Problem adding MAT to $0D TBI 7427, Not pulling timing.

[brian617]

Its fixed! That did it. I am going to have to go back and look at the CTS and MAT blend table.

I think I told you guys wrong here. Because of code 25 being set, the PCM was using -40 C as the intake air temp all the time. So this is the reason I was going extremely rich with anything other than 1 in this table. So 1 gives all control to the ECT and 0 gives all control to MAT. This is why anything lower than 1 in my tune at all was way rich, PCM using -40 C as temp to calculate fuel.

Just looking around and found a thread on Fullsize chevy talking about adding MAT.

http://www.fullsizechevy.com/forum/g...-sensor-7.html

Basically anybody that has added MAT to a TBI bin, and did not fix the code 25 issue, is not getting correct fueling.

That does sound like the problem, now I have to figure out how to add those items to my XDF

[96lt4c4]

That does sound like the problem, now I have to figure out how to add those items to my XDF

I did it for you man! A couple posts up. My .xdf is setup for boost, but you can still use it to change the settings in your .bin file.

[brian617]

Thats cheating lol. I'd like to learn how.

Catch a fish for a man and he can have one meal, teach him how to fish and he wont go hungry?

[brian617]

I'm also using $OE, so locations are different.

[1project2many]

Hmm... I still haven't had time to look at the logs. I'm surprised the ecm was sending actual MAT on the ALDL but using a different value internally. That's not typical behavior.

Catch a fish for a man and he can have one meal, teach him how to fish and he wont go hungry?

Not quite. There's the gear and tackle, the bass boat and trailer, the truck to haul the trailer, electronic gadgets, videos, club memberships and numerous other expenses. But it does generate some good stories!

[96lt4c4]

Hmm... I still haven't had time to look at the logs. I'm surprised the ecm was sending actual MAT on the ALDL but using a different value internally. That's not typical behavior.



Not quite. There's the gear and tackle, the bass boat and trailer, the truck to haul the trailer, electronic gadgets, videos, club memberships and numerous other expenses. But it does generate some good stories!

It is definitely working now, as far as timing goes. I am going to start with the CPI Blend table and see what happens to my AFR. ON the drive in to work this morning I still had it set to all 1's. If it goes back to being way rich then I will know.

I just thought of something, me being the anal guy that I am, checked error 23 and 25 in my bin. I am wondering if you left those off, but still turned on the MAT, if this issue would even come up. A good possibility that most guys just turn on the MAT and do not mess with the error codes?

[brian617]

It is definitely working now, as far as timing goes. I am going to start with the CPI Blend table and see what happens to my AFR. ON the drive in to work this morning I still had it set to all 1's. If it goes back to being way rich then I will know.

I'm curious, if you give MAT full control of fuel, what tables are now responsible for adjusting fuel?