Misfire Lambda voltage cause or effect?
#1
Misfire Lambda voltage cause or effect?
Been reading other posts and made a few too about this but I have a bit more info.
97 UK turbo 2000 with Apexi ECU.
Im getting an occasional misfire and it seems to happen more after I've put my foot down a little - it doesn't take much though, I have to be really gentle on the throttle.
I've check the plugs, swapped out plug leads and coil albeit for 2nd hand ones. Plugs VERY sooty when I first checked, I know this can be indicative of a misfire but it could also be a symptom of dodgy lambda and ECU making mixture too rich - hence misfire.
Oh - all plugs were same colour so it's not a single plug lead.
I've been looking at the voltage output of lambda on the Apexi controller. Normally it cycles from 0 - 0.76V on cruse and tick over when warm. 0V on over run and a steady 0.88v ish with wide open throttle.
When it starts misfiring the voltage reads a steady 0.88 or 0.9V even when on light throttle. It seems to clear the misfire when the lambda sensor starts to cycle up & down again.
Anyone know if this is indicative of a knackered lambda sensor or is the sensor just reporting on the state of the exhaust while something else is causing the misfire?
This seemed to start a while ago when I changed the plugs and leads. Standard plugs, after market leads (present). I was a doofus as I didn't fit one of the leads properly and it fell off the plug, I so I have a quite a few miles on 3 cylinders, with the fuel obviously washing through the exhaust to the lambda sensor - could this have damaged it?
Thanks in advance
97 UK turbo 2000 with Apexi ECU.
Im getting an occasional misfire and it seems to happen more after I've put my foot down a little - it doesn't take much though, I have to be really gentle on the throttle.
I've check the plugs, swapped out plug leads and coil albeit for 2nd hand ones. Plugs VERY sooty when I first checked, I know this can be indicative of a misfire but it could also be a symptom of dodgy lambda and ECU making mixture too rich - hence misfire.
Oh - all plugs were same colour so it's not a single plug lead.
I've been looking at the voltage output of lambda on the Apexi controller. Normally it cycles from 0 - 0.76V on cruse and tick over when warm. 0V on over run and a steady 0.88v ish with wide open throttle.
When it starts misfiring the voltage reads a steady 0.88 or 0.9V even when on light throttle. It seems to clear the misfire when the lambda sensor starts to cycle up & down again.
Anyone know if this is indicative of a knackered lambda sensor or is the sensor just reporting on the state of the exhaust while something else is causing the misfire?
This seemed to start a while ago when I changed the plugs and leads. Standard plugs, after market leads (present). I was a doofus as I didn't fit one of the leads properly and it fell off the plug, I so I have a quite a few miles on 3 cylinders, with the fuel obviously washing through the exhaust to the lambda sensor - could this have damaged it?
Thanks in advance
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