I realize that, but there was no cause for the slippage at the time the sputtering happened. Not to mention when I turn the VDC off, no more sputtering.

 

Brian,

Any idea on a fix for the hesitation / sputttering? I'm on the verge of going back to running stock cats. I can no longer stand this performance issue.
Please help.

 

if your looking to get rid of them ill take them off of your hands

 

dude i have the same problem your having!! today on my way to work i got an engine check light. i have berk cats and other **** then got a reflash. after that i got the injen intakes. i took my exhasut off anf i'm waiting for another one. gona go to autozone so they tell me what the light code it is

 

jason350z, reset your ecu. then let your car warm up to normal levels before you drive. then see if the cel comes on. or put some brillo stuffing in the hole before the 02 sensor.

 

Make me an offer i cant resist. By the way they're off a 2007 G35S sedan. Please confirm fitment.

 

NO CEL since day one.

Just the sputtering and hesitation. It seems to be hit and miss. Some cars don't have this issue with the same setup. What's wrong with ours?

 

i wish i knew. if i had more hr's here to work with it wouldn't be so bad. but those that have changed out around here have not had problems at all. i only had the problem when my cel was on. but since you are having it without a cel i would put the stock cats back on and see if it still does it. if it does then warranty will resolve the problem.

 

the shop i used to work at has a scan tool but ill be damned if i can remember what it is i borrow off top of my head. but it data logs. since the problem is not happening with our cars here i can't log any of the issues to see exactly what it might be.

 

ok this is what i have/had. i had the fast intensions intimidator exhasut, with berk metallic HFC, then i got a reflash by technosquare. i dont remember if i had the problem then. later on after the reflash i got injen dual intakes. then i sold my fast intensions exhasut and i have the stock exhaust on now.

i guess this is when i notice the problem in 6th gear if i'm rolling at 2000 its fine but if i press the gas pedal hard to pass a car or what ever then the car jerks. but i had never had a cell light and i've had the cats for like 4months. drove with them for like 3,000 miles.
now today it was a quick start and after like 10 miles of driving the engine light went on.
so i dont know man

 

ok went to autozone after work. the code i was geting was po3 p002 something like that anyways it said it was HFC. i dont know i drove like 2-3k miles never had a light. the only thing was that yesterday i didn't let the car warm up.

 

^ can you recall the exact code? Look in here to match it with an error code..

https://my350z.com/forum/engine-and-...y-helpful.html

 

yeah i wrote them down they were p0420 and p0430 according to the list u showed me they are this:
P0420 TW (Two-Way) Catalyst System, Bank 1
P0430 TW Catalyst System, Bank 2

 

yea that's the same code I got a few days ago. It's nothing serious..

It came up because I was keeping my car in high rpm's for a long period of time..ever since I reset the ecu and I have driven about 350 miles and it has not come back on..

 

i know but its annoying and i'm sure it will come back.
the only possitive thing about this was that i learned how to check the codes it was too easy and free. damn dealers try to charge me once 100 bucks to run diagnostics on my daily driver hyundai accent.

 

well so far so good. I have'nt had any bogging issues. But I dont know? I feel that when the car is at low rpm's and I floor it underload it seems slower until my RPM's go over 3500 or it's just me?

 

autozone will read your CEL codes for free???

 

they gave me the mashine to read it my self. its so easy man.


update about the hesitation when driving in 6th gear and tring to accelerate quickly.
well i bought a borla exhaust and installed it today and the hesitation is gone. i think its because my ecu was reflashed/tune for a dual exhaust and i recently i had reinstalled the stock exhaust. maybe that caused it i dont know but now that i have a higher flow exhaust its gone.

 

I've had the berks HFC as well as other members on there HR and most if not all get the stuttering around 2500-3k rpms in high gear and WOT.. Hopefully this lean nature of the HFCs installed does not create long term wear on the motor.

 

Any updates on fixes? I just ordered my Berk HFCs yesterday and after reading about all these issues.. am starting to second guess my decision. Quite paranoid now actually..