Which sensor for Lambda reading in PFC via commander?
#1
Which sensor for Lambda reading in PFC via commander?
I think my Lambda is knackered. Spoke to Andy F and he has said check the sensor reading but I dont know which one it is. There is the top left one in the sensor menu that shows 2.00 (I think its AR) and then (O2) further down that shows 0.00
Any ideas?
Cheers,
Wayne.
Any ideas?
Cheers,
Wayne.
#6
Going to take the IC off tomorrow and have a look to see if the wiring is ok. I can see the plug and it looks to be connected although I can get my hand in to check it.
The last time I had it disconnected was when I fitted the new clutch in October last year. I had the down pipe off and it was laid on the floor. I'm thinking possible damage may have occured.
Ive also been into the Functions part to see if the FB control for O2 is on and it is. Am I right in thinking this switches between open and closed loop, or in ejit speak Lambda or not?
The last time I had it disconnected was when I fitted the new clutch in October last year. I had the down pipe off and it was laid on the floor. I'm thinking possible damage may have occured.
Ive also been into the Functions part to see if the FB control for O2 is on and it is. Am I right in thinking this switches between open and closed loop, or in ejit speak Lambda or not?
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#8
Replaced the Lambda today with a universal 3 wire and it looks to have cured the problem. It idles better and is generally alot smoother.
At idle it reads 0.86-0.88v and cycles from around 0.2-0.6v when criusing.
At WOT its a different story. I only get 0.78v which seems very low to me. I was expecting 0.8 - 0.9v.
Does the PFC read this correctly or do I need a separate guage to monitor things?
Also, whats the cheapest digital AFR meter?
At idle it reads 0.86-0.88v and cycles from around 0.2-0.6v when criusing.
At WOT its a different story. I only get 0.78v which seems very low to me. I was expecting 0.8 - 0.9v.
Does the PFC read this correctly or do I need a separate guage to monitor things?
Also, whats the cheapest digital AFR meter?
#10
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At WOT it will be stable as the ECU is running a stable AFR.
At cruise is will oscillate as the ECU adjusts the fuel to try and achieve stoich (14.7 AFR)
0.82 could be quite lean, what rpm and boost were you pulling ?
But I wouldn't rely on the narrow band output of the Lambda to give you a reliable AFR reading.
At cruise is will oscillate as the ECU adjusts the fuel to try and achieve stoich (14.7 AFR)
0.82 could be quite lean, what rpm and boost were you pulling ?
But I wouldn't rely on the narrow band output of the Lambda to give you a reliable AFR reading.
Last edited by Scott.T; 30 May 2006 at 01:36 PM.
#11
Scott,
I'm not too worried as it was mapped by Andy F to 1.25bar with all the same mods as it has now.
So I'm getting 0.82v at 1.25 in 4th gear at WOT.
Also, after fitting the new lambda sensor there is no knocklink activity again. I was getting the first 2 greens but now nothing.
What I'm worried about is whether or not the sensor is reading right. Am I getting the right AFR but the lambda is reading wrong?
I'm not too worried as it was mapped by Andy F to 1.25bar with all the same mods as it has now.
So I'm getting 0.82v at 1.25 in 4th gear at WOT.
Also, after fitting the new lambda sensor there is no knocklink activity again. I was getting the first 2 greens but now nothing.
What I'm worried about is whether or not the sensor is reading right. Am I getting the right AFR but the lambda is reading wrong?
#14
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im getting 895mv on mine (andrewc monitor) @ wot, which should be 8.9 on the apexi???
but did you know that the sensor heats up over time and starts to read lean IIRC
i think bob rawle told me to cruise for a while at low rpms to bring the temps down, and then go for 1 4th gear run to get a better reading?
but did you know that the sensor heats up over time and starts to read lean IIRC
i think bob rawle told me to cruise for a while at low rpms to bring the temps down, and then go for 1 4th gear run to get a better reading?
#15
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Originally Posted by Welloilbeefhooked
Scott,
I'm not too worried as it was mapped by Andy F to 1.25bar with all the same mods as it has now.
I'm not too worried as it was mapped by Andy F to 1.25bar with all the same mods as it has now.
mine was dropping down over time, and i stuck a sti8 jobbie in from ebay for £20 which sorted it all out
#16
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Originally Posted by StickyMicky
im getting 895mv on mine (andrewc monitor) @ wot, which should be 8.9 on the apexi???
but did you know that the sensor heats up over time and starts to read lean IIRC
i think bob rawle told me to cruise for a while at low rpms to bring the temps down, and then go for 1 4th gear run to get a better reading?
but did you know that the sensor heats up over time and starts to read lean IIRC
i think bob rawle told me to cruise for a while at low rpms to bring the temps down, and then go for 1 4th gear run to get a better reading?
Last edited by Scott.T; 30 May 2006 at 01:43 PM.
#17
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Originally Posted by Scott.T
On the autometer AFR gauge anything above 0.75V is classed as rich. but if you look at a narrow band AFR/Stoich graph the voltages are a bit vague.
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