khare
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Posts: 248
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Post by khare on Jan 11, 2018 16:58:13 GMT
Hi guys,
So I installed AEM Wideband sensor and gauge today and I’ve got an issue with it, check video below.
So I noticed it was running lumpy when cold and readings were all over the dial. Once warm the issue became a bit more predictable.
When I give it the beans and there’s lots of throttle movement the gauge reads fine, between 14.7ish and about 12. However if I then go into a cruise and stabilise the revs the reading starts climbing to around 18/19. If I hold the revs steady at that cruise about 10 seconds later there’s a change of note in the exhaust and the car runs smoother and the AFR drops back down to 13/14. Give it the beans again up the rev range and stabilise once more and it’ll do the same, read high and then drop back down with a change of note and smoother.
Video shows it doing the same thing but idleing.
Any ideas?
Red power cable is connected to the yellow and black cable from the interior fuse box that powers the instrument cluster, Black is grounded to a ground I randomly found in the centre dash, and the white wire is wired to the single wire that was providing signal to the old sensor.
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Post by moro on Jan 11, 2018 22:56:22 GMT
The fact that exhaust note changes suggests it's not the gauge playing up but AF mixture ratio is indeed drifting. Do you run standard ECU or not and do you have stock oxygen sensor in place?
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khare
Chats A Bit
Posts: 248
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Post by khare on Jan 11, 2018 23:21:07 GMT
The fact that exhaust note changes suggests it's not the gauge playing up but AF mixture ratio is indeed drifting. Do you run standard ECU or not and do you have stock oxygen sensor in place? No gauge doesn’t play up, I’ve unplugged sensor from ECU harness and now it reads spot on all the time and no jerky running. Standard ECU although waiting in an ME221 to be delivered, no stock o2 sensor, just the Wideband in its place. I have a feeling it may be a ground. The signal wire from ECU harness is a single wire, attached to the +ive from the gauge and sensor, but there’s a negative brown wire for it from the gauge look which at the moment isn’t connected to anything. I’m going to ground it tomorrow and see if that helps the lumpy running.
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Post by schercheeroo on Jan 12, 2018 8:01:57 GMT
Set the rotary position calibration screw to position 4. Details of how to do this are in the AEM instruction manual.
Set it back to position 0 when you install the me221.
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khare
Chats A Bit
Posts: 248
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Post by khare on Jan 12, 2018 9:19:59 GMT
Set the rotary position calibration screw to position 4. Details of how to do this are in the AEM instruction manual. Set it back to position 0 when you install the me221. I had a look at how to do that, as I read it online, but instruction manual doesn’t say anything about rotary position calibration screw...?
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khare
Chats A Bit
Posts: 248
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Post by khare on Jan 12, 2018 10:11:09 GMT
In fact just had a look at back of gauge and there’s no rotary dial. Hence why I didn’t see anything on instruction manual.
I’ve got the AEM x series 30-0300.
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Post by schercheeroo on Jan 12, 2018 12:02:47 GMT
Put the old sensor back in. Your aem system cannot work with the Mazda's ecu
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Post by atlex on Jan 12, 2018 12:42:45 GMT
schercheeroo is correct - because... if your gauge isn't working, you have no choice but to switch to the narrowband sensor. the wideband sensor can't fake a narrowband signal alone. faking a narrowband signal is a feature of the gauges, so if you've got one that isn't working... yarp. clarification: the OEM ECU *only* works with narrowband signal, which is basically a "I am too high OR too low".
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Post by schercheeroo on Jan 12, 2018 14:28:06 GMT
Further to atlex's point, there's no reason to believe the gauge is faulty. You're feeding the ecu a wideband sensor signal when its expecting to receive information from a narrow band sensor. The ecu will not know how to handle the data from the wideband correctly and as a result the fueling will not be correct. This very likely the reason for your odd AFR readings.
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khare
Chats A Bit
Posts: 248
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Post by khare on Jan 12, 2018 19:03:40 GMT
I’ll be going stand-alone with an ME221 in the next few days/week so will just leave unplugged for now. I know the gauge isn’t faulty, I know it’s the wiring, but wasn’t sure whether the brown wire had to be connected up to something or not.
I thought the wideband would be able to act as a narrowband on a stick ecu, but clearly not!
Thanks chaps.
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Post by lowender on Jan 12, 2018 20:22:11 GMT
When you get the ME221, be aware that wideband sensors and gauges are sensitive to where they are wired in (the gauge on the AEM is also the controller that feeds the info from the sensor to the ecu) - a random earth behind the dashboard is not good enough. You need to earth it to wherever the ecu is earthed. Same with the power connection, it's best to take it from wherever the ecu gets it, and both should be as close to the ecu as possible. Best thing is to splice into the loom right next to the ecu plugs. You can test how good your connection sources are by comparing the readings on the gauge to what the tuning software (meite?) is telling you. They should be the same, or very close. I only have experience of the AEM with a Megasquirt, but I can't imagine that using an ME makes any difference to this.
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khare
Chats A Bit
Posts: 248
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Post by khare on Jan 13, 2018 12:51:23 GMT
When you get the ME221, be aware that wideband sensors and gauges are sensitive to where they are wired in (the gauge on the AEM is also the controller that feeds the info from the sensor to the ecu) - a random earth behind the dashboard is not good enough. You need to earth it to wherever the ecu is earthed. Same with the power connection, it's best to take it from wherever the ecu gets it, and both should be as close to the ecu as possible. Best thing is to splice into the loom right next to the ecu plugs. You can test how good your connection sources are by comparing the readings on the gauge to what the tuning software (meite?) is telling you. They should be the same, or very close. I only have experience of the AEM with a Megasquirt, but I can't imagine that using an ME makes any difference to this. I’ve taken the power from the same wire ME themselves show in their guide. They Earth it somewhere differently but I can always change the earth back. Skuzzle will be turning it anyway so he will be able to best point me in the right direction if it’s wrongly wired.
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