Hello -
I took advantage of the drivetrain-specific skillzz of saturnfans.com to help me install a (narrow-band)
heated oxygen sensor in my exhaust manifold :
Using heated 02 sensor in place of non-heated 02 sensor? - SaturnFans Forums
Here is the unheated sensor behavior at cold start (Universal Bosch 1-wire) :
Here is the heated sensor behavior at cold start (4-wire NTK part no. 29413) :
I compared the before/after YouTubes. The time to enter Closed-Loop operation is almost the same, only a 3 second difference,
. However, the *working* heated oxygen sensor is actually showing normal 14.7 AFR about 24 seconds before the unheated oxygen sensor. This implies to me that the ECU/PCM has a proscribed timer for cold-engine-start to closed-loop operation ... but, if the oxygen sensor is *working*, the ECU/PCM *uses* it during open loop operation (at least that's my hope).
- Time will tell if this helps, but I am already happy because it *works*.
- My hope is that engine-off at red lights and bump starts will have shorter open-loop operation states.
- If it *only* improves my emissions, I will still be happy.
Note: I piggybacked the backup light fuse in the engine bay fuse box. I used this kind of "piggyback" fuse splitter :
The backup light fuse met my requirements of being an "ignition-hot-only" fuse and being "non-critical" to engine operation.
CarloSW2