How to Microsquirt fuel and spark your LSX swap (sloppy mechanics how to!) 8-10-13
05-29-2015, 02:18 PM
#281
[QUOTE=OldGold;18823263]
First of all, the gauge is correct. So, if your gauge is reading, for example 11.8 AFR and your Micro is reading 10.8, go with the gauge.
What you need to do is tweak the voltage values until the Micro and and gauge read the same. I had to do this with my Wideband Commander. My AEM and my Micro are also different. I have not taken the time to tweak the voltage around.
Mike Thanks Mike
i'll try this weekend to change the value to -1 volt
First of all, the gauge is correct. So, if your gauge is reading, for example 11.8 AFR and your Micro is reading 10.8, go with the gauge.
What you need to do is tweak the voltage values until the Micro and and gauge read the same. I had to do this with my Wideband Commander. My AEM and my Micro are also different. I have not taken the time to tweak the voltage around.
Mike
i'll try this weekend to change the value to -1 volt
06-21-2015, 08:44 PM
#282
I can't connect to my Microsquirt!!!
Not sure of how to start to trouble shoot this. I pulled the plug and ohmed from the plug to the serial pins, so the cable is good. The car starts and runs fine. I have been driving it for close to a year now with no connection issues. Last week I ordered a blue tooth dongle from EFIsource and downloaded shadow dash on my phone so I could data log at the track. Shadow dash worked great last week, but I couldn't get it to connect today. I pulled out the laptop and hooked back up through my serial/usb adapter. Still no connection.
Going to the track again next week for Pinks and would really like to be able to data log.
Any ideas?
Not sure of how to start to trouble shoot this. I pulled the plug and ohmed from the plug to the serial pins, so the cable is good. The car starts and runs fine. I have been driving it for close to a year now with no connection issues. Last week I ordered a blue tooth dongle from EFIsource and downloaded shadow dash on my phone so I could data log at the track. Shadow dash worked great last week, but I couldn't get it to connect today. I pulled out the laptop and hooked back up through my serial/usb adapter. Still no connection.
Going to the track again next week for Pinks and would really like to be able to data log.
Any ideas?
04-17-2016, 05:37 PM
#289
Can't get my micro to read rpm. Aknovaman helped me out with my harness and even ran it on a motor in his garage before shipping it to me . The engine just cranks ( and cranks fast ) and shows no rpm on the dashboard on the laptop . The sensors are grounded to the head , I have a block to chassis ground , and I even swapped out the crank sensor to eliminate that as the issue . I'm not sure what else it could be .anyone else have any advice in what it could be ?
04-18-2016, 01:00 PM
#294
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04-18-2016, 01:12 PM
#295
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If nothing else grounding them elsewhere is just bad practice and can lead to erratic readings.
04-18-2016, 01:26 PM
#296
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Is it still recommended to ground the coils brown wire directly to the head vs. common grounding point on the block?
04-18-2016, 01:29 PM
#297
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it could be...
But also dont confuse sensor grounds, with power grounds for some sensors. Not the same thing.
Depends what the brown wire is. Coils will have a power ground, and the other that some say to ground is the misfire detect wire. Some say to take this to engine/chassis ground, others say ecu sensor ground, so it probably doesnt matter much
But also dont confuse sensor grounds, with power grounds for some sensors. Not the same thing.
Depends what the brown wire is. Coils will have a power ground, and the other that some say to ground is the misfire detect wire. Some say to take this to engine/chassis ground, others say ecu sensor ground, so it probably doesnt matter much
04-18-2016, 02:05 PM
#298
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The only two I can think of that might fall under question of sensor vs. power ground are the Wideband O2 which has both and the crank sensor that get's 12v power, but as I understand it, it gets grounded at the sensor ground.
Correct? Which sensors go to power ground?
04-18-2016, 02:23 PM
#299
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Refer to your ecu manufacturers recommendations !
throttle, MAP, temperature, MAF etc would all have references to signal ground and others like it.
Likes of the MAF would also require a power ground though for the heater aspect of the hotwire element.
Hall sensors, generally they arent fussy at all....ie 3 wire crank/cam as their digital off/on signal is pretty robust and not usually affected by interference or other voltage offsets/variations.
Hence most will work with a 5v supply, 8v, or in this case an unregulated 12v supply. Their output will be a 5v off/on regardless.
Basically anything that will carry current will need a power ground. But most sensors as they draw minimal current and need isolated from potential interference, run only the sensor ground from the ecu. This should never be tied to vehicle ground, although of course ultimately after the ecu, yes the ground is all the same.
throttle, MAP, temperature, MAF etc would all have references to signal ground and others like it.
Likes of the MAF would also require a power ground though for the heater aspect of the hotwire element.
Hall sensors, generally they arent fussy at all....ie 3 wire crank/cam as their digital off/on signal is pretty robust and not usually affected by interference or other voltage offsets/variations.
Hence most will work with a 5v supply, 8v, or in this case an unregulated 12v supply. Their output will be a 5v off/on regardless.
Basically anything that will carry current will need a power ground. But most sensors as they draw minimal current and need isolated from potential interference, run only the sensor ground from the ecu. This should never be tied to vehicle ground, although of course ultimately after the ecu, yes the ground is all the same.
04-18-2016, 02:49 PM
#300
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Refer to your ecu manufacturers recommendations !
throttle, MAP, temperature, MAF etc would all have references to signal ground and others like it.
Likes of the MAF would also require a power ground though for the heater aspect of the hotwire element.
Hall sensors, generally they arent fussy at all....ie 3 wire crank/cam as their digital off/on signal is pretty robust and not usually affected by interference or other voltage offsets/variations.
Hence most will work with a 5v supply, 8v, or in this case an unregulated 12v supply. Their output will be a 5v off/on regardless.
Basically anything that will carry current will need a power ground. But most sensors as they draw minimal current and need isolated from potential interference, run only the sensor ground from the ecu. This should never be tied to vehicle ground, although of course ultimately after the ecu, yes the ground is all the same.
throttle, MAP, temperature, MAF etc would all have references to signal ground and others like it.
Likes of the MAF would also require a power ground though for the heater aspect of the hotwire element.
Hall sensors, generally they arent fussy at all....ie 3 wire crank/cam as their digital off/on signal is pretty robust and not usually affected by interference or other voltage offsets/variations.
Hence most will work with a 5v supply, 8v, or in this case an unregulated 12v supply. Their output will be a 5v off/on regardless.
Basically anything that will carry current will need a power ground. But most sensors as they draw minimal current and need isolated from potential interference, run only the sensor ground from the ecu. This should never be tied to vehicle ground, although of course ultimately after the ecu, yes the ground is all the same.
So, ALL sensors on a Micro LSx go to sensor ground, with the exception of the wideband O2 12v heater element ground.
Thanks for this thread D. So much good info.
Last edited by SethU; 04-18-2016 at 03:01 PM.