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Cross Fire Injection. Method of fuel delivery in the L82 motor. The 1984 is the only C4 to use the L82. This is the same engine used in the 1982 C3. ...
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Danspeed1 Back on Tuning, found another issue with o2 sensors
Elite Guru
Mooresville, North Carolina
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Hello everybody!

I haven't posted in a while so Ill give a little background first. Still working on the slowest C4 project ever, but overall things are going very well. Car was put away for winter but I'm getting the itch to get it back out already and keep working on getting it dialed in. This is a 1990 Corvette that was in a fire... wiring harness, engine, just about everything has been replaced. Last year I got it running and somewhat driveable using moats and apu1. I broke out the car a few days ago and started playing with the tuning software again. I noticed some strange issues with the 02 sensors so I decided it might be worth swapping them out for some updated, heated ones. What I found was very interesting:

The drivers side is connected. Its dark in the garage but it looks like a purple wire, original connector still intact. However the passenger side is GONE. No wire, no connector. I started to thumb through the harness, can't find the wire or connector anywhere. Its like it was deleted at some point. Dad states "I didn't touch it." LOL so I can't blame him. Been search Chevythunder for diagrams but to be honest a lot of this has been trial and error if you have been following my posts, the harness never seems to match up to anything on a diagram.

Would anyone be able to tell me what the correct wire color of the passenger side, and drivers side (why not?) oxygen sensors are for a 1990 and possibly a 1991 Corvette? If you have any detailed diagrams, or pinouts please post them as well as I can't seem to match up anything to this car.

As always your help is greatly appreciated. Looking forward to getting back on this project after months of reading!

Dan
Posted on: 2017/1/19 16:39
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bogus Re: Back on Tuning, found another issue with o2 sensors
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This is a strange thing to ask... I assume this is a stock GM harness? For an L98?

Why? Cause they only had ONE O2 sensor...
Posted on: 2017/1/19 20:42
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Danspeed1 Re: Back on Tuning, found another issue with o2 sensors
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LOL! That makes sense. of course the passenger side has a sensor with the wiring hanging, but after googling what you just said, ill remove the sensor and replace it with my wideband.

Dumb question I couldn't find the answer to anywhere. Thanks for clarifying!

DG
Posted on: 2017/1/20 5:23
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Matatk Re: Back on Tuning, found another issue with o2 sensors
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What Andy said...One driver's side single wire sensor.
Posted on: 2017/1/22 23:30
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Danspeed1 Re: Back on Tuning, found another issue with o2 sensors
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Thanks,

I'm going to swap it out for a heated one and give this another shot
Posted on: 2017/1/23 5:35
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Matatk Re: Back on Tuning, found another issue with o2 sensors
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If you have headers a heated O2 is a necessity.
Posted on: 2017/1/23 16:17
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Danspeed1 Re: Back on Tuning, found another issue with o2 sensors
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Quote:

Matatk wrote:
If you have headers a heated O2 is a necessity.


Your not kidding! 100% transformation. BTW this tuning isn't so bad once you have the program setup correctly and the hardware working correctly as well. I got the idle issues situated finally. The headed 02 gave me the ability to properly dial in my BLM's finally!

Dan
Posted on: 2017/2/7 16:12
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1995 Corvette Convertible
1996 Ford Explorer
2009 Cadillac CTS-v
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Matatk Re: Back on Tuning, found another issue with o2 sensors
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Good to hear. It was a huge deal for me going from single wire to heated. With the stock manifolds, the O2 is closer to the heads and heats up...the headers move it towards to collector and it runs "cool" and will even drop into open loop at idle.

I forgot...What tuning setup are you using?
Posted on: 2017/2/8 3:22
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Danspeed1 Re: Back on Tuning, found another issue with o2 sensors
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Moates Autoprom APU1 and Tuner Pro RT

Its tough to get it up and running but once your going its pretty easy to use
Posted on: 2017/2/8 5:18
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Matatk Re: Back on Tuning, found another issue with o2 sensors
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Sounds good. I couldn't remember if you were running one of the new auto-tuners. I still have someone else doing my tuning, it's a bit much for me to take on.
Posted on: 2017/2/9 3:18
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Danspeed1 Re: Back on Tuning, found another issue with o2 sensors
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Nope, but In the future I might look to move towards a stand alone setup like Megasquirt or something comparable so it would be similar to tuning a newer car... much easier.
Posted on: 2017/2/9 6:02
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2009 Cadillac CTS-v
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