Fuel pressure on the rail after engine switch off must remain around 2.5 to 3 Bar for a long time (many 10s of seconds) ................ this is critical too.
Isn't it just. Should it ever be that dirty... even after just a couple of minutes of running ?That O2 sensor is fugly!
Yes it is, and the downstream [Renault] one is reading what it had been when positioned upstream, 1.275vSo is the upstream now reading 0.4 something Volt with ignition on?
Indeed if the mixture is way rich the O2 can look like that ........................... but its totally meaningless as a conclusion/indicator as long as the O2 isn't working - the STFT doesn't have a clue what to do or report if the O2 is screwing the pooch - STFT needs consistency from the O2 to make sense of the mixture - if you know already the O2 is screwed any conversation about STFT or LTFT after that is completely irrelevant............. as is the O2's visual conditionSo I did quite a bit of internet browsing on 'reading O2 sensors' and the black soot is indicative of an over-rich mixture [see link below although I think they mean high 'fuel:air' ratio rather than the other way around. That may also be the reason why the STFT is constantly hunting negative PCTs ?
I don't think you are fully understanding the reason for me on insisting on getting a upstream O2 voltage reading before the engine starts - if you have about 0.4something V reported on the scanner then the heater getting power, and is working and the O2 SHOULD be working normally and you don't need a multimeter to actually measure the voltage.Something to do with the heater functionality of the O2 sensor. I can't remember now whether I previously verified that this was working or not - I'm fairly sure I did. I don't have a multi-meter to go back and do it now... something else to add to the shopping list
Exactly.OK. But is the heater not a separate circuit to the data ? Or is it a case that if the O2 heater is being powered, it registers a potential drop of 0.4v across the data terminals when no exhaust gases are passing over the sensor ?
This will be the crux of the matter ................... is that now better/improved? - I cannot get a feel for it in the logs but it would seem its either gone or way betterThe car accelerates as normal up to about 3,000 rpm and then dies before picking up again. More than just a flat spot, a dead spot.
Yes of course. It does seem to idle slightly better than it did before. I'm quite nervous about hard acceleration until it's been stable for a few days. I'll try it tomorrow morning again [if traffic permits] to see if it's better.This will be the crux of the matter ................... is that now better/improved? - I cannot get a feel for it in the logs but it would seem its either gone or way better
Wow... I never knew the fuel adaptations were reset when the battery was disconnected. Really good to know.Cannot reset fuel adaptations with Torque - switch on headlights, remove battery negative terminal, go have a beer or 2 and reconnect negative terminal, switch off head lights, switch on ignition but don't start, leave for about a minute, ignition off for about 5 minutes. Now start engine without touching throttle and allow to idle for about a minute .................. should now have reset adaptations
So the heater is powered on at all times when the engine is running ? I guess I had it in my mind that the heater would be switched off when the O2 sensor itself reached temperature, or that it would come on/off to keep the O2 sensor at a constant temperature.O2 heater supply is managed by the ECU - ignition on then it will power the heater - ignition off then after a while it will automatically kill the supply