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#1 Old 01-16-2013, 03:12 AM
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Engine noise in low RPM

Hello Guys,

I noticed some small crackling sound when the engine is accelerating in low RPM. Just recently went to hyundai service center for 10k km check and told them the problem. They said that it was the worn out stabiliser bushing problem that made the noise. Unfortunately, I need to wait for the extended warranty approval to replace the stabiliser part. Also it was the car's tune up so they replace the spark plugs. After checking i noticed that the noise was slightly gone. Although I'm still hearing some noise but not that much. And then just yesterday, the problem came back. More noise again when accelerating in low RPM. My question: is the stabiliser really causing the engine noise problem?? Or service mechanic just overlooked the problem?

Thank you for replies.

Regards
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#2 Old 01-16-2013, 02:22 PM
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Quote:
Originally Posted by jobert21 View Post
Hello Guys,

I noticed some small crackling sound when the engine is accelerating in low RPM. Just recently went to hyundai service center for 10k km check and told them the problem. They said that it was the worn out stabiliser bushing problem that made the noise. Unfortunately, I need to wait for the extended warranty approval to replace the stabiliser part. Also it was the car's tune up so they replace the spark plugs. After checking i noticed that the noise was slightly gone. Although I'm still hearing some noise but not that much. And then just yesterday, the problem came back. More noise again when accelerating in low RPM. My question: is the stabiliser really causing the engine noise problem?? Or service mechanic just overlooked the problem?

Thank you for replies.

Regards
It's difficult to put noises into print, but your "Crackling" might be what i would decribe as a rattling/Tinkling when the engine gets pushed at low revs.
I heard it on my i10 Auto within days of getting it, & my old ears recognised it as "pinking" (Lead used to reduce it).
Pinking was caused by Ignition timing being out, or poor low octane petrol being used when high octane was req'd. Also in those days a 10,000 mile decoke & Valves being reground may be req'd. But that was years ago. And with modern cars i had all but about forgotten about pinking.

But allthough my Auto gearbox is excellent there are times when going uphill, loaded in low revs i get "pinking". If i floor the accelerator to make it drop down a gear then ease up the pinking is gone.

Pinking can damage the engine, but i drive lightly to try to keep my fuel consumption up as high as 30mpg when i'm lucky. So i don't often get it & when i do i get out of that particular rev band.

It makes me wonder if bad ignition timing is responsible for my bad fuel consumption, but i was told with modern cars you don't get bad timing because of electronic engine management, but i don't know, a better brain than mine will have to think this one out.

But i am sure Joberts noise is the same as mine ie "Pinking", & when it went for service the timing was adjusted somehow & that is why the noise is a little less.

Does anyone else hear this noise? & if so are they among those of us who get bad consumption? How about you Jobert?

Drivers like us with auto' may experience it more as we have one less gear to play with, so we could end up in low revs under pressure, before it drops down.
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#3 Old 01-16-2013, 05:11 PM
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If Joberts or oldbugga's noise is actually "pinking" or (also known as" "dieseling", yes in fact is a condition that happens when the spark timing is off by some degrees.

It sounds like a diesel engine just at the power pick up from low revs, or it can be described as "a metallic rattling". It is usually worse at sea level and tends to disappear when driving at high altitudes (mountains) above 1500 meters above sea level.

Todays engines take care of the spark advance (timing) by the information given by the "knock sensor". If the knock sensor fails, the spark timing may be off to a point that "dieseling" may show.

This can damage an engine in short time.

BTW, the noise comes from the fuelair mix igniting (getting the spark) before its needed timing when the piston is about to reach top position. Scanning the car may show the corresponding error code, which in Hyundai is P0325.

Robert B.

Don't forget to participate and vote in the February 2013 ROTM thread at http://www.hyundai-forums.com/249-ri...2013-rotm.html
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#4 Old 01-16-2013, 06:03 PM
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Quote:
Originally Posted by RBURGOSS View Post
If Joberts or oldbugga's noise is actually "pinking" or (also known as" "dieseling", yes in fact is a condition that happens when the spark timing is off by some degrees.

It sounds like a diesel engine just at the power pick up from low revs, or it can be described as "a metallic rattling". It is usually worse at sea level and tends to disappear when driving at high altitudes (mountains) above 1500 meters above sea level.

Todays engines take care of the spark advance (timing) by the information given by the "knock sensor". If the knock sensor fails, the spark timing may be off to a point that "dieseling" may show.

This can damage an engine in short time.

BTW, the noise comes from the fuelair mix igniting (getting the spark) before its needed timing when the piston is about to reach top position. Scanning the car may show the corresponding error code, which in Hyundai is P0325.
Sounds about right, now if the Spark Timing is out not only would we get the noise, Pinking,Rattling,Diesel Knock, bad timing also adversley affects fuel consumption!!!!

So owners with poor consumption please listen to your engines when accelerating from low or very low revs under load (uphill etc)
if it rattles etc please let us know.

Now i'm not familiar with modern engines, so does the car retain a record of the error code P0325? As i doubt it would show under workshop conditions.
& what is the cure? is it simply a sensor that is changed or the whole engine management panel, i guess there would be one.
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#5 Old 01-16-2013, 11:24 PM
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try using premium gasoline with octane rating of 95 or 97. you will notice that the pinging sound is lesser or at best gone.
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#6 Old 01-17-2013, 10:29 AM
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Quote:
Originally Posted by oldbugga View Post
Sounds about right, now if the Spark Timing is out not only would we get the noise, Pinking,Rattling,Diesel Knock, bad timing also adversley affects fuel consumption!!!!

So owners with poor consumption please listen to your engines when accelerating from low or very low revs under load (uphill etc)
if it rattles etc please let us know.

Now i'm not familiar with modern engines, so does the car retain a record of the error code P0325? As i doubt it would show under workshop conditions.
& what is the cure? is it simply a sensor that is changed or the whole engine management panel, i guess there would be one.
Quote:
Originally Posted by jamiz View Post
try using premium gasoline with octane rating of 95 or 97. you will notice that the pinging sound is lesser or at best gone.
The knock sensor can be easily replaced. It is usually bolted to one side of the engine block. I do not have the specifics for your engine, but all are very similar. At worst case scenario, something must be removed (like exhaust manifold, etc) to be able to reach the knock sensor.

The error code will be stored if the "causing conditions" persist. If the knock sensor is replaced, then the error code will clear itself after a few "start-run-off" cycles.

Have in mind that sometimes the knock sensor may be OK, but its wire or connector got loose, frayed or broken somehow.

Of course, changing to higher octane fuel may reduce the problem, but this is not the solution, as the knocking will continue but only to a reduced level. The ECM is perfectly able to handle "regular" fuels (86 to 89 octane) without problems. The spark advance is adjusted accordingly, buy only if the knock sensor is working properly.

Robert B.

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#7 Old 01-27-2013, 04:18 AM
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Hi jobert21, there is a Technical Service Bulletin (TSB ) issued by Hyundai for this problem last year.

I had a similar problem in India - own a 1.2 Kappa2 AT. There is a noticeable lugging/rattling/pinging sound at low RPM while climbing up a slope. Gets exacerbated with the AC switched on. Almost as if it were a manual car labouring up a slope at low speeds in 3rd gear.

I spoke to Hyundai Customer Care who asked me to visit the dealership. I was told that Hyundai had issues a TSB for the exact same issue and they reflashed the ECM through the OBD port. Took exactly a couple of minutes and presto, the sound vanished as if it never existed.

Another story that it again came back after 11 months. But again, flashing cured it.

Do speak to your A.S.S. and ask them about the TSB - I remember the email clearly says ""this fix improves the knocking of the engine between 30-50kmph" and if there is still a bit of the sound, I believe the spark plugs need to be changed as well.

Hope this helps! I think the 'stabilizer' story is complete BS - would be true if you're experiencing creaking sounds only over undulations like speed humps/dips.

Quote:
Originally Posted by jobert21 View Post
Hello Guys,

I noticed some small crackling sound when the engine is accelerating in low RPM. Just recently went to hyundai service center for 10k km check and told them the problem. They said that it was the worn out stabiliser bushing problem that made the noise. Unfortunately, I need to wait for the extended warranty approval to replace the stabiliser part. Also it was the car's tune up so they replace the spark plugs. After checking i noticed that the noise was slightly gone. Although I'm still hearing some noise but not that much. And then just yesterday, the problem came back. More noise again when accelerating in low RPM. My question: is the stabiliser really causing the engine noise problem?? Or service mechanic just overlooked the problem?

Thank you for replies.

Regards
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#8 Old 01-27-2013, 09:54 AM
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Originally Posted by d_himan View Post
Hi jobert21, there is a Technical Service Bulletin (TSB ) issued by Hyundai for this problem last year.

I had a similar problem in India - own a 1.2 Kappa2 AT. There is a noticeable lugging/rattling/pinging sound at low RPM while climbing up a slope. Gets exacerbated with the AC switched on. Almost as if it were a manual car labouring up a slope at low speeds in 3rd gear.

I spoke to Hyundai Customer Care who asked me to visit the dealership. I was told that Hyundai had issues a TSB for the exact same issue and they reflashed the ECM through the OBD port. Took exactly a couple of minutes and presto, the sound vanished as if it never existed.

Another story that it again came back after 11 months. But again, flashing cured it.

Do speak to your A.S.S. and ask them about the TSB - I remember the email clearly says ""this fix improves the knocking of the engine between 30-50kmph" and if there is still a bit of the sound, I believe the spark plugs need to be changed as well.

Hope this helps! I think the 'stabilizer' story is complete BS - would be true if you're experiencing creaking sounds only over undulations like speed humps/dips.
Hi d himan,
Thanks for the above info, i shall mention this when i take my i10 auto in for it's 18 month check.
Hopefully it may stop the occasional low rev rattling (Pinking).

Can i ask you, did you experience bad fuel consumption during the period you had the problem?

And did the mpg figures improve after the "Flash/Cure" ?

I ask as i am still looking for a reason as to why some of us get poor mpg (30mpg) while others such as i20 owners seem to get 40 - 50mpg!

If the Rattling is because of timing being out, this could cause bad fuel consumption.
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#9 Old 01-29-2013, 09:28 AM
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Quote:
Originally Posted by oldbugga View Post
Hi d himan,
Thanks for the above info, i shall mention this when i take my i10 auto in for it's 18 month check.
Hopefully it may stop the occasional low rev rattling (Pinking).

Can i ask you, did you experience bad fuel consumption during the period you had the problem?

And did the mpg figures improve after the "Flash/Cure" ?

I ask as i am still looking for a reason as to why some of us get poor mpg (30mpg) while others such as i20 owners seem to get 40 - 50mpg!

If the Rattling is because of timing being out, this could cause bad fuel consumption.
Yes - makes sense to get this done. The dealer could ask the company to contact Hyundai Motors India in case they aren't certain. Do shout in case of any help!

Post the flash,
1. The engine became noticeably smoother in the 3000-5000 RPM range.
2. MPG did increase, albeit only marginally for me. My car's usage is a tough bumper to bumper crawling commute.
3. The i10 AT mileage is generally lower than comparable cars - has a bad reputation in India as well.

As mentioned earlier, the issue came back after 11 months and I again had to do a re-flash. I'll report in case there's any MPG improvement!
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#10 Old 01-29-2013, 09:59 AM
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Incidentally, I was in Malaga/Costa De Sol in December 2012 and the roads were superb! You should be seeing at least 35 mpg with a light throttle if the roads are similar!
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