RB26 fluctuating idle/AFR, bad O2 sensors?
Posted: Tue Dec 26, 2017 6:19 pm
Hey everyone,
Recently I installed a Nismo collector and Nismo 555cc injectors on my RB26DETT. I resized the injectors and installed a LC-2 wideband to monitor my AFR. I read on the forums that I was to take the injector latency (710) and times it by 2 (so 1420). I could not get the car to idle properly and found my AFR was at 9.9 to 10.2. No matter how much I adjusted my K constant and TIM the car would not improve. Well I had to drive the car regardless of this issue due to work. It ran, okay.
Now I have found out that I was not to times the injector latency by 2 and only entered 710 to the program. The car runs much better (AFR around 14.2 to 14.9) but that is just the problem. It will not settle and has a noticeable idle issue. It only jumps approximately 50 RPMS, but the health of the engine can be felt as unstable. This unstable AFR cannot be fixed no matter what I adjust. To include the LHS o2 jumps from 0.1 to 1.25 sporadically and RHS o2 is stays at 0 (idk if this is suppose to work as the RB has 2 o2 sensors). Also my AAC sits at 10% once at temp and the timing jumps from 20, 21, 22 degrees with the change in the idle. I do not know if this is because of the o2 sensor being bad and/or fouled plugs.
Could the overall issue be because I drove the car extremely rich for 30 minutes (I know that was a terrible thing but had no choice) and I fouled the plugs and both O2 sensors? Or is it my timing map (which I feel does not need to be adjusted)? The timing cells for my idle read below. Do I need to adjust that 25 to a smaller number to fix this maybe?
20 25
20 20
Recently I installed a Nismo collector and Nismo 555cc injectors on my RB26DETT. I resized the injectors and installed a LC-2 wideband to monitor my AFR. I read on the forums that I was to take the injector latency (710) and times it by 2 (so 1420). I could not get the car to idle properly and found my AFR was at 9.9 to 10.2. No matter how much I adjusted my K constant and TIM the car would not improve. Well I had to drive the car regardless of this issue due to work. It ran, okay.
Now I have found out that I was not to times the injector latency by 2 and only entered 710 to the program. The car runs much better (AFR around 14.2 to 14.9) but that is just the problem. It will not settle and has a noticeable idle issue. It only jumps approximately 50 RPMS, but the health of the engine can be felt as unstable. This unstable AFR cannot be fixed no matter what I adjust. To include the LHS o2 jumps from 0.1 to 1.25 sporadically and RHS o2 is stays at 0 (idk if this is suppose to work as the RB has 2 o2 sensors). Also my AAC sits at 10% once at temp and the timing jumps from 20, 21, 22 degrees with the change in the idle. I do not know if this is because of the o2 sensor being bad and/or fouled plugs.
Could the overall issue be because I drove the car extremely rich for 30 minutes (I know that was a terrible thing but had no choice) and I fouled the plugs and both O2 sensors? Or is it my timing map (which I feel does not need to be adjusted)? The timing cells for my idle read below. Do I need to adjust that 25 to a smaller number to fix this maybe?
20 25
20 20
