AFR gauge and O2 sensors

[latrucker]

I am converting to EFI using a 1990 mustang setup. It uses 2 heated O2 sensors form what I understand (correct me is I'm wrong). I am using an AFR gauge the utilizes a UEGO (universal exh gas O2) sensor. It is a wide band sensor. Can these be tied together to run the efi and use my gauge at the same time? Or do I have to install another O2 bung in my header for the gauge O2 sensor.

 

[WheelHorse]

EECIV uses two pre-cat.

If you can tie in one of them all depends on the manufacturer of the wideband. Some offer a narrow band signal, but you would need to find out via the instruction booklet that came with your particular wideband.

 

[latrucker]

So...if the gauge has the capabilities of reading a narrow band sensor I would just T it in to the existing wires on the factory O2 sensor?

 

[Broncobowsher]

If the gauge is trying to read a narrow band sensor, don't use that gauge. There are plenty of wide band gauges with proper wide band sensors on the market. A narrow band gauge won't read that well, it is either rich or lean or teetering somewhere between. If you are going to the effort of putting an A/F gauge in, do a wide band or don't bother.

Now some of the proper wide band gauges will have a simulated narrow band output that can be used to run the EFI.

Narrow band O2 sensors produce a voltage. If you put too much load on them they will start reading low. Personally I would not be hanging extra loads off the O2 sensor.

 

[latrucker]

If the gauge is trying to read a narrow band sensor, don't use that gauge. There are plenty of wide band gauges with proper wide band sensors on the market. A narrow band gauge won't read that well, it is either rich or lean or teetering somewhere between. If you are going to the effort of putting an A/F gauge in, do a wide band or don't bother.

Now some of the proper wide band gauges will have a simulated narrow band output that can be used to run the EFI.

Narrow band O2 sensors produce a voltage. If you put too much load on them they will start reading low. Personally I would not be hanging extra loads off the O2 sensor.

My gauge is a wide band. AEM UEGO gauge, was asking if there was any way to tie it into the factory O2 sensors for the mustang efi that I am installing. Or...do I have to install a seperate O2 bung for the gauge wide band sensor?

 

[Nellybell]

According to the manual it will not work with the narrow band sensors. You'll need another bung. It should probably be downstream of the narrow band.

UEGO Sensor
The 30-4110 is compatible with Bosch LSU4.9
sensors *only*. This sensor can be
identified by the connector as shown in Figure 7.
Figure 7. Use only Bosch
LSU4.9 Sensors!

Good luck,

Ted

 

[Mountain Ram]

Best not to try to tie them together, you don't want any of the readings to be suspect and you don't want an AFR gauge reading off a narrow band. Stick another pair of O2 bungs in there

 

[latrucker]

Best not to try to tie them together, you don't want any of the readings to be suspect and you don't want an AFR gauge reading off a narrow band. Stick another pair of O2 bungs in there

Yep, better safe than sorry. Gonna put in another bung for the wide band sensor. Just wanted to make sure there wasn't an easier way. Thanks!

 

[Nellybell]

I think there is an easier way. It is called OBD2. Takes a post '96 5.0 to pull it off though as far as I know. (which isn't far at all)

Good luck with yours,

Ted

 

[latrucker]

I think there is an easier way. It is called OBD2. Takes a post '96 5.0 to pull it off though as far as I know. (which isn't far at all)

Good luck with yours,

Ted

Too late to turn back now. Mustang EFI it is. Should have went OBD2 but this mustang stuff fell into my lap along with a cobra intake. Had to run with it, it will be fine. Just have to install another O2 bung.

 

[Nellybell]

Yeah. I run a '93 Mustang setup. I am going to run my o2 sensor voltage to an analog input brick and collect the info with a bluetooth linked laptop. But the data collection with OBD2 and TorquePro on a tablet is very nice and can be done for less than $20. My Mustang stuff runs well though. You'll like it I feel sure.

Best of luck,

Ted

 

[KyleQ]

I take it you are going to read your A/F and "tune" it with an adjustable FPR? I've got 89GT stuff on my 351W with GT40 heads and it runs flawlessly - mass air really is that nice.

 

[latrucker]

I take it you are going to read your A/F and "tune" it with an adjustable FPR? I've got 89GT stuff on my 351W with GT40 heads and it runs flawlessly - mass air really is that nice.

Hoping I don't have to do much tuning once it is running. Really just want the gauge to monitor the AFR. I feel that I can avoid major problems by catching a lean or rich condition early before it becomes a problems. By the way Kyle, it is nice to here all the positive stories about converting to MAF. Makes me feel like i am doing the right thing by converting despite the cost which is a major downer.