Air and Fuel meter

[sergei]

Regardless of the brand, an a/f gauge with a narrowband oxy sensor tell you SFA

Yes! This was my point in the beginning of the thread.

[iOnic]

I have recently changed the 02 sensor on my 20v levin and I have noticed that the air and fuel guage is reading rich all the time...and on top of that when the car is first started it takes about 4-5mins for the guage to start reading and when it does there is no backward and foward movement of the reading on the guage.....it's and Auto Meter guage...

The 4-5 minute thing is normal. Where is the gauge spliced into the O2 wiring? Also what ECU do you have? I noticed you mentioned your mechanic tuning it? What sensor did you use when you replaced it? Also how did the gauge behave with the old sensor and why did you replace the sensor?

Regardless of whether the sensor is a narrowband or wideband - the reading should still change under different conditions Instead of telling the guy to buy other stuff how about maybe trying to help him with his actual problem?

[sergei]

I have recently changed the 02 sensor on my 20v levin and I have noticed that the air and fuel guage is reading rich all the time...and on top of that when the car is first started it takes about 4-5mins for the guage to start reading and when it does there is no backward and foward movement of the reading on the guage.....it's and Auto Meter guage...

The 4-5 minute thing is normal. Where is the gauge spliced into the O2 wiring? Also what ECU do you have? I noticed you mentioned your mechanic tuning it? What sensor did you use when you replaced it? Also how did the gauge behave with the old sensor and why did you replace the sensor?

Regardless of whether the sensor is a narrowband or wideband - the reading should still change under different conditions Instead of telling the guy to buy other stuff how about maybe trying to help him with his actual problem?

Ok, I will attempt to help.

1) is your ecu stock?
2) is the OX sensor in question for stock ecu and is Narrow Band?
3) is it an OEM item?

If the ecu is stock and Oxygen sensor is brand new OEM item, you could ignore the gauge while doing the following:

Warm up the car.
disconnect the gauge.
Take a multimeter and set it to 20V range.
Measure the voltage between pins VF and E1 while holding revs ~2000rpm.
If it reads 2.5V or near (providing the engine is at operation temperature) you are fine.
Check the oxygen sensor reading directly, by setting multimeter at 2V range and measuring voltage between OX1 and E1.
The voltage should fluctuate between ~0V and ~1V 8 times or more in 10 second interval (while revving ~@ 2000rpm).
If there is a weird reading (like constant 1V or 0V) then your OX sensor is stuffed, connected incorrectly (if it is aftermarket) or something else is out of whack.
Normally lack of fluctuations means that ECU is in open loop mode. If oxygen sensor is at fault It means it gave up on trying to correct the mixture according to Ox. sensor.


BTW, if your ECU is stock, and "tuned" by mechanic, apart from setting timing, throttle position sensor, or perhaps fiddling with idle A/F mixture adjustment on AFM (not recommended), or even screwing with spring inside of AFM (if done by cowboys without dyno can lead to bad results), there is nothing to tune.

[FLESHAXXE]

I have the stock ECU......I too thought that the Autometer brand was a very good brand.I will try what you said sergei....

[BZR4AGE]

I have the stock ECU......I too thought that the Autometer brand was a very good brand.I will try what you said sergei....

I think you are missing the point here. REGARDLESS OF BRAND, if you are using a narrow band a/f meter, you will never get accurate and instant enough reading of A/F. You need a Wide Band oxygen sensor.

I have a narrow band A/F gauge too, and it does exactly what you say, and it is normal like that.