we can work rich cars backwards 2 ways, diagnosis is not one (method)
1: using 4 gas analyzers you do not have. (we tap the exhaust header adding gas test port) and then work the problem from this Angle.
or.
2: using a scan tool and monitoring the 02 sensor , even plotted, (your tool can not do that only the Tech1 tool , 31 years old today is defective from age and not sold at all.
what we do with a real scan tool is plot the O2 sensor. (as done and seen all all 96' + and newer cars here, or 2007 in your country)
it must swing, the O2 must swing or the ECU is not in Closed loop mode.
if not in closed loop mode that means fueling rates are out of control
The ECU is not in control now. even with 180f coolant at spec and ETC shows same.
this discovery leads us to finding the cause, true cause,'
we even do tricks, like forcing fuel pressure low too low to see of closed loop wakes up. or force too high fuel pressures.
trick #2 is adding illegal air. (air leaks behind the maf are illegal and causes lean out. (illegal means UN METEREd AIR, as in fooling the mAF)
ASE school teaches all that. and more. (we can test every sensor to be sure they work this is but 1.)
see here what you can;t see this is the suzuki OBD1, tables inside the ECU.
https://fixkick.com/ECU/Tech1/full_scan2.html
see parameter 11, (closed loop status) and fuel trim, note that is what you seek. (O2 readings and trim)
p10 can be plotted for O2 actions, sensor 02 swings. .1 to .9v.
here are the hacking tools
https://fixkick.com/hacking/hacked/addre...acked.html
if still available. and by country. talk to them about Australia first. (your ECU has unique ID codes and matters !)
One problem is the ECT is not the same in all countries, and OBD1 scanners may show wrong ECT readings, so we aware of that.... many did. even TECH1.
here is me doing that. o2 sensors do not swing just by themselves, no. this is the ECU hunting (servo tech) to find the perfect Air fuel mixture 14.7:1
The swing is ECU hunting mixture rates, at hot idle and steady cruise, (02 is off line cold or engine accelerating goes rich then "12:1"~~~)
this actions proves closed loop works right. for sure full swings. (no offsets and not stuck.)
uSA 96 sidekick(vitara)G16b. this is the goal when MPG fails. (rich burn stuck) if the O2 stuck a 0volts ECU goes rich, exhaust cracks do 0v. and rich. near.by.
it can swing 6 times a second on fresh O2 sensors. they last 100k miles.par. (this is 02 scan mode just that only) graph mode. a $40 tool. here
![[Image: O2b1s1.jpg]](https://fixkick.com/sensors/O2%20sensor/O2b1s1.jpg)
1: using 4 gas analyzers you do not have. (we tap the exhaust header adding gas test port) and then work the problem from this Angle.
or.
2: using a scan tool and monitoring the 02 sensor , even plotted, (your tool can not do that only the Tech1 tool , 31 years old today is defective from age and not sold at all.
what we do with a real scan tool is plot the O2 sensor. (as done and seen all all 96' + and newer cars here, or 2007 in your country)
it must swing, the O2 must swing or the ECU is not in Closed loop mode.
if not in closed loop mode that means fueling rates are out of control
The ECU is not in control now. even with 180f coolant at spec and ETC shows same.
this discovery leads us to finding the cause, true cause,'
we even do tricks, like forcing fuel pressure low too low to see of closed loop wakes up. or force too high fuel pressures.
trick #2 is adding illegal air. (air leaks behind the maf are illegal and causes lean out. (illegal means UN METEREd AIR, as in fooling the mAF)
ASE school teaches all that. and more. (we can test every sensor to be sure they work this is but 1.)
see here what you can;t see this is the suzuki OBD1, tables inside the ECU.
https://fixkick.com/ECU/Tech1/full_scan2.html
see parameter 11, (closed loop status) and fuel trim, note that is what you seek. (O2 readings and trim)
p10 can be plotted for O2 actions, sensor 02 swings. .1 to .9v.
here are the hacking tools
https://fixkick.com/hacking/hacked/addre...acked.html
if still available. and by country. talk to them about Australia first. (your ECU has unique ID codes and matters !)
One problem is the ECT is not the same in all countries, and OBD1 scanners may show wrong ECT readings, so we aware of that.... many did. even TECH1.
here is me doing that. o2 sensors do not swing just by themselves, no. this is the ECU hunting (servo tech) to find the perfect Air fuel mixture 14.7:1
The swing is ECU hunting mixture rates, at hot idle and steady cruise, (02 is off line cold or engine accelerating goes rich then "12:1"~~~)
this actions proves closed loop works right. for sure full swings. (no offsets and not stuck.)
uSA 96 sidekick(vitara)G16b. this is the goal when MPG fails. (rich burn stuck) if the O2 stuck a 0volts ECU goes rich, exhaust cracks do 0v. and rich. near.by.
it can swing 6 times a second on fresh O2 sensors. they last 100k miles.par. (this is 02 scan mode just that only) graph mode. a $40 tool. here
http://www.fixkick.com