Strange readings from LC1 wideband - has it gone wrong?
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Joined: Jun 2004
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From: Isle of Man
Strange readings from LC1 wideband - has it gone wrong?
Still running the car in after rebuilding the motor, but the other day I logged a run (PFC/datalogit/LC1) and found the AFR was getting as rich as 8.5 under very gentle boost & lowish rpm.
I found that the fuel pressure was way too high after fitting a new fuel pump, so I turned it down to 3bar at idle (no vacuum), and went for a trundle again last night.
The car feels more responsive as would be expected but when I logged it, the AFR output (using FC edit and using the difference across AN1 & AN2 - same as before) was showing as a constant 8.45 ish no matter what driving I was doing, ie at idle, at higher revs (up to about 3k rpm), on deceleration etc - all around roughly 8.5AFR.
I don't for a moment believe this is reflecting the real AFR since I'd guess the car would have run like a crock if this was the case.
It's like the wideband sensor or the controller has got 'stuck' or something, whereas previously I used to get readings from it that were more inline with what you'd expect (around 14.7 at idle then richening with boost but leaning on deceleration etc).
Will it help to do a free air calibration or something, or does it sound like it's perhaps failed?
Appreciate any advice on this
Cheers
Jim
I found that the fuel pressure was way too high after fitting a new fuel pump, so I turned it down to 3bar at idle (no vacuum), and went for a trundle again last night.
The car feels more responsive as would be expected but when I logged it, the AFR output (using FC edit and using the difference across AN1 & AN2 - same as before) was showing as a constant 8.45 ish no matter what driving I was doing, ie at idle, at higher revs (up to about 3k rpm), on deceleration etc - all around roughly 8.5AFR.
I don't for a moment believe this is reflecting the real AFR since I'd guess the car would have run like a crock if this was the case.
It's like the wideband sensor or the controller has got 'stuck' or something, whereas previously I used to get readings from it that were more inline with what you'd expect (around 14.7 at idle then richening with boost but leaning on deceleration etc).
Will it help to do a free air calibration or something, or does it sound like it's perhaps failed?
Appreciate any advice on this
Cheers
Jim
Thread Starter
Scooby Regular
Joined: Jun 2004
Posts: 280
Likes: 0
From: Isle of Man
I've been trying to test the LC1 this morning and I think the actual LC1 itself instead of the sensor may have failed.
The LED does not come on at all for some reason even though it is getting a good power supply just the same as it had while it was working fine.
I've measured the voltage coming out of the analog outputs and it is stuck at the same voltage from both of them no matter what the engine is doing.
Is there anything that could cause this that I can fix? Ie is there some way of resetting the device back to factory or something?
I was able to connect the PC to it and program it no bother, but the LED just does not light up, and the output never changes.
Can someone help? I haven't used this very much since I bought it and I can't really afford to replace it so I need to figure out what's wrong.
Cheers
Jim
The LED does not come on at all for some reason even though it is getting a good power supply just the same as it had while it was working fine.
I've measured the voltage coming out of the analog outputs and it is stuck at the same voltage from both of them no matter what the engine is doing.
Is there anything that could cause this that I can fix? Ie is there some way of resetting the device back to factory or something?
I was able to connect the PC to it and program it no bother, but the LED just does not light up, and the output never changes.
Can someone help? I haven't used this very much since I bought it and I can't really afford to replace it so I need to figure out what's wrong.
Cheers
Jim
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