Installing wideband questions
 

I have a 99 and am using a brain built ms2. I have it all wired up but as i got an aem wideband i'm not positive how to wire it up. Should i use the stock o2 4 wire o2 and just cut and splice to replace it with the wbo2? I tried searching with not much luck.. Wiring isn't my best suit.. Thank you!

Removed o2 sensor from car, install wideband sensor. Run sensor wires to wideband controller, connect wideband signal wire from controller inside to the o2 input wire. Probably best to put a splice into the stock o2 wire coming into the harness with and easy to remove connector. That way if you want to go back to the stock sensor you can just disconnect the wideband signal wire.

I connected it to where the stock o2 sensor was and splicedit in and it was getting power but wasn't giving me a reading. I wrote it the the megasquirt but the gauge went crazy..

FUCKING ADS

Pictures of what you did?

Pictures of how i have it wired up.

Off topic: Wiring the gm iat sensor, Do i just cut off the stock air temp sensor and use those two wires and then mount it in the same place? If so can i remove the maf at the same time?

or you could just pull the stock iat sensor out and use it.

What in the world is going on there. Move your AEM wideband Gauge into the car. From the Gauge the 6 wires go to the wideband sensor though the firewall, There is a rubber grommet that can be dripped into and you can run the wires though it to the sensor from the gauge. The last 4 wires are power, ground, o2 output, serial output.

I don't know what you have going to the stock o2 sensor but you need to remove it and don't hook up anything to the stock connector, just leave it alone. Oh I see, yeah remove that, put the gauge inside and tap a 12v switched source for the power ( not the radio ) and just run the ground to the chassis, and do what I said before and splice into the stock o2 wire in the harness.

Just unplug the MAF and follow the instructions for wiring the GM IAT sensor that are on DIY's Web site.

Now that you said that it makes perfect sense.... Going right now to do that!

Hand holding is fine but don't ask anyone here to hold onto your penis.

haha ill remember that. Anyways got everything wired up and started the car. Wideband works, used stock iat sensor, and everything seems to be working. Car was pretty rough upon startup. First time with tuning so it definitely is a learning experience.

make sure you check that timing is correct with whats in the megasquirt and whats on the crank pulley

I'm not trying to be a dick, but seriously, that wiring job looks ghetto as hell. I hope that was a test fit and not how you actually wire things up. If you honestly don't see what's wrong with your pics, we can talk over how you can learn and do better, I'm just saying something because I want to help and not to come off as harsh.

Another question.. My car is running at %100 fuel load constantly. I know i probably have something set wrong.. Any insights?

If you are running speed density (MAP sensor) fuel load is basically manifold pressure. You don't have a hose hooked up to your map sensor if it's reading 100%

Ah right you are Danish. Still pretty new at this so thanks!

Alright i'm back with another question. I had my car running the other night and was tuning but this morning i powered it on and my wideband settings were set back to narrowband and my gauge was blank. I wrote it to the controller again but after turning off the car it doesn't seem to save it. It is a aem wideband..

You need to hook up with a local so they can save you from yourself.

Usually this means the controller reset...but I doubt that happened. Are you closing DLL or whatever configures the LC-1 prior to powering the controller down?

I'm using tunerstudio if that is what you were asking and Sometimes i close it before and sometimes after. I didn't think that was an issue as long as i burned all my changes and already wrote the type of wideband to the ecu.

Logworks, sorry. That program is seriously buggy. Make your changes, burn, close, unplug, and then you can say the WB is configured.

Even right after i write it, it is not saving it. It was working normally a couple nights ago so i can't imagine it being a wiring problem. Guessing i should have went lc-1...

no the AEM works fine, I run one.

Make sure when you burn the table the car isn't running, just with the key at on position. Turn off the key off, and back to on and check that the wideband output lines up with TS or close to it 14.8 wideband mirros TS 14.8 or close to the number.
If it doesn't let me know what the wideband says when you turn the car on. It maybe in the wrong mode.
Also does the AEM say P0?

Burned the table while at the on position. Wideband powers up correctly, 111,222, etc. then P00 and then 14.8 and after that it goes blank with three red lines ---. Right when i start it up it seems like it wants to work right and gives me a couple numbers before it shoots up and goes blank again.

did you buy this AEM new or used?
you can test to see if the sensor is bad.

Brand new in the box. And i can't see your picture... Btw thanks for taking the time to try and help

do you have a datalog on startup from tunerstudio?
Also updated video

A datalog can help tell if the motor is running lean enough in that area to cause it to be over 18 afr, which is possible and I've seen it happen. Its Also possible that its so rich that it can read it and shows up as Lean which I've seen as well. Knowing where your PW is at idle can be a tell tale of whats going on.

Heres the datalog. And if i cant get it to work ill definitely test the sensor

tune as well please

do you have a log of it running for a while longer, when the engine warms up? so all the corrections come off and don't alter fueling.

Oh ok. Give me a couple minutes.

Here

yeah PW is high, to much fuel, in your idle area take out fuel.
Your wideband is working, your way rich.
25 to 35 KPA 900 to 1101 rpm put it around 35 and see what happens

Sometimes when its overly rich that wideband will read lean just air. One way to tell is look at PW, another way is check for a bunch of black soot\smoke out the tail or smell of gas.

And this would be on the ve table right? :noob:

yes I will give you a table to try
https://www.miataturbo.net/attachmen...ine=1325124211

Uploaded with ImageShack.us

Throw those numbers in red in low rpm\low kpa the ve table and datalog, report back, just want to know if AFR changes while idling to being less rich.

Afr looks to still be reading full lean

still too much fuel at it, put 30 where 35 is and lower the surrounding ones by 3.

Notice you aren't even out of warmup enrichement yet, so extra fuel is being thrown in as well from that.

Just to let you know you alter the VE table while the engine is on and watch live real time changes happen.
I would select the 4 the dot is idling in and use up and down arrows to change fuel ammount and watch PW and AFR

Oh my bad ill let it warm up a bit more before logging and changing my ve

Did you make sure spark timing is correct?
Also what size fuel injectors?
under startup and idle there is warmup enrichments at the bottom, you can see there the graph and how much it adds

I did not check the spark table. Stock injectors. And i see about the warmup. It stops at 180 and then i logged.

When you installed the megasquirt, you need to verify that the timing the megasquirt is showing is the same as whats on the crank pulley. If you have not done this, do it before you do anything more. If you do not have a timing gun, rent one from a parts store or buy one.

anytime you make a change please include the tune file with the datalog.

I can see GVE is at 37 most of the time at 700 rpm, map is around 40-44 which is off, should be around low 30s so timing could be causing this and PW is still out around 2.8 while its in this area. still gair is effecting it and gbaro which causes Gammae to be at 104.

Oh ok sorry. Heres the tune with that last one. And ill check the timing tomorrow.

yeah check timing and wideband sensor like in that video.
If the sensor checks out ok, with those pw and if my guess of it being to rich is correct when you finally bring fueling down enough it will go from --- to 10s

Where is the wideband location before or after any cats?
Is there a narrowband o2 sensor still in the exhaust somewhere?

Car was a cali version with two cats. i cut both of the o2 sensors off when i put on a new header and mounted the wideband sensor in front of the cat. I spliced into the first o2sensor input wire. The other o2 sensor wires are cut and just sitting there. Could that be the issue?

any updates?

Sorry ended up having to work among other things yesterday. Going to check timing after breakfast

Checked the timing and it was very close. Also sensor checked out and works.. Not sure where else to go at this point

from your last log I still say its rich because the pw is around 2.8 at idle area which is a bit much.
mine is around 1.7pw and 1.5duty cycle.

I would take fuel out around your whole idle area, bring all cells in 500-1500 20-45kpa down to 30 and see what happens.

also just because you bring down to 30 doesn't mean its running with VE at 30, there is still enrichments and whats not that will effect final ve output.

You may also want to disable MAT table correction by inputing the correct numbers to zero that out for time being. Will have to find them.


Forgot to mention, test this out for me.
With your timing light attach it to all the spark plug wires and make sure they are getting spark to all cylinders. I had once a old ms1 that wouldn't fire one coil pack and I was able to idle the car at 3.5ms pw at lambda 1 on two cylinder alone, still you smell the excess gas that wasn't burn, since the o2 sensor can't read this non burnt gas it wouldn't show up on wideband gauge.

Ok I checked and all the cylinders are getting spark. Changed the values and it started to run really rough. Timing is perfect and the spark advance table is the one from diypnp's website.
Edit: Not sure where or how to disable the mat corrections..

Ok there maybe something else like different injectors

in your 500-1500 by 20 - 45 kpa area add fuel, increase it to 50 and see what happens, increase it to 60 and see what happens.

At work right now so ill try it and see when I get off

Really wish my wideband would read... If i lower the ve table to say 30 would changing the timing maybe even it out? I cant tell how rich im running without the afr and as you said my pw is still high as apposed to similar cars..

when its at 60 its really making the wideband change, move it up to 70 and see what happens, seems odd though. but we are trying to figure out

Possibility two injectors aren't firing and its causing this issue.
Obviously as we add fuel it seems to richen up as we can see at 60 gve.

What engine related mods\parts have been added\changed\updated?

Raceland header a cat back exhaust. That's pretty much it. And ill test that now

Well your right about something. The wideband came down after i gave it a whole lot of fuel. Not that that makes sense to me..

99 use returnless fuel system? do you know what fuel injectors are in it and what pressure is base set to?

Yes i believe it is returnless. It has stock 260cc and i believe it has a constant of 60psi

260cc at 60psi?
looks like stock 99-00 injectors are 256cc at 3 bar

I would try 9.8 req fuel and see what happens to your fueling.
9.8 is from 1800cc motor
4 cylinder
303cc injectors

used a calculator to see how much the injectors may change size by from 3 bar(43.5psi) to 4.14(60psi)bar~

Hardly would run.. Im going to try and upload the latest firmware and see if all my setting for sequential is right. It seems like i have a miss.