Originally Posted by isaiah990 (Post 3286102)

I have a 2013 FR-S, right side of engine near cylinder 4 engine shakes and rattles ECU is throwing P0354 and P0304
Engine is also making a weird noise near the right side of engine
-I've replaced ignition coils and spark plugs on cylinder 4 with no luck, any ideas what it could be?
I've noticed the coil pack does not sit completely flush when plugged on, is it supposed to sit tight and flush against the engine/spark plug?

Originally Posted by humfrz (Post 3286106)

Hello isaiah990 and welcome to our forum - :clap:

Happy holidays!

So, your car is acting up. Do you have any power mods?

You replaced the #4 plug and coil.

I reckon the coil should fit snug onto the spark plug. Is it fitting differently than the other coils? You might try swapping a couple of the coils to see if the engine code changes.

After that, I'd suggest you disconnect the battery for a spell, hook it back up and see if any codes come back.

The next easiest thing to check would be to check for a vacuum leak.

I hope you get it sorted out.


humfrz

Originally Posted by JD001 (Post 3286108)

You feeling okay? I thought diesels sound like that.. get a petrol if wanting something a bit more civilized..

Happy holiday.. BTW, I bet the sand helped with the digestion.... A bit of grit is good for the gut...

Originally Posted by isaiah990 (Post 3286446)

The noise seems to come in low idle after about 15 seconds of my car warming up

Originally Posted by tomm.brz (Post 3286447)

after 15 more or less seconds the only things that can change are:
-direct injectors goes on and port injector goes off
-oil circulates into the AVCS and activates it

Originally Posted by tomm.brz (Post 3286447)

after 15 more or less seconds the only things that can change are:
-direct injectors goes on and port injector goes off
-oil circulates into the AVCS and activates it

Originally Posted by isaiah990 (Post 3286450)

Thanks for your reply, I was thinking it could be the injectors, would that cause a code p0354 or somehow affect the coil pack? I’ve unplugged the cylinder 4 coil pack ignition D while the car was running but it did not change anything so I’m not sure if it’s the coil pack or injectors causing it. I’m trying to get this fixed asap hopefully before New Years but I’m having trouble diagnosing the problem

Originally Posted by Stomachbuzz (Post 3286483)

I disagree. As far as I know, there are several events that take place when a motor is cold that change/stop happening later on.

As you said, at some point, the injection method switches, and the 'crickets' can be heard.
Not sure about the AVCS as I'm not familiar with that.

Modern cars also have a secondary air injection (kinda sounds like a jet engine, but not as loud unless your air pump is going bad) for about ~90 seconds when a car is cold.
There are a few other processes that change as well, and you can clearly hear the idle change sound and speed throughout the process.



Yes, I can hear the miss. This type of engine should not have an idle that is so choppy.
I am also concerned about that metal rapping sound. It's an accessory, I'm sure, but still distracting in the video. These types of sounds never show up well in video recordings.

The why you start diagnosis with ignition problems is to start switching the coils around.

Computer says cyl#4 misfire?
Swap cyl#1 ignition coil with cyl#4 ignition coil and see if the code follows over to cyl#1 or stays at #4.

Obviously, this is assuming that the coils are properly installed, and there isn't a glaring issue such as debris in the spark plug hole (maybe why your ign coil isn't seating properly?) or other.