All O2 sensors created equal?

**mrmarty51** · 02-20-2013

Originally Posted by EagleMark

It's confusing when they through vacuum into the MAP mix, I don't know why but have seen it before a couple different ways.

Did you get the wire colors for MAT wires for red connector, pins B4 and B9.

OK,I have read this thread all the way through and I am very impressed,but,at the same time,kind of down.I was working with the DIY Autotune bnox on My MG and tried to read about everything on the subject of tables and,well,I`ll say,bnefore I got done it seemed I was more confused than ever.I could not get the MG to run right but did later realize I had a bad injector,at that time I was broke{still am} and could not afford to purchase another injector,so,I took it all apart and put My carbs back on.I`ll work on trying to learn this stuff but,it will be a slow process.
On another note,about vacuum.
I used to have a shallow well cleaning service.At this altitude of about 2500 feet I could pull water,with My diaphram pump,down to about twenty six or eight feet.
Would it be possible that the vacuum could/would be taken into consideration by the ECM and that would equate the MAT,after all,at a certain altitude there will be only XX amount of inches of vacuum,then,throw in the IAT and the ECM doing its magic would adjust the fuel to altitude to temps.well,I guess I do`nt quite know how to word it.thats all.

**JeepsAndGuns** · 02-20-2013

Well B4 is sensor ground (map, etc...) and B9 is the input. So you just splice into one of the other sensor grounds. From what I read it does not matter which wire goes to which. No idea what the factory cpi wire colors are.

**JeepsAndGuns** · 02-24-2013

Did a cold start this morning (well, mid 40's) but the engine was cold. For some reason its holding itself at a higher idle than what I have programmed into the bin. It idled at around 1100rpm for a bit, and slowly started working its way down as the engine warmed up. Once warmed up idle was fine, idled where it was supposed to be. But what could be making it hold a higher than programmed idle when cold? There must be some more stuff I either missed or has not been defined that is effected by enableing the MAT.
I noticed like 250-something undefined differences between a tbi and cpi bin. Sure makes me wonder.

**EagleMark** · 02-24-2013

I've looked into a lot of those undefined and most are error check paremters, EGR, CCP, and mode 4 commands, nothing that would matter.

Idle higher when cold is a good thing?

**JeepsAndGuns** · 02-24-2013

Yea, but this is almost too high. Like said, higher than I have programmed into the bin. 1100 rpm is a little more than I want. I cant really think of a reason for it to have changed, as I dont remember any MAT idle speed parameters.

**EagleMark** · 02-24-2013

See how much timing it's adding at cold start now? Who knows what MAT enabled did? OR what MAT bias did, or does? I'm still trying to figure out why ALtitude Spark Bias is taken out of Main Spark table instead of Altitude Spark Table? AND adds it on Main Spark Table?

**JeepsAndGuns** · 02-25-2013

I thought the same thing this morning. So I hooked up the laptop and watched the cold start. And this morning, for some reason it started completely normally, like it always does. Maybe it was just a fluke? I have no clue. I watched the data and it appears its adding about 4-5 degrees of advance. BUT, once warm, it appears to be adding none. Drove for a good bit and checked the spark advance history table aganst my main table it it pretty much matched within +/- 1 or 2 degrees. It doesnt appear to be adding anything that I can tell. Which is strange, as going by the mat spark table, it should be adding like 6 degrees once warm?

**EagleMark** · 02-25-2013

It should be adding spark at cold start so that's good.

MAT? I worked on one remotely most of the day, built a SYnc bin, ran good at idle for a change, AFR from WB was good, but when accelrating it did the zig zags from 13 to 17 and ran horrible. Well just as bad as the Async bin. You enabled MAT and AFR got a lot better correct? I think there's a lot more to this MPFI conversion then anyone realises, like altitude bias moves to main spark table in the conversion? What else? Mat does what? although some of my issues may be the vehicle, some changes in bin just don't add up when I compare data? The writeup bin is in no way shape or form close to a CPI bin... CPI bin looks to be Sync... so many differences. Like you, it ran good, BLM looked good, but you had a WB AFR gauge and it was not running right. Wonder how many guys don't even realise?

**JeepsAndGuns** · 02-25-2013

Originally Posted by EagleMark

Wonder how many guys don't even realise?

Makes me wonder the same thing.

Originally Posted by EagleMark

You enabled MAT and AFR got a lot better correct?

Yes.
I had a chance to drive it around a lot more today since the swap. The short log above was all I had driven it with the mat last weekend. AFR's are way better than before, and more stable, but Its still wanting to randomly swing around a bit, but nothing like before. It used to swing around constantly, all the time. Now it just randomly does it for short times, and not as far, then back to normal. Strange.

**EagleMark** · 02-25-2013

At steady state drive? It should swing max lean in DFCO. Couild have a little swing on acceleration if AE is off, or little swing in deceleration if Decel is off...

**JeepsAndGuns** · 02-26-2013

Yea steady driving. However I do need to work on AE some. I'm sure you remember with the stock 350 settings it was way too little. So I copied and pasted all the 454 settings and it helped a lot, but it was like it was back with that bin, a little too much. It can drop down to 12 or so if hitting the gas quickly. If I blip the throttle at idle to rev it, it goes 12-12.5 on the wb and takes a second or two to clear back up.
Having never tuned AE, whats the best way to go about doing it in $0D? There are so many AE parameters, I really have no idea where to start. The stock 350 setting were too little, stock 454 settings are too much. So I guess I need to find a happy medium?...lol

**EagleMark** · 02-26-2013

There's about 12 scalers and 8 tables, choose all 5.7 settings. Then work with only 2 tables.
Since you've already found 5.7 not enough and 7.4 to much maybe split the difference to start if all the other adders and multipliers are the same. If not just start all 5.7...

"AE vs. TPS Difference" is a short burst to get AE going.
"AE vs. MAP Difference" lasts a few seconds till the transition is done.

350 to 401 is about 14% difference so add 14% to both those tables and see how it does?

For data with narrow band and closed loop will have to watch INT and BLM during acceleration.