Getting the infamous DTC 1-4 HO2S (Heated Oxygen Sensor)(Abnormal HOS2) error
A little history: Recently revamped my VST (new Fuel pump Filter, O-Rings), refurbished Fuel Injectors, new Thermostats, New Low and High pressure Filters, O-rings etc. Current state: engine runs a little rough, if I RPMs from ~1500 quickly down to idle, it might die out. And after engines runs for ~ 5 minutes I'm getting repeatable 1-4 DTC error. Not sure if this is pertinent but, If I increase and decrease the RPMS seems to exacerbate the error.
Oxygen Sensor testing:
Tested on the bench: 12 volts connected to pins 3-4 and digital meter on pins 1-2. Initial Voltage 0 put propane torch on element increased to ~ 1 volts. Removed propane flame voltage drops back down to ~0 volts. Appears to be working on bench test.
Installed back to the Engine, Cleared the error:
H02 sensor, (I think, appears to be working): Voltage fluctuates between 0 and 1 volts.
From the Graph View does the 02 sensor look like its functioning properly?But Error comes back....
Quick Spark Plug Wire test:
As suggested by my Honda Service guy.
As the engine was idling he suggested that I individually removed each spark plug cable wire till it was not connected. In each instance you could hear a slight degradation in operation. I guess the theory is if no degradation the wire must be bad?
Is there a better way to do this verification?
Still to do:
1. Test Fuel Pressure again - Last week it was ~45 PSI, Good, but I was not getting the error (had TStat issues, not running very long), so test again to see if it changed.
2. Do a compression test?
3. Run with Fresh Fuel remote tank.
What else??
A little history: Recently revamped my VST (new Fuel pump Filter, O-Rings), refurbished Fuel Injectors, new Thermostats, New Low and High pressure Filters, O-rings etc. Current state: engine runs a little rough, if I RPMs from ~1500 quickly down to idle, it might die out. And after engines runs for ~ 5 minutes I'm getting repeatable 1-4 DTC error. Not sure if this is pertinent but, If I increase and decrease the RPMS seems to exacerbate the error.
Oxygen Sensor testing:
Tested on the bench: 12 volts connected to pins 3-4 and digital meter on pins 1-2. Initial Voltage 0 put propane torch on element increased to ~ 1 volts. Removed propane flame voltage drops back down to ~0 volts. Appears to be working on bench test.
Installed back to the Engine, Cleared the error:
H02 sensor, (I think, appears to be working): Voltage fluctuates between 0 and 1 volts.
From the Graph View does the 02 sensor look like its functioning properly?But Error comes back....
Quick Spark Plug Wire test:
As suggested by my Honda Service guy.
As the engine was idling he suggested that I individually removed each spark plug cable wire till it was not connected. In each instance you could hear a slight degradation in operation. I guess the theory is if no degradation the wire must be bad?
Is there a better way to do this verification?
Still to do:
1. Test Fuel Pressure again - Last week it was ~45 PSI, Good, but I was not getting the error (had TStat issues, not running very long), so test again to see if it changed.
2. Do a compression test?
3. Run with Fresh Fuel remote tank.
What else??