I have a 98 Jdm b16b in a 2000 Civic, I'mRuning a p61 ecu ( Obd1 Gsr ) After dyno tuning my car and getting the fuel ratios and timing map just right, I'm still getting engine code 67 ( low cat. effeciency) Why????

I'm runing a Holley 255 fuel pump, AEM fuel Rail, 450cc injectors and my pressure regulator is set at 39 when in normal operation temp! I Have a test pipe and my cam breather line is not connected to my cold aire intake!

Need help or need to know where to look???

Thanks Pat

 

having any o2 sensor codes pop up at all?

 

No just 67???

 

i had this code once on my stock ex motor. What ecu are you running? i got a high flow cat and had a 02 bung made for it. that fixed it, good luck.

 

it's a p61 ( 93 GSR) and I have a test pipe with a bong for A/F tuning!