Heated O2 sensors??
Thread Starter
Instructor
Joined: Jan 2005
Posts: 204
Likes: 0
Heated O2 sensors??
Ok i have been reading a lot of people saying that heated O2 sensors are needed with headers because you they dont get hot enough. I am wondering if this might help my popping at idle. Smells a little rich even after i shut down. Anyone know of anyone who has done this and has been happy with the results and if so is there a procedure somewhere describing this? 
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
I see you have a 87 vette. Try this: Field Service Mode is a mode where you ground terminal A and B of the ALDL when the engine is running. This shows what the O2 sensor is sending the ECM. The Service Engine Soon light will start blinking. For normal operation (usually closed loop) the light will blink once per second. If the O2 sensor is sending a rich condition the light will blink 3 times per sec or stay on more than off. If the O2 sensor is sending a lean condition the light will stay off more than on. My 86 with a nonheated O2 sensor goes into closed loop at about 140*.
Yes, it is very common to have to switch to a heated O2 sensor after installing headers. They don't get as hot as do stock exhaust manifolds. There for the temp at the sensor will be lower and the sensor will tell the ECM to switch back and forth between open loop (usually rich exhaust with various sensor controlling A/F ratio) and closed loop ( O2 sensor controls most of the A/F ratio depending on engine load). The heated O2 sensor uses three wires instead of the stock one ppl wire. The ppl wire does the same and sends the signal to the ECM, one will be a ground wire, and the other will be tied into a power source.
Here are some ideas http://forums.corvetteforum.com/show...ated+o2+sensor
Yes, it is very common to have to switch to a heated O2 sensor after installing headers. They don't get as hot as do stock exhaust manifolds. There for the temp at the sensor will be lower and the sensor will tell the ECM to switch back and forth between open loop (usually rich exhaust with various sensor controlling A/F ratio) and closed loop ( O2 sensor controls most of the A/F ratio depending on engine load). The heated O2 sensor uses three wires instead of the stock one ppl wire. The ppl wire does the same and sends the signal to the ECM, one will be a ground wire, and the other will be tied into a power source.
Here are some ideas http://forums.corvetteforum.com/show...ated+o2+sensor
Thread Starter
Instructor
Joined: Jan 2005
Posts: 204
Likes: 0
The popping sounds to be coming from the exhaust. I have an A/F gauge spliced in to the O2 sensor signal wire and it reads very sparratically even with a brand new sensor. I know i need injectors becuase one is leaking( i believe number 6) I am hoping that maybe it is not getting hot enough and over compensating??
