Knock sensor problem??
Knock sensor problem??
06-07-2017, 11:07 AM
Bandit Yeh was bugging me mate, does sound like a reasonable reason for the knock sensor coming up as a fault,
If the fuelling wasn't being adjusted properly by the ECU it would probably make it knock due to it running lean/rich??
So will rewire it tomorrow and see how it goes? :thumbup1:
Makes sense to me mate
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Sparkystav
06-07-2017, 11:07 AM #31Bandit Yeh was bugging me mate, does sound like a reasonable reason for the knock sensor coming up as a fault,
If the fuelling wasn't being adjusted properly by the ECU it would probably make it knock due to it running lean/rich??
So will rewire it tomorrow and see how it goes? :thumbup1:
Makes sense to me mate
Read my thread here: The Evolution of my Turbo Lexus from NA-Supercharged-Twin Turbo-Massive Single
Please leave your comments.
OutlawJapClub Admin Team
06-07-2017, 11:09 AM
I wouldn't have expected a dodgy O2 sensor / wiring to have raised a knock fault BEFORE raising an O2 sensor fault. Also the lambda output from the O2 sensor feeds back to the ECU for it to control AFR, which has little effect on knock.
I still reckon it was fuel related :lol:
I wouldn't have expected a dodgy O2 sensor / wiring to have raised a knock fault BEFORE raising an O2 sensor fault. Also the lambda output from the O2 sensor feeds back to the ECU for it to control AFR, which has little effect on knock.
06-07-2017, 01:22 PM
toxo I still reckon it was fuel related :lol:
I wouldn't have expected a dodgy O2 sensor / wiring to have raised a knock fault BEFORE raising an O2 sensor fault. Also the lambda output from the O2 sensor feeds back to the ECU for it to control AFR, which has little effect on knock.
In agreement with Toxo here.
it appears the Knock sensor fault has been rectified and this is another fault code that has been generated by a severed o2 wire
1990 Eunos Roadster in Mariner DU blue
Cobalt cat back, Decat pipe, 15in Red Rota GT3 alloys, Toyo tyres, Lowered on Coil overs, Red anti roll bars, 14degree timing mod, white dash kit, illuminated side marker lights,
Halo ring headlights, OEM windblocker, Bluetooth streaming HU, Blue leather handbrake and gear lever gaitor, Centre brake/tail light mod, Blue velour door cards, Polished cam cover, Polished front strut bar, 4xheadrest speakers, JDM floor mats, Suede semi dish steering wheel,
toxo I still reckon it was fuel related :lol:
I wouldn't have expected a dodgy O2 sensor / wiring to have raised a knock fault BEFORE raising an O2 sensor fault. Also the lambda output from the O2 sensor feeds back to the ECU for it to control AFR, which has little effect on knock.
In agreement with Toxo here.
it appears the Knock sensor fault has been rectified and this is another fault code that has been generated by a severed o2 wire
1990 Eunos Roadster in Mariner DU blue
Cobalt cat back, Decat pipe, 15in Red Rota GT3 alloys, Toyo tyres, Lowered on Coil overs, Red anti roll bars, 14degree timing mod, white dash kit, illuminated side marker lights,
Halo ring headlights, OEM windblocker, Bluetooth streaming HU, Blue leather handbrake and gear lever gaitor, Centre brake/tail light mod, Blue velour door cards, Polished cam cover, Polished front strut bar, 4xheadrest speakers, JDM floor mats, Suede semi dish steering wheel,
11-07-2017, 02:14 AM
toxo I still reckon it was fuel related :lol:Would agree higher octane rating = slower fuel burn allowing more ignition advance and/or higher compression. Changing to a lower octane fuel without resetting the ECU will cause "pinking" (knocking) as it is still trying to run the same ignition advance and will take time to re-learn. My Tezza does it if I just switch to normal unleaded.
toxo I wouldn't have expected a dodgy O2 sensor / wiring to have raised a knock fault BEFORE raising an O2 sensor fault. Also the lambda output from the O2 sensor feeds back to the ECU for it to control AFR, which has little effect on knock.Running excessively lean can cause knocking as well but I doubt that the AFR would be that far out because of a faulty O2 sensor, the MAP/MAF should keep the AFR within a reasonable range. The O2 sensor really just "fine tunes" the AFR.
Also agree that the O2 sensor fault would come up before the knock sensor one.
[SIGPIC][/SIGPIC]
toxo I still reckon it was fuel related :lol:Would agree higher octane rating = slower fuel burn allowing more ignition advance and/or higher compression. Changing to a lower octane fuel without resetting the ECU will cause "pinking" (knocking) as it is still trying to run the same ignition advance and will take time to re-learn. My Tezza does it if I just switch to normal unleaded.
toxo I wouldn't have expected a dodgy O2 sensor / wiring to have raised a knock fault BEFORE raising an O2 sensor fault. Also the lambda output from the O2 sensor feeds back to the ECU for it to control AFR, which has little effect on knock.Running excessively lean can cause knocking as well but I doubt that the AFR would be that far out because of a faulty O2 sensor, the MAP/MAF should keep the AFR within a reasonable range. The O2 sensor really just "fine tunes" the AFR.
Also agree that the O2 sensor fault would come up before the knock sensor one.
[SIGPIC][/SIGPIC]
11-07-2017, 03:32 AM
Lexus IS200 Sport Navigator (Now being stripped again) :blink:
Now Don't Forget The REP!!!
Not sure guys to be honest, but been running standard unleaded again since i rewired it and no faults so far,(done just over 750 miles since) so good so far and will be back on the super soon :thumbup1:
Lexus IS200 Sport Navigator (Now being stripped again) :blink:
Now Don't Forget The REP!!!
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