When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hello everyone. I've searched high and low for a fix. I recently installed at mspnp pro on my 2002. The full mod list is here https://wheelwell.com/josh-rizzo/nd3/2002-mazda-mx-5-miata
I'll add the data log I took earlier. Basically I'm running 8.4 afr no matter what I do at idle. I'm running the base tune from diy. I've adjusted the required fuel for 350cc injectors. I'm wondering if the 190lph pump is causing the issue. Thank you for any help you can provide. Well I tried to upload the data log but I don't see how. Also should mention all these mods and the wheel well page are the previous owners work. He has a begi reflash on stock ecu so I wanted to go ms
Last edited by mdmiata; 08-30-2017 at 08:35 PM.
Reason: Forgot info
Did you actually try to tune the car? Or did you just change the injector scaling?
I did but it hunts for idle and still runs lean when I adjust ve table. Haven't messed with enrichment settings but I've got the car up to temp and it doesn't change. I changed timing a little at idle with no difference.
For starters, it looks like there is something wrong with your Wideband or its calibration. The AFR in your log is only reading about 4 different values between 10.5 and 7.5. It should be varying much more than that especially when you are changing the throttle setting to keep it running. What wideband are you using and have you selected it under "Tools/Calibrate AFR table"? Does your wideband reading match the AFR shown in TunerStudio?
For starters, it looks like there is something wrong with your Wideband or its calibration. The AFR in your log is only reading about 4 different values between 10.5 and 7.5. It should be varying much more than that especially when you are changing the throttle setting to keep it running. What wideband are you using and have you selected it under "Tools/Calibrate AFR table"? Does your wideband reading match the AFR shown in TunerStudio?
I'm using a lc-1 wb and I replaced the sensor and did a heater and open air calibration with it. Also selected it in Ms. On Ms it seems like the afr gauge is stuck at about 10.4. I have the yellow wire off the lc-1 spliced in the black wire on the front o2 sensor. I believe it's a Bosch 4 wire o2. There's 2 whites 1 gray and 1 black wire on it. The lc-1 is grounded to the block at the throttle body.
For starters, it looks like there is something wrong with your Wideband or its calibration. The AFR in your log is only reading about 4 different values between 10.5 and 7.5. It should be varying much more than that especially when you are changing the throttle setting to keep it running. What wideband are you using and have you selected it under "Tools/Calibrate AFR table"? Does your wideband reading match the AFR shown in TunerStudio?
Originally Posted by tankrust
Does your wideband display reading match the AFR shown in TunerStudio?
Not that I can see. I can barely get the car to run and have the lc-1 warm up to see. It looks like it's stock at 10.4 on Ms. Usually ve analyze live it doesn't say anything about the o2 reading.
Turn off EGO Control and see what happens. Then try to feed the brown wire from lc-1 to ecu, make sure you have lc-1 calibration selected.
I had ego off but I will try the brown wire tomorrow. I'm planning on taking the car to tuner eventually but I wanted it to be idling decently at least. Only probably is the tuner has never worked on ms/Miata before. I'm thinking it shouldn't be too hard for them to figure it out. Thank you for the help and any other advice you're willing to give.
I agree with Akina Downhill and Tankrust on the way to go here. I'll try sharing some step-by-step instructions to make this easier.
I suggest checking your LC1 first to ensure it's working properly. A good way to do that is to see if the AFRs displayed on your gauge are changing, even if they're still reading rich as you're saying. The next step is to click the Tools menu and select Calibrate AFR Table. Select Innovate LC-1 from the dropdown menu. Then you'll want to validate if TunerStudio is seeing the same AFR values as displayed on the Innovate gauge. That'll be displayed on the Air:Fuel Ratio 1 gauge in TunerStudio.
If they're not the same (or pretty close) then you'll want to go back and fix it. If they're the same then you've correctly connected the LC-1 to the Megasquirt and you can adjust your fueling.
To do that, go through the Required Fuel and Injector Dead Time menus to make sure you've properly configured the Megasquirt for your injectors. Next, check your AFR Table 1 to make sure the ratios are what you want and then change the VE table so the cells controlling fuel at idle reflect a reasonable AFR.
Let us know how that goes and we can proceed from there.
I agree with Akina Downhill and Tankrust on the way to go here. I'll try sharing some step-by-step instructions to make this easier.
I suggest checking your LC1 first to ensure it's working properly. A good way to do that is to see if the AFRs displayed on your gauge are changing, even if they're still reading rich as you're saying. The next step is to click the Tools menu and select Calibrate AFR Table. Select Innovate LC-1 from the dropdown menu. Then you'll want to validate if TunerStudio is seeing the same AFR values as displayed on the Innovate gauge. That'll be displayed on the Air:Fuel Ratio 1 gauge in TunerStudio.
If they're not the same (or pretty close) then you'll want to go back and fix it. If they're the same then you've correctly connected the LC-1 to the Megasquirt and you can adjust your fueling.
To do that, go through the Required Fuel and Injector Dead Time menus to make sure you've properly configured the Megasquirt for your injectors. Next, check your AFR Table 1 to make sure the ratios are what you want and then change the VE table so the cells controlling fuel at idle reflect a reasonable AFR.
Let us know how that goes and we can proceed from there.
You're both right. After some more research I should have connected the brown wire to Ms instead of yellow. That will give me the correct range for Ms to see. I don't know if that will fix my rich idle. I'm pretty my dumping raw fuel in the exhaust. I'll swap wires tomorrow and check settings and get back with y'all. Thank you.
But is the car actually that rich, or rather you(and the ecu as well ) are misleaded from false afr readings?
Do you smell gas when it's running?Does it stumble on throttle?
But is the car actually that rich, or rather you(and the ecu as well ) are misleaded from false afr readings?
Do you smell gas when it's running?Does it stumble on throttle?
Well let's put it this way. I found a leak in my exhaust thanks to fuel dripping out lol. Also I burned through an entire tank of 93 within about 2 hours of trying to tune.
Other than checking everything mentioned above, and your tune in general, test your injectors and spark using the test modes.
Make sure all 4 injectors are clicking, if not, you'll know there's some wiring/hardware problem also.
If you have the wideband analog output connected properly and selected in your tune, your AFR in TunerStudio should match your gauge reading even when the car is not started. Turn your key on without starting the car and allow the gauge to complete the HTR cycle, it takes about 30 seconds. If you have not tried to start the car recently, the AFR should go full lean (~22 AFR). Make sure your AFR in TunerStudio matches this. If not, recheck your calibrations and connections. Once you get the TunerStudio AFR reading to reflect what the gauge is saying you need to go in and turn off the MAT corrections or else you will be chasing your tail trying to tune idle. As your car warms up, the correction table is going to start pulling fuel out at too high of a rate if you are on the base map. This will cause you to richen up the mixture in the VE table to the point where your car will not idle when cold. Go to "Basic/Load Settings" and "MAT air density table". It will look like this as a default. For starters you should put all the values in the Corrections column to 100%. After you get the car idling at a good AFR, you can make adjustments to the other temperature ranges as needed. You may also need to adjust the Warm Up Enrichment table, which is under the "Startup/Idle" tab.
If you have the wideband analog output connected properly and selected in your tune, your AFR in TunerStudio should match your gauge reading even when the car is not started. Turn your key on without starting the car and allow the gauge to complete the HTR cycle, it takes about 30 seconds. If you have not tried to start the car recently, the AFR should go full lean (~22 AFR). Make sure your AFR in TunerStudio matches this. If not, recheck your calibrations and connections. Once you get the TunerStudio AFR reading to reflect what the gauge is saying you need to go in and turn off the MAT corrections or else you will be chasing your tail trying to tune idle. As your car warms up, the correction table is going to start pulling fuel out at too high of a rate if you are on the base map. This will cause you to richen up the mixture in the VE table to the point where your car will not idle when cold. Go to "Basic/Load Settings" and "MAT air density table". It will look like this as a default. For starters you should put all the values in the Corrections column to 100%. After you get the car idling at a good AFR, you can make adjustments to the other temperature ranges as needed. You may also need to adjust the Warm Up Enrichment table, which is under the "Startup/Idle" tab.
Ok I got the lc-1 wired up right and the afr is dead on with ts. I changed what you said to change but I'm still running very rich 8.4-8.5
08-30-2017, 08:22 PM
NB2 running rich mspnp pro
0
) are misleaded from false afr readings?
