. I have 4 issues on my "new" car. I leave it with you guys and nothing fixed!!  :crazy1: 0/10  :fum:
  • MY18 PD SR & 2014 1.6 GDi Tourer (Prev had 2008  i30 CRDi & MY11 Petrol CW)

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One of the luxuries of living in Oz. Nothing less than i20.  :victory:

...and they stopped selling that new a couple of years ago! We do get the Kia Picanto though (which is a I think an i10 Clone)  :cool:

Kia  :spitty: Im not surprised, even the name is rubbish.  :rolleyes:
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Collected tonight, very disappointed!

Cold start problem still there.

Also asked the garage to investigate a gearbox/ clutch clunk as well as to repair the rear wiper (which doesnít spray any fluid) and to fit a trim to the window that was missing when we bought it.

None of the above had been done!

Considering rejecting the car but might give them one more attempt at fixing it.

I'm a fairly easy going guy, but situations like this really push my buttons. Talk to somebody senior there and say look at it from my point of view. I have 4 issues on my "new" car. I leave it with you guys and nothing fixed!!  :crazy1: 0/10  :fum:

 :whsaid:

Mate they are just stuffing you around.  I would also question the "senior" about his industry experience, is this problem beyond his ability? If not, why hasn't the car been fixed?
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