Normal/Recommended live data specification 1996 2.3

[Edwardh60]

Does anyone have or can point me to what the ranger 2.3, 1996 specifications are? My OBD 2 only gives me the data, not what it should be.
I have searched this forum, cheap chiltons, net, etc., cant find the specifications.

thanks for your help

 

[adsm08]

The Ford PCED will have a reference values chart, but it's hard to say "this should be that" because some of those values can change based on operating conditions, including the weather and/or altitude.

Upstream oxygen sensors should tend to switch between .2 and .8, down streams should be steady around .5 or .6, but can go up and down with throttle as long as the stay mostly a flat line, short term fuel trim should switch around zero, and long term shouldn't ever get above 10%, ideally.

 

[RonD]

Yes, +1 ^^^

2.3l difference from any other engine would just be MAF sensor air flow because it uses 2.3 liters of air, a 4.0l uses 4 liters and a 5.0l uses 5 liters at the same RPM.

Google: understanding OBD II data

Post any specific question here.
And remember trouble codes are not meant to be read literally, if a code mentions a sensor or part, it usually means that sensor or part is WORKING, it detected the problem, so don't 'shoot the messenger'

Some of the OBD II data that is generic
Engine temp(ECT)
Air temp(IAT)
LTFT-long term fuel trim
STFT-short term fuel trim
TPS-throttle position
RPM
Engine load
Spark timing
EGR
O2 sensor voltage
EVAP
Speed

All gasoline engines run on an air/fuel mix of approx. 14.7:1, while a 2.3l uses less fuel, that is because it uses less air.
So fuel trim numbers would be the same on a 2.3l or 5.0l if both were running normally, between -3 and +7
And O2 sensor voltage as well, sweet spot is .45volts, computer adjusts fuel trim to try and maintain that voltage, as said above, .20-.80v is normal switch range when driving, idle should be richer, that is normal.
Engine temp would also be the same regardless of engine size
Air temp, well that is based on outside air temp so............

STFT changes quickly, it is short term fuel trim, so computer is constantly adjusting fuel injectors based on O2 sensor feedback.
LTFT changes but is slow to do so, long term fuel trim is used when engine is cold(no O2 sensor feedback) or when computer thinks there is a problem with fuel system, as an engine gets older fuel pressure can go down, injectors get dirty, ect....
LTFT allows the computer to have a "memory" of fuel mix changes over a long period.


MAF data is the only engine size difference, and generally if you set scanner to read grams per second it will show approx. engine displacement at idle.
So a 4.0l would show 4gr/sec, 2.3l - 2.3gr/sec, if MAF is working correctly, but it is RPM based of course, idle of 600rpm would pull in less air than idle of 750rpm