VE not responding to changes

[Natejk99]

Trying to tune my ve table and it will not respond to any changes I make, its running really rich under part throttle and goes lean immediately after part throttle. I've tried everything I can think of and nothing changes. The truck ran good I changed back to a 1.7 rocker and added a nitrous plate and now I can't get it to do anything I've tried 2 different pcms no changes.
Specs
408ci lq4 13:1 comp
WCCH Stage 3 ls3 heads
Edelbrock Super Victor 4500 flange worked by Fast Forward race engines
T&D shaftmount rockers 1.7
259/279 .652/.632 114+3 nitrous cam HR
Accufab 4500 tb
80lb deutsch werks injectors
Magnafuel 750
Magnafuel regulator

[5FDP]

Tune and log would be helpful.

[Natejk99]

I'll post the tune shortly

[Natejk99]

tune file

[Natejk99]

im using a vacuum ref regulator so fow rate is steady 78lb/hr at 43.5psi set with ref line un hooked

[5FDP]

How are you trying to change the VE?

Are you atleast using a wideband to help make these corrections because that VE table is way messed up.

I assume you are using E85 fuel?

[Natejk99]

How are you trying to change the VE?

Are you atleast using a wideband to help make these corrections because that VE table is way messed up.

I assume you are using E85 fuel?

Yes I am using a wide band set up using lambda error % and I am using e85 it's probably all out of wack all the different changes I've tried to make to it I had idle areas down to 15-20 and it was still idling about .75 to .85 no change what so ever

[Natejk99]

Commanded afr is 9.87 or 1.000 at all times, until in pe and it commands .8 lambda to be safe, is there anything else that controls fueling other than the VE table that I'm missing? I didn't have this issue before. I have pulled the pump and filters both clean. Before I just made the necessary changes err% to the VE table and it was very close 0-4% through out the table.

[Natejk99]

log file

[schpenxel]

Yeah that VE table looks pretty rough.

Does it have the factory O2 sensors still?

[Turbo_Mike]

Yeah that VE table looks pretty rough.

Does it have the factory O2 sensors still?

Even if it did its pretty much gonna be open loop all the time.

If all you did was change your rockers, there should be almost no difference in the tune. Very slight fuel trim. So either you have a bad wideband, or you have something else going on (misfire, valves too right, vacuum leak, bad map sensor) .. It shouldnt be that far off.


EDIT--- I see it, look at IAT in your log. That's your problem. Either fix/hook up the IAT sensor, or rescale the whole range to 70 degrees if you arent gonna run one.

[schpenxel]

EDIT--- I see it, look at IAT in your log. That's your problem. Either fix/hook up the IAT sensor, or rescale the whole range to 70 degrees if you arent gonna run one.

Yup. That is probably it.. can't account for air density changes if there isn't an IAT, and there will def. be air temp changes on a FI setup.

[Natejk99]

That was my assumption that changing rockers I should just have minimal fuel changes I'll try the iat it was like that before though.

[5FDP]

I'm suprised you even got the tune okay before with having no intake temps sensor, that is a must when trying to tune speed density.

[Natejk99]

Idk how I skipped that step I did alot of reading on that subject and found some really good Info I'll try it here shortly and keep you guys posted

[schpenxel]

Things are going to be way off when you first put the sensor back in

[Natejk99]

I tried putting the bias to 2 no change gonna grab a sensor and try that

[Natejk99]

Ok digging this back up having the same issues. I have read flowed injectors, fresh magnafuel 750, and added an iat sensor. I am still unable to make fueling adjustments I've even tried to set the cells at 5 in my Ve table still idles pig rich .750-.8 lambda I'm beginning to wonder if my pcm is bad

[veee8]

Look at your injector pulsewidth in the log, and check out you short pulse adder in the tune. You are in the 5 ms range in the log, I would imagine that needs to be a bit lower. Also if you are going to have your flow rate table for vacuum reference, you need to have the offset table setup that way too.

I can see what you did, you copied the first frame of SPA from Deatschwerks info, which is the limit, not the first cell in the adder table. Fix that, and you should be able to tune away.

[Natejk99]

Thanks for the reply I made the change to the spa what should I do for offset set it to 1?