A/F guage question
- Thread starter woodyy24
- Start date
Save you money for a real wide band A/F gauge. The ones that use the stock O2 sensors are of little pratical use.
The A/F gauges that use the O2 sensor signal will jump all over the place. The reason is that the O2 sensors "switch" between
.2 volt lean and .6 volt rich with a curve that looks like the drop off a high cliff. The curve is almost straight up and down, so the
voltage shoots from .2 to .6 and back down . again 2 or more times a second at cruse. You won't get much useful information
except when the mixture is extremely lean or extremely rich, there is no middle ground.
Use 43 (Dark Blue/Lt Green wire) or pin 29 (Dark Green/Pink wire ) on the computer. Use Wire tap-ins from Radio shack P/N 64-3052.
The computer is located under the passenger side kick panel. That keeps you from having to crawl under the car and make a weather proof splice in the wiring. You can use either one, or run a SPDT switch and use both. Then you can use the switch to select which side to view.
See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host)
Computer, actuator & sensor wiring
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif
New AutoZone wiring diagrams
http://www.autozone.com/az/cds/en_us/0900823d/80/16/71/3c/0900823d8016713c/repairInfoPages.htm for 79-88 model Mustangs
http://www.autozone.com/az/cds/en_us/0900823d/80/19/59/5a/0900823d8019595a/repairInfoPages.htm for 89-93 model Mustangs
http://www.autozone.com/az/cds/en_us/0900823d/80/1d/db/3c/0900823d801ddb3c/repairInfoPages.htm for 94-98 model Mustangs
The A/F gauges that use the O2 sensor signal will jump all over the place. The reason is that the O2 sensors "switch" between
.2 volt lean and .6 volt rich with a curve that looks like the drop off a high cliff. The curve is almost straight up and down, so the
voltage shoots from .2 to .6 and back down . again 2 or more times a second at cruse. You won't get much useful information
except when the mixture is extremely lean or extremely rich, there is no middle ground.
Use 43 (Dark Blue/Lt Green wire) or pin 29 (Dark Green/Pink wire ) on the computer. Use Wire tap-ins from Radio shack P/N 64-3052.
The computer is located under the passenger side kick panel. That keeps you from having to crawl under the car and make a weather proof splice in the wiring. You can use either one, or run a SPDT switch and use both. Then you can use the switch to select which side to view.
See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host)
Computer, actuator & sensor wiring
http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif
New AutoZone wiring diagrams
http://www.autozone.com/az/cds/en_us/0900823d/80/16/71/3c/0900823d8016713c/repairInfoPages.htm for 79-88 model Mustangs
http://www.autozone.com/az/cds/en_us/0900823d/80/19/59/5a/0900823d8019595a/repairInfoPages.htm for 89-93 model Mustangs
http://www.autozone.com/az/cds/en_us/0900823d/80/1d/db/3c/0900823d801ddb3c/repairInfoPages.htm for 94-98 model Mustangs
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