I just pulled out filters and cleaned, they where slightly dirty not entirely clean buy slightly .

 

Not very dusty in Miami ...

 

Oh I see.

 

That's really odd that you would have this issue. I just got an ARK exhaust installed as well and seem to have a similar issue. When I am driving and push the clutch in to coast down a hill or what not the RPM drops down quickly to around 500-600 and then quickly hops up to 1100-1200 drops down to 500-600 again and then back up to 1100-1200. It does this quite a few times before it finally settles down at around 800 rpm.

I've only got 16000 miles on my car though so would my throttle bodies be dirty at this point?

Also, why would this issue only show up after installing a new exhaust?

 

Weird! Can you guys be losing too much back pressure?

 

My car does this too and i'm at 53K miles.

Been doin' it for about 10K miles just havent taken it in to the dealer yet since I think im going to try to clean the TB's first and see if that gets rid of it.

 

Gamedog, let me know if cleaning the throttle bodies fixes the issue for you. I'm going to check that myself as well and if it fixes it I'll post it as well.

 

I'm cleaning my TB Tommorow also ...

 

I cleaned my TB's tonight and the problem still exists. My TB's weren't exactly very dirty when I cleaned them anyway. I took a Cipher log of the issue. Here are a few screen shots.






If you look at the chart when the accelerator pedal is not pressed down at all you can see where there are the quick peaks and valleys in the other charts. That is where the RPM goes up and down.

I can send Cipher log file .csv if somebody wants to take a closer look at the actual data.

 

Wow. I just ordered some HKS Hybrid filters for my G and after reading this i am hesitant to install them. Can people that have this on their G chime in?

 

I have had HKS filters for over 15.000 miles with no issues what so ever I think these guys where running high boost or something to cause damage no sure but I have not noticed any cons about the filters , they have been reused after cleaning and still good.

 

I see. Do you oil them after or just wash and dry?

 

All those reviews seem to be about the HKS super-mega-flow intake filter kits, not the super-hybrid drop-ins. Obviously they're different products, but I'm not sure how different, or whether or not the hybrid filters would have better filtration. Looks like they're made of the same non-oiled foam material.

You aren't supposed to oil the HKS filters.

 

Anyone been able to figure out what this issue is yet? I'm still having this irritating hopping of the RPMS whilst driving and have yet to have anyone figure it out.

I took it to the dealer and they were like "It's probably your exhaust giving the ECU "weird" readings."

P.S.

I cleaned my throttle bodies and it didn't help any.