geogan
Petrolheads
WATCH & LISTEN TO THE PROBLEM HERE: http://youtu.be/yb28Qwk6c98
Diagnosis needed... With car sitting on idle the voltage appears to cycle from about 0.8V down to less than 0.2V every few seconds. Is there something wrong with the O2 sensor here or are those voltages and cycling normal behaviour?
Also when i try idling at around 2000RPM it will NOT stay steady. It appears to misfire (sounds like it in exhaust) and goes up and down like i was moving my foot on accelerator (i'm not, i'm holding accelerator steady as rock). This up/down behaviour appears to be perfectly syncronised with the voltage cycling on O2 sensor.
Last two car tests on this car failed the high idle with these readings:
High Idle: Lambda: 0.96
(2671rpm) CO 1.94 vol% HC 178 ppm
The Lambda reading means its too rich. The CO reading needs to be below 0.20% to pass. Lambda between 0.97 and 1.03 to pass.
The low idle passed with CO 0.04 vol%, HC 39 ppm
Low
High
Car is due to be remapped next week. Just wondering is it a waste of time if there is existing hardware problem...
Diagnosis needed... With car sitting on idle the voltage appears to cycle from about 0.8V down to less than 0.2V every few seconds. Is there something wrong with the O2 sensor here or are those voltages and cycling normal behaviour?
Also when i try idling at around 2000RPM it will NOT stay steady. It appears to misfire (sounds like it in exhaust) and goes up and down like i was moving my foot on accelerator (i'm not, i'm holding accelerator steady as rock). This up/down behaviour appears to be perfectly syncronised with the voltage cycling on O2 sensor.
Last two car tests on this car failed the high idle with these readings:
High Idle: Lambda: 0.96
(2671rpm) CO 1.94 vol% HC 178 ppm
The Lambda reading means its too rich. The CO reading needs to be below 0.20% to pass. Lambda between 0.97 and 1.03 to pass.
The low idle passed with CO 0.04 vol%, HC 39 ppm
Low
High
Car is due to be remapped next week. Just wondering is it a waste of time if there is existing hardware problem...