Nissan 370Z Forum - View Single Post

Gooch · 03-11-2021, 01:00 AM

Hi there,

2015 Nismo 6MT BP single kit, Motordyne exhaust, open dumps, stock block, ID 1050cc injectors, 340lph pump, s1.e fuel return, remote tuned by Seb @ 12psi. 33,000 miles, about 8000 on the turbo kit. For the first few months, car ran perfectly. Then, overnight, my aftermarket AFR gauge starting reading about 1 unit richer at idle. The weird thing is, the oem sensors still read 14.7. I thought no problem, the oem sensors went bad. I replaced those and the problem remains. Then I thought it was the aftermarket gauge. I replaced all the wires, sensor, gauge, module, and the problem remained. You can definitely smell the extra gas. At WOT, the afr is also richer but is within acceptable values. (10.5-11.5). Another symptom, when cruising, and letting off the gas, about half the time when coming back into the gas, the cruising afr is super rich at about 12:1 for 20-30 seconds before normalizing back to 13.5-13.7.

The car is still lightning fast and if it werent for the afr reading itself, and the smell, you would never know anything is wrong. But I figure it’s time to get to the bottom of this before things get too fouled. If anyone has any ideas before I throw more parts at it I would appreciate it. Thanks

03-11-2021, 01:00 AM	#1 (permalink)
Gooch Base Member Join Date: Nov 2016 Location: Washington State Posts: 69 Drives: 15 370z 6MT Nismo Rep Power: 9	AFR problems Hi there, 2015 Nismo 6MT BP single kit, Motordyne exhaust, open dumps, stock block, ID 1050cc injectors, 340lph pump, s1.e fuel return, remote tuned by Seb @ 12psi. 33,000 miles, about 8000 on the turbo kit. For the first few months, car ran perfectly. Then, overnight, my aftermarket AFR gauge starting reading about 1 unit richer at idle. The weird thing is, the oem sensors still read 14.7. I thought no problem, the oem sensors went bad. I replaced those and the problem remains. Then I thought it was the aftermarket gauge. I replaced all the wires, sensor, gauge, module, and the problem remained. You can definitely smell the extra gas. At WOT, the afr is also richer but is within acceptable values. (10.5-11.5). Another symptom, when cruising, and letting off the gas, about half the time when coming back into the gas, the cruising afr is super rich at about 12:1 for 20-30 seconds before normalizing back to 13.5-13.7. The car is still lightning fast and if it werent for the afr reading itself, and the smell, you would never know anything is wrong. But I figure it’s time to get to the bottom of this before things get too fouled. If anyone has any ideas before I throw more parts at it I would appreciate it. Thanks __________________ '15 370z Nismo Tech 6MT Magnetic Black, V2 BP Kit 6467 Unexploded Turbo \| '06 350z Touring 6MT Carbon Silver