S130Z Posted July 11, 2008 Share Posted July 11, 2008 so i was driving to columbia, SC from y house 2 hours away last knight and i noticed a blinking light down by my foot. i got out of my car at a weight station and checked it out. it was a green light that blinks constantly 2x a sec. when moving and it stays steady on when at idle. i have my cold start valve unplugged and i dont know if this is causing this light to blink. my car wont run with the cold start plugged in anyways. does anyone know what this light is? Quote Link to comment Share on other sites More sharing options...
mikeatrpi Posted July 11, 2008 Share Posted July 11, 2008 I believe its an indication that oxygen sensor is operating correctly. http://www.zcar.com/forums/read/1/113267/113269 Quote Link to comment Share on other sites More sharing options...
S130Z Posted July 11, 2008 Author Share Posted July 11, 2008 i just replaced my 02 sensor about a week back, so that would explain why i just notcied it. Quote Link to comment Share on other sites More sharing options...
Daeron Posted July 13, 2008 Share Posted July 13, 2008 on my 87 subaru EA82 (1.8OHC, hitachi built EFI) the ECU has a green LED that comes on whenever the O2 sensor reads "rich" and cuts off at stoich or lean. Does the Z have the same thing??? Quote Link to comment Share on other sites More sharing options...
DuoWing Posted July 13, 2008 Share Posted July 13, 2008 Yeah, the ECU's do have this same thing. I forget if it operates as you said, but the procedure for telling if your O2 sensor is good or not is by checking that light. While revving or holding the RPMs up the light is supposed to blink on and off which would indicate an O2 properly cycling back and forth. When I messed up my O2 sensor from it getting banged around in the turbo's downpipe when I removed my manifolds, I checked that light and it was just constantly lit up. The car also ran noticeably more sluggish. Quote Link to comment Share on other sites More sharing options...
S130Z Posted July 13, 2008 Author Share Posted July 13, 2008 i appreciate all the information. i am getting a air/fuel ratio in a couple days to check if i am running rich. i am running 300zx injectors. they are just 20cc larger. Quote Link to comment Share on other sites More sharing options...
Daeron Posted July 14, 2008 Share Posted July 14, 2008 what year car is this? Quote Link to comment Share on other sites More sharing options...
S130Z Posted July 14, 2008 Author Share Posted July 14, 2008 it is an 83 Quote Link to comment Share on other sites More sharing options...
S130Z Posted July 28, 2008 Author Share Posted July 28, 2008 so as i was driving last night i noticed that the blinking light isnt just blinking all the time, my observations concluded that (unlike in the 1st post) at a dead stop the light flickers sporadicly, in neutral when the car is moving the light turns off, in gear at steady rpm and on the throttle the light blinks consistantly, and if i barely have my foot on the gas the light will stay solid. i am still doing reaserch from other sites and i am gonna call the nissan dealership and ask some questions, i lost my owners repair manuel so i cant check and see if the answer is in there. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted July 28, 2008 Share Posted July 28, 2008 I think, not sure, that the light blinks as the O2 sensor reading crosses a voltage threshold. It indicates that the sensor is reading O2 levels in and around the proper range. Again. "I think" Want to check to see if I'm right? http://forums.hybridz.org/showpost.php?p=899299&postcount=32 Quote Link to comment Share on other sites More sharing options...
S130Z Posted July 28, 2008 Author Share Posted July 28, 2008 Thanks alot, im gonna search through that as best as possible. Quote Link to comment Share on other sites More sharing options...
Daeron Posted July 29, 2008 Share Posted July 29, 2008 on my 87 subaru EA82 (1.8OHC, hitachi built EFI) the ECU has a green LED that comes on whenever the O2 sensor reads "rich" and cuts off at stoich or lean. Does the Z have the same thing??? Yeah, the ECU's do have this same thing. I forget if it operates as you said, ..... so as i was driving last night i noticed that the blinking light isnt just blinking all the time, my observations concluded that (unlike in the 1st post) at a dead stop the light flickers sporadicly, in neutral when the car is moving the light turns off, in gear at steady rpm and on the throttle the light blinks consistantly, and if i barely have my foot on the gas the light will stay solid. i am still doing reaserch from other sites and i am gonna call the nissan dealership and ask some questions, i lost my owners repair manuel so i cant check and see if the answer is in there. Yep. I bet it stays on constant anytime you have your foot on the pedal whatsoever.. on passive cruise it would go back and forth across the stoich threshold, and at idle you are doing the same thing, and neutral cruise still spins the clutch a tiny bit so the engine is being imparted a bit of energy from the slowing car, so it would naturally go lean. Remember, this is just a narrowband O2 sensor.. it is slow reaction time (about a second or more) and it is not very good at what it does; it pretty much tells the computer "RICH" or "LEAN" in a simian manner. They fucntion through a range of 1 volt, and ~.5 volts is stoich, lower is rich, higher is lean. It works about as well as your ear, but it outputs a signal that electronic processors can comprehend. Thats cool to know, I wonder if the earlier model ECUs have this. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.