Misfire at Idle? No CEL. Please help video attached!
 

Hello Guys,
I've experience this since last week, whenever I am in idle, cold startups, parked I hear something. pompp.. pohhhmp poohmp. poohhm. totally random.

Not noticable but still I can feel it. and car vibrates very very little. whenever there is a pohmmp random sounds.

Ive searched in any forums found some answer and said might be a carbon buildup in valves, bad sparks plugs, Direct injection issues, or bad coils.

Here is the similar video.
https://youtu.be/aMI5vxVwpZs


Car is pure stock, No CEL.
Does anyone experienced this and how did you solved it?

Could be lots of things.

Can you log misfire counts per cylinder ?

It it only at idle

Is the car 2012 or 2013 model ? has it had ecu reflash for rough idle ?

has car been serviced regularly , has it had upper engine cleaner used at service intervals
https://www.ebay.com.au/itm/1-X-NEW-...UAAOSwP4dazaG-



could be bad fuel, spark plugs coil packs , start of DI injector problems

Car is 2014, service regularly, Last serviced last week @90k kms. They put injector cleaner for additional $30.
I don't have a tool to count misfire counts.
I can hear only in idle, parked and drive but not moving. once car is moving it runs perfectly.

I hear bad things about dumping injector cleaner in the gas tank. Besides, gas has injector cleaner built into it, so I think you should consider the DI injector seals or something else as a culprit over built up carbon deposits.

Is that an easy fix? Or need to spend some dime?

I did mine. They weren't hard. Just time consuming. Check my build.

Great build, If what do you think is the poohmp sounds?

UP

Is the sound coming from the engine bay or the exhaust?

Noticable in exhaust. but I change my stock to N1, still pohhmp sounds coming.

The car retards a ton of timing on that cold start initial idle. Could result in the noises you're hearing from the exhaust. @steve99 ?