Weird Idle and rough drive

[Kydo1699]

Hey guys, I have a 2020 civic si and I have been having some issues with it. I kind of have a rough idle and rough drive from idle to around 3000 rpm after that it gets smoother.
Here are the mods I have:
Catless fp/dp
PRL race short ram intake
tsp stage 1 on ktuner
Rear motor mount
Remark exhaust

Things I have tried:
Put in the stock air filter
Put the stock tune back on
Changed the spark plugs

Took it to a shop and they could not figure it out, still having that same issue! Here is a video of how it sounds. Any ideas on what it could be?

Also, if you guys could check out my YouTube channel and subscribe if you like.
ClassicKydo

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[Edcalgarian]

I had a similar issue but I'm completely stock. I cleaned the MAF and it fixed it for me.

 

[Kydo1699]

I had a similar issue but I'm completely stock. I cleaned the MAF and it fixed it for me.

How do you clean it?

 

[Edcalgarian]

How do you clean it?

MAF cleaner from an auto parts store

 

[Kydo1699]

MAF cleaner from an auto parts store

I am going to give this a try, thank you

 

[amirza786]

Making a guess, I would say it's your Rear Motor mount. The bushings are Polyurethane, which is much harder than rubber and way less pliable. Although it is stronger as a MM, it also allows NVH to travel from the engine to the frame. Last year I Installed Polyurethane Lower Control Arm bushings on my IS350, after that I could feel almost every imperfection in the road, and lots of noise and vibration. I switched them out for RCF LCA bushings which are harder than OEM but not as hard as Poly, and the road vibrations and additional NVH went away. Different parts, same principle.

Anyway, that's my best guess

 

[Kydo1699]

Making a guess, I would say it's your Rear Motor mount. The bushings are Polyurethane, which is much harder than rubber and way less pliable. Although it is stronger as a MM, it also allows NVH to travel from the engine to the frame. Last year I Installed Polyurethane Lower Control Arm bushings on my IS350, after that I could feel almost every imperfection in the road, and lots of noise and vibration. I switched them out for RCF LCA bushings which are harder than OEM but not as hard as Poly, and the road vibrations and additional NVH went away. Different parts, same principle.

Anyway, that's my best guess

I would agree with you but I had this motor mount for a long time now and this issue just started a few days ago. Thanks for the response!

 

[xXoVrKiLLXx]

Had a similar issue flashing my ECU. It was a reflash (Im using Hondata flash pro) and I didn't wait long enough for it to finish before I started the car. Flashed it again and waited 5 seconds after it it was done turned the car off, then started like normal and was fine and have been since. Had me a little worried. Sounded like my old STi when i started it lol.,

 

[amirza786]

I would agree with you but I had this motor mount for a long time now and this issue just started a few days ago. Thanks for the response!

Could be something changed in your setup that is causing a rougher Idle that you would not normally feel as much. With the DP/FP you should consider a custom tune, and not the canned TSP tune. I'm still leaning to your RMM, but again I'm just guessing

 

[kshawn]

Could be injectors. Post your fuel trim numbers

 

[Kydo1699]

Could be injectors. Post your fuel trim numbers

I use tuner view what would that be called on there?

 

[Kydo1699]

Could be injectors. Post your fuel trim numbers

 

[kshawn]

Fuel looks good

 

[Kydo1699]

Fuel looks good

Any other ideas?

 

[kshawn]

Maybe try reflashing the tune and a idle relearn. Disconnect the battery for like 30 min and let it idle up to temp.

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