I just got done test driving the car after installing the wide band AFR gauge. This thing is sweet!
I had to remove that oil pan bolt in order to fit the sensor. Once in and torqued down, I simply reinstalled the oil pan bolt.
I then ran the wiring up past the rear roll restrictor and then across to the passenger's side wheel well, following the battery relocation wiring.
Rather than drill a hole in the firewall, I came up through one of the floor pan holes by drilling a small hole in the cap.
From there, I ran the wire behind the kick panel in the passenger's foot well, back behind the glove box and then behind the HVAC center holes.
That took care of one set of wires (From the sensor to the gauge). The other set of wires (4 of them, from the gauge to power/ground), where rather simple. I had to find a switched source ... I ended up using this green wire coming from the steering column.
One wire to a switched source, one ground and then two optional wires for data sampling. I'm going to get a serial dongle and hook it up so I can data log it through the XCal2 ... that requires a trip to Radio Shack tomorrow
Here is the finished product
I'll get some video of it working later tonight
After hooking up the gage, I went on a 1 hour test drive. Here are my observations:
I noticed something that I suspect if the cause of my high end stumble.
At light cruise, AFR = 12.5 to 14.5
At light to moderate throttle input (50% at most), AFR = 11 to 12.5
WOT, AFR = 10.0 (it's lowest reading)
After going WOT and it dips to 10:1 (or lower, but I don't know since it will only read 10), if I get off the gas, it will stay at 10:1 for a very long time. The only way to get it to settle into light cruise readings is to lightly open the throttle and then get back off gently.
Could this be attributed to the MAF transfer function or is it pointing to something as simple as a faulty TPS sensor?