Dawes AFR strangeness... *confused*
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From: Nottingham
Dawes AFR strangeness... *confused*
ok,
had a Dawes AFR fitted (TSL) and the unit is constantly on BLUE (ie: mega rich) on WOT..
'destructions' quote that : "Blue light stays on all the time: You have the white wire connected to 12v. You may have connected to the 12v line for the oxygen sensor's heater" BUT the technician (bye Ian!) double checked the wiring and its all FINE...
bear in mind my car:
550 injectors,
hybrid turbo
FMIC
LINK ECU
uprated fuelling (components and pressure)
??? SO is it just that the MAP is too rich? Pat mapped it using wideband and got it damn near spot on stoich mostly..
??
knackered lambda perhaps? btw- the AFR is soldered onto the lambda as close to the sensor as possibe..
any ideas guys?
had a Dawes AFR fitted (TSL) and the unit is constantly on BLUE (ie: mega rich) on WOT..
'destructions' quote that : "Blue light stays on all the time: You have the white wire connected to 12v. You may have connected to the 12v line for the oxygen sensor's heater" BUT the technician (bye Ian!) double checked the wiring and its all FINE...
bear in mind my car:
550 injectors,
hybrid turbo
FMIC
LINK ECU
uprated fuelling (components and pressure)
??? SO is it just that the MAP is too rich? Pat mapped it using wideband and got it damn near spot on stoich mostly..
??
knackered lambda perhaps? btw- the AFR is soldered onto the lambda as close to the sensor as possibe..
any ideas guys?
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From: Deepest Darkest Dorset!!
The fact that the blue light is on from what you've said is normal, if the blue light is on when the engines not running but the ignition's on then you have a problem, you should be getting blue on WOT, thats the whole idea!!
The lambda's not knackered, is working fine, if it was knackered the afr would show nothing!
The lambda's not knackered, is working fine, if it was knackered the afr would show nothing!
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From: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
It should flash back and forward at idle / cruise. Blue on WOT.
Anything else, you have a problem.
Trouble is with the dawes, is there's only 4 lights so you cant get an accurate voltage. Having said that, as long as its blue, its fine, and non of them are very accurate. More of a guide.
MB
Anything else, you have a problem.
Trouble is with the dawes, is there's only 4 lights so you cant get an accurate voltage. Having said that, as long as its blue, its fine, and non of them are very accurate. More of a guide.
MB
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From: Nottingham
it IS accurate to 0.05v though according to the technical docs from DawesDevices..
the blue light is on all time at idle/WOT
according to their instructions I *should* be running on the yellow light @ WOT.. (yellow- near as stoich as dammit) when my map was done it was with Wideband and the fuelling was setup only for being overly rich on cold starts..
bit bemused? altho to their credit TSL have offered to check it all again to make sure, and I have emailed JWR to let him know..
*sigh*
feckin cars..
the blue light is on all time at idle/WOT
according to their instructions I *should* be running on the yellow light @ WOT.. (yellow- near as stoich as dammit) when my map was done it was with Wideband and the fuelling was setup only for being overly rich on cold starts..
bit bemused? altho to their credit TSL have offered to check it all again to make sure, and I have emailed JWR to let him know..
*sigh*
feckin cars..
Last edited by chrome; Feb 13, 2004 at 12:36 PM.
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From: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
It may be accurate within itself, but if it doesnt have about 20 lights on it, so how do you know where in the "Blue" light you actually are? It probably has a range of 0.75-1v or something. Even so, its good enough for what we need 
MB
MB
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From: Deepest Darkest Dorset!!
Chrome,
was it on at idle when the engine was cold, or hot, as when cold the engine would be running rich, as if it were on choke, that might go a little way to explaining it!
was it on at idle when the engine was cold, or hot, as when cold the engine would be running rich, as if it were on choke, that might go a little way to explaining it!
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From: Nottingham
on whenever... when it was fitted the car was cold.
I drove it home some way, and drove around a bit more.
got home. turned it off. then went straight back out (hot start)
the blue light was still on, and stayed on
I drove it home some way, and drove around a bit more.
got home. turned it off. then went straight back out (hot start)
the blue light was still on, and stayed on
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From: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
Ah, its on all the time. That means you either have a 12v signal going into the gauge, or the sensor is buggered, and has failed full scale +ve.
You haven't changed the sensor lately have you? If you get the wrong type, this can happen.
Best thing you can do is get a volt meter onto the signal wire, and see what voltage you're getting.
MB
You haven't changed the sensor lately have you? If you get the wrong type, this can happen.
Best thing you can do is get a volt meter onto the signal wire, and see what voltage you're getting.
MB
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From: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
Mark, it does look similar
Stephen, ta (if you meant me
) I know a little to help out here and there.
Chrome, I have just read that BRD sell "cheaper" but good sensors. Well worth getting a new one and see what happens. I would trust TSL's wiring, so supect the sensor. Although a bit odd it was ok when recently mapped, and now its not
They can just die though. Given your mods, its probably a bit hotter than normal 
If the new one doesn't work, at least you have a spare for when it does die! Keep us posted, its good to see these things resolved.
MB
Stephen, ta (if you meant me
) I know a little to help out here and there.Chrome, I have just read that BRD sell "cheaper" but good sensors. Well worth getting a new one and see what happens. I would trust TSL's wiring, so supect the sensor. Although a bit odd it was ok when recently mapped, and now its not
They can just die though. Given your mods, its probably a bit hotter than normal If the new one doesn't work, at least you have a spare for when it does die! Keep us posted, its good to see these things resolved.
MB
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Hi Brad
YHM
It could be one of two problems, the knackered sensor or the fact the feed was taken directly off the sensor and not off the ECU.
As I said in the email though, we have never had a Dawes AFR go wrong so please don't worry about that.
Let me know how it goes.
Jamie
www.dawesdevices.co.uk
www.j-w-racing.co.uk
YHM
It could be one of two problems, the knackered sensor or the fact the feed was taken directly off the sensor and not off the ECU.
As I said in the email though, we have never had a Dawes AFR go wrong so please don't worry about that.
Let me know how it goes.
Jamie
www.dawesdevices.co.uk
www.j-w-racing.co.uk
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Mark- That was my immediate thought.. soldered to the lamdba sensor wire as close as poss for an uninteruppted (sp) signal.. as per the Dawes instructions... but no joy. Blue all the time.. no matter what the scenario.
ign ON- Blue light.
Now waiting to hear from mr dawes himself via Jamie, and TSL only did as instructed via the fitting notes- http://www.dawesdevices.com/wrxmeter.html
I'm not happy particularly as it should have been so straightforward... now I have to take yet more time off and spend more cash to fix it... grrr
hoping this can be sorted swiftly..
ign ON- Blue light.
Now waiting to hear from mr dawes himself via Jamie, and TSL only did as instructed via the fitting notes- http://www.dawesdevices.com/wrxmeter.html
I'm not happy particularly as it should have been so straightforward... now I have to take yet more time off and spend more cash to fix it... grrr
hoping this can be sorted swiftly..
Last edited by chrome; Feb 16, 2004 at 06:49 PM. Reason: typos :(
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From: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
Just out of interest, how did you solder it onto the sensor? The sensor wire is made of a funny material, that would not solder when I tried a while ago. Im sure you have a proper contact, just interested.
Still pretty sure its not the Dawes itself.
You still need to check the voltage at the signal wire, as it may just be stuck at 1v and the sensor has failed rich. Get a test meter on there.
MB
Still pretty sure its not the Dawes itself.
You still need to check the voltage at the signal wire, as it may just be stuck at 1v and the sensor has failed rich. Get a test meter on there.
MB
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From: 15 Credibility Street
Originally Posted by Dark Blue Mark
It may be accurate within itself, but if it doesnt have about 20 lights on it, so how do you know where in the "Blue" light you actually are? It probably has a range of 0.75-1v or something. Even so, its good enough for what we need
MB
MB
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From: Out of darkness cometh light
I have a Dawes AFR, so because it hasn't got about 20 lights on it it's not accurate.
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From: ECU Mapping - www.JollyGreenMonster.co.uk
Chrome,
For reference once the new sensor is in..
At idle it may well be blue etc as with mine you have 550 injectors and a Link and mine wanted rich to idle.. but with ignition on but engine off it should be no lights.
On boost and foot to the floor you should see blue light..
The Link ECU is not using the Lambda, you are just using the dawes as a monitor..
I too have a Dawes AFR etc..
Simon
For reference once the new sensor is in..
At idle it may well be blue etc as with mine you have 550 injectors and a Link and mine wanted rich to idle.. but with ignition on but engine off it should be no lights.
On boost and foot to the floor you should see blue light..
The Link ECU is not using the Lambda, you are just using the dawes as a monitor..
I too have a Dawes AFR etc..
Simon
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From: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
Lueven,
Calm down. None of them are totally accurate, and you dont need them to be. They are only useful as a guide. I just prefer the autometer, as Judge says, it gives you more info. Less lights clearly gives you less info, but depends what youre after.
MB
Calm down. None of them are totally accurate, and you dont need them to be. They are only useful as a guide. I just prefer the autometer, as Judge says, it gives you more info. Less lights clearly gives you less info, but depends what youre after.
MB