a/f gauge in 96-98 civic where do you connect the signal wire to? I hooked mine up to the primary heated oxygen sensor heater control wire on the ecu side under the dash at connector A32P. Is this correct? The gauge works but Imnot sure if this is correct. thanks!

 

bump.

 

NO, You don't mean pin A32 at the ECU pigtails right... Cuz if so you won't have any signal what so ever... There is nothing running out of that... For an OBD2a car you'll want to tap in at pin A5... (correct me if I'm wrong cuz it's been awhile since I wired any OBD2 **** up) If not it's A6.. A5 should be the primary oxygen sensor signal... You don't want to be tapped into the heater either... That won't work... But yea try that and let me know if something doesn't work... Good Luck

 

thanks, ill give it a shot? How should the gauge react when ive found the correct connection with the car running? As it is now when I start the car, cold or even heated up it goes to one red bar lean and two amber. At idle its at the same spot but one bar(green) on the rich end flashes until i accelerate. It doesnt sweep or anything. Ive never seen one of these in a na car only turbo and his is rich at start up.

 

you're on the wrong wire. if you're not able to identify the wire in the passenger cabin, then just hook it up directly to your front O2 sensor if it's OBD II, or the only O2 sensor if it's OBD I. should be on the signal wire... the signal wire on the O2 sensor itself should be gray. 4 wire heated O2 sensors have 1 grey for signal, 1 black for ground, and 2 white for the heating element.

 

to answer your second question...
the air/fuel gauge should show the fluctuation from lean to rich while running, the reading will bounce back and forth...
with itr's the fluctuation seems to be slower and more smooth opposed to a single cam where the reading bounces back and forth very rapidly...
when started up it should stay more towards rich while your car heats up, it will slowly start to fluctuate as it heats up to operating temp.
-Bryan-

 

also at WOT it should go into the rich zone.

 

thanks peeps my friend must be hooked up wrong then he told me if it went back and forth it was connected wrong. And thats what it did when I had it on the o2 signal wire. Anyway ill put it back and test drive it. thanks!