As i was looking at something on the FSM for our cars, i noticed something strange. As we all know, our 1.8's have 4 Heated Oxegen Sensor's. 2 of the before and 2 of them after the cat on our stock primary manifold.
Seeing that on the FSM i paid no mind to it but for some reason i decided to look at the CA model. I know the CA model is a bit diffrent but never knew how much. The CA models exhaust manifold differs from the the Federal 1.8's design in more ways than one. One of them being that It has only one sensor on Runners right before the Cat on the primary and one on the bottom after the Cat. Now if that isnt a bit off, take a look at this.
According to the FSM, the top sensor is a "Air Fuel (A/F) Sensor". and the bottom one is a "Heated Oxegen Sensor". The lower sensor on the Manifold is then refered to as the "Heated Oxygen Sensor" , (like what all 4 sensors are labeled for the regular 1.8 setup).
Whe i looked at the exhaust sytem i also noticed that the downpipe on the CA model has a sensor one what apears to be before the Under Floor Cat.
What this all means, i am working on finding out. I have looked over and over but have found no trouble diognostics code for this mysterious A/F sensor. I have spent most of tonight trying to track anything in regards to it or what purpose it may serve. Is it called an A/F sensor for CA Emissions purposes or can it be possibly used as a Wideband O2 sensor for our computers.
By making this thread i hope i make stirke an Idea in the 1.8 owners heads and maybe provide a solution to this for it may benefit us greatly. I'd also like to know what Keith Sipmann has to say since he has been away for a while and I'd also like to see what Andris our other Mod thinks as well.
I believe that the sensor you are refering to is a wide band oxygen sensor. It is much more accurate and expensive than the standard oxygen sensors normally used. I also belive that the CA runs in closed loop all the time.
This is all from memory of other posts I have seen while surfing, I do not have any personal knowledge of this.
I also believe that the CA model has been discontinued. I have only ever seen one on a dealer lot, and did not have a chance to look under the hood. It cost a bit more than the GXE, and had a bit less power.
If this is truly a wideband O2 maybe we can slice 2 plugs into one senor for the O2 reading and maybe play with this wideband a bit. I have 2 extra O2 sensors to play with.
OK so how is our computer reading this and what EXACTLY is it doing with the signal??? Like i said im looking for some form of wiring diagram to help find any clues. Why cant we run this same sensor and let the ECU tune itself with any mods we do? We shall see.
You would need the CA ECU also, as well as the sensors. The CA did not have as much peak power or torque as the standard QG18, it was completely tuned to minimize emissions.
minimize in which way? I mean what does the ECU do with the readings??? If this was a self tuning computer so to speak then we can do some heavy mods and we wont have to worry about the lower HP and TQ numbers from the factory.
Khem
Last edited by khemicol : Jan 6th, 2003 at 12:24 PM.
I see what you mean, since it is already running in closed loop, the ECU should automatically compensate for your mod. It would be great if it would be able to handle boost automatically.
yo Khem, I've been waiting to hear more of your findings. I've been looking through the FSM and see a little of what you mean, but with your mechanical and electrical experience, it means more to you than it does to me.
I for one want to hear it, and the other guys will chime in I'm sure.
The only additional thing I have remembered is that the CA as automatic only. It was also only sold in Kali, and was extremely rare here. I personally never saw a 2000 at a dealer, and only saw one 2001. An ECU from what probably won't be too easy to find.
Finding it wouldnt worry me too much. If you have an Auto it shouldnt be dilema and if you get Boost you wouldnt have to worry about the lower power that the CA ecu makes.
Khem
__________________
"Q: What gear were you in at the moment of the impact?
A: Gucci sweats and Reeboks."
Linear Mode
