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View Full Version : o2 spiking, need advice


bmxer882x
12-09-2014, 10:11 AM
Car is a redtop sr20.
At idle when warm only the o2 voltage is .44-.45 and every 10 seconds or so it will spike to 1.28 and then the car will bog down.
When the voltage spikes my wideband goes from 14.0 afr down past 18 (as far as my gauge reads). It will slowly stabilize down to 14 afr and as soon as it hits it again the voltage will spike and go lean again.

It also runs lean at cruising. Don't have anyway to check o2 voltage while driving tho. wot and acceleration is fine.

If i unplug the o2 my idle sits at 12.7 afr and purr's forever. No hesitations or anything like that.

Any ideas on what could cause this issue? It all started when i swapped turbos, injectors, to a z32 maf and a brand new 02.

Things i have replaced or checked
new o2
tps voltage at .45
no vac leaks
no boost leaks
tune is good
o2's ground ohm'd out at 0
maf was swapped with a friends same thing
Hotwired fuel pump
Coils swapped no issues

Thats all i can think off.