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Discussion Starter · #1 ·
I have problem chatter noise when press gas. This problem only happen when car have load.
On neutral gear this noise not present. i also try rev until cut but this noise not present.

when this noise come hondata flashpro will register knock. it only register on piston 2 and 3. other piston show 0 knock.
knock level very low.

i already done valve clearence
LMS inspection all good
compression test all piston 200 psi

this is my noise on my car.

i record using microfon. I put on vtc filter cover.

My target next is timing chain and TCT.
But during valve adjustment it not show any miss gear. Timing chain also not show any play or loose.

Kindly please share what can cause this problem.
 

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Very interesting noise. Does your data show any type of misfire? And does it sound like its more in the top end or bottom end? Maybe its just my speakers but it kinda sounds like an ignition system arcing.
 

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Discussion Starter · #4 ·
noise come from top end. because I try record bottom engine noise not very loud.
place i record
oil baffle
Timing chain tensioner cover
Transmission
head cover
exhaust
injector

when i record on vtc area noise clearly visible.
 

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97 civic HX K24a
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noise come from top end. because I try record bottom engine noise not very loud.
place i record
oil baffle
Timing chain tensioner cover
Transmission
head cover
exhaust
injector

when i record on vtc area noise clearly visible.
Have you considered the vtc gear itself to be the culprit ?
 

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Discussion Starter · #7 ·
Very interesting noise. Does your data show any type of misfire? And does it sound like its more in the top end or bottom end? Maybe its just my speakers but it kinda sounds like an ignition system arcing.
thank you sir
i will check on ignition next.
On cold start it behave like misfire. it make pop2. But when engine hot it smooth. But it not show any error. i also scan ECU and it show zero error.
On hondata flashpro also not show any error.
 

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97 civic HX K24a
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Maybe check the cam angles while it’s running and see what the vtc is doing when you hear the noise ? Although I’m pretty sure idle should be at 0 or very low degree.
 

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Discussion Starter · #10 ·
Maybe check the cam angles while it’s running and see what the vtc is doing when you hear the noise ? Although I’m pretty sure idle should be at 0 or very low degree.
yes sir on neutral it show 0 degree. if valve clearence to tight can it make noise.
My engine stock k20z4
i adjust valve clearence following factory recomended.

intake 0.008 inch
exhaust 0.010 inch
103795
 

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Hi Aryeff, did you manage to find the culprit to your problem ?

I have the similar rattling sound under the below condition :
  • In high gear
  • Engine RPM around 1.5K to 2K
  • mid level throttle / pushing it abit more but not till it downshifts
  • Ignition timing is around +10 degrees when this happens (Have a OBD gauge with live data)
  • In short, when engine is under load / high gear ..
The rattling frequency doesn't vary with RPM and doesn't occur besides the condition above.

Have recorded an audio clip with a mic in the engine compartment (near the timing chain cover area), look out the "rattling sound" from 28sec to 34sec of the clip.

Audio Clip : Audio

Could you listen & confirm if we are hearing the same annoying rattle ? :)
 
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