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16 replies to this topic | 12 praises

#1

Posted 07 May 2015 - 11:19 PM

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hi,

 

have a problem today. hope you guys know what it is. kia forte 1.6sx of 5 years and 4 months old, 77Kkm mileage. 

 

Today the car jerks at idle at red light, and i can see that RPM slight jumps up and down, like 400rpm - 700rpm. Usually it is idle at 400rpm without up and down. The jerk is about every 4 seconds, not constant jerking. can feel the car tremble.

 

When i press the throttle to accelerate during travelling, the car will jerk again, and does not accelerate instantly as normal. after a while it accelerates to a higher cruising speed, then it's OK again. During jerking, the engine light flashes like 10 times. when the jerk stops, engine light becomes off again. I just changed engine oil and engine filter 2 months ago.

 

Is this worn spark plugs, or ATF due to change (coz it's been a while), or both, or something else? 

 

Thanks.



#2

Posted 07 May 2015 - 11:39 PM

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scan for code first will be the fastest 



#3

Posted 07 May 2015 - 11:47 PM

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Could possibly be due to spark plugs or high tension cable needs to be replaced.
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#4

Posted 08 May 2015 - 12:04 AM

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yes, plugs/ignition coil/cable should be checked first...

 

A OBD scan should pin point the exact problem.  Buy one from here and download a smartphone apps:

 

http://deals.dx.com/team.php?id=13506

 

 


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#5

Posted 08 May 2015 - 07:56 PM

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I'm not very experienced, but it does sound like a misfire.



#6

Posted 08 May 2015 - 08:36 PM

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Guess work is only good for symptoms common to a model.

 

Use OBD to isolate first. Go to workshops with the right tool.

 

 



#7

Posted 08 May 2015 - 08:46 PM

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My car started shivering today.
Diagnosis - ignition coil.

#8

Posted 08 May 2015 - 08:52 PM

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Yeah. I also think it's misfiring. Worn spark plug won't activate CEL.


The chosen one will bring balance to the Force...I mean Singapore. Even star wars do not reserve "the chosen one" to a sith lord or a jedi or a wookie.

#9

Posted 08 May 2015 - 09:57 PM

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Maybe MAF sensor faulty or dirty

#10

Posted 09 May 2015 - 06:55 PM

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Buy a cheap OBD2 bluetooth adapter from Dealextreme, I got one from them as well and it works great. For engine codes you can google them to get a better idea of what they mean as some code names are not clear.



#11

Posted 09 May 2015 - 07:52 PM

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Blinking check engine light usually due to misfiring...
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#12

Posted 10 May 2015 - 03:09 PM

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it is misfiring from the code. initially p0300. but after changing coil and spark plugs, it still has misfiring with p0302. 2nd cylinder misfiring. just hope it is not something seriously bad and will have to spend a bomb. still yet to diagnose what exactly it is.



#13

Posted 13 August 2017 - 05:26 PM

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it is misfiring from the code. initially p0300. but after changing coil and spark plugs, it still has misfiring with p0302. 2nd cylinder misfiring. just hope it is not something seriously bad and will have to spend a bomb. still yet to diagnose what exactly it is.

Hi.. do u still remember at the end what is the cause?
I am experiencing the same issue on my ride.
disclaimer: no real person living or dead involved on production of above.

#14

Posted 24 October 2017 - 02:08 PM

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Hi

Need help
There is this roaring sound from engine compartment when car move off from stationary sounded very rough.
Normally about 2000rpm onwards.
When ok highway which rpm is normally below 2000 there is not significant sound.

This roaring sound will sometimes disappear and it will be smooth like baby but most of time it is around.

Abit like modified exhaust sound but my car is stock.

When in neutral and accelerate there is no sound thus engine should be fine and exhaust not leaking.

Honda vezel 2015, 60k mileage

#15

Posted 27 October 2017 - 12:38 PM

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Hi

Need help
There is this roaring sound from engine compartment when car move off from stationary sounded very rough.
Normally about 2000rpm onwards.
When ok highway which rpm is normally below 2000 there is not significant sound.

This roaring sound will sometimes disappear and it will be smooth like baby but most of time it is around.

Abit like modified exhaust sound but my car is stock.

When in neutral and accelerate there is no sound thus engine should be fine and exhaust not leaking.

Honda vezel 2015, 60k mileage

 

Let me make a wild guess , likely a worn bearings from the drive train.

Could be ac compressor , tensional pulley , alternator ....
 



#16

Posted 27 October 2017 - 03:39 PM

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Let me make a wild guess , likely a worn bearings from the drive train.
Could be ac compressor , tensional pulley , alternator ....

I was guessing the drive train bearing, is it normally located along the moving shaft linked to the wheel bearings? I notice my wheel bearing is also a bit wear out. But weird that the sound only appears when I accelerate

#17

Posted 27 October 2017 - 04:38 PM

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I was guessing the drive train bearing, is it normally located along the moving shaft linked to the wheel bearings? I notice my wheel bearing is also a bit wear out. But weird that the sound only appears when I accelerate

 

From pass experience , roaring sound that comes n go (intermittent) normally caused by bearing.

Get it check by experienced mechanic.
 




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