7.4L- 0411ecm - WAY! TOO RICH AT CRANKING

[joecar]

Yes, very bad to run stoich at any significant load...

[hquick]

B3618 does not have to be EQ 1.00 (same AFR as B3601) for SOL to enable...

SOL enables from the EQ 1.00 cells in B3647 (or in B3605 if B4206 is enabled) if those cells are the richest of the enabled tables at that moment...

B3618 enables when the PE enablers B3608-B3816 are met, but B3618 provides the commanded EQ (or AFR) only if it is the richest of all the enabled tables.

Setting B3618 to EQ 1.00 does not "disable" PE... it merely makes it leaner than the high MAP columns of B3647 or B3605.

Thanks Joe.....that was my understanding of how to enable/setup SOL.

[LS1_Dragster]

Splitting hairs!

So why would you ever enable or set B3618 richer then B3645? I'm trying to figure out any benefit from doing that.

Also, by setting B3618 to stoich, B3601 to stoich and setting any cells you want for cruising or idle in B3647 to stoich and then set high MAP area's to anything other then stoich you effectively force the sole fueling curve to use B3647 correct? If so, then doesn't that in simple terms "disable" PE?

Lee

[joecar]

If you have B3647 then you have these options:
- use B3647 to control EQ based on MAP.
- use B3618 to control EQ based on TP.
- both (the richest cells of all the [enabled] tables wins).

You edit B3616 to enable PE based on TP... for example, you may want some PE to kick in at medium load (MAP will be less than 100kPa) perhaps in a particular rpm range... for example (within this example) this PE may be richer than B3647 at at that MAP and may be leaner than B3647 at 100kPa... [when I said 100kPa I mean BARO]...

i.e. it gives you a way to finely control EQ, if you so wish to do so.


If you have B3605 instead of B3647 then you need B3618.


If the PE enablers are enabled, then PE 1.00 will only have effect if B3647 is leaner than PE... otherwise PE has no effect... (sure, it's "disabled")...

Or you can disable one or more of the PE enablers, so PE will never enable.

[joecar]

i.e. B3618 gives you a "mechanical triggered PE" (via TP), whereas B3647 gives you a "MAP triggered PE" (via high MAP columns).

If you had a Holley 4150 you would choose between mechanical secondary or vaccum secondary, altho this analogy is not technically correct...

(the accelerator pump would be more like PE, whereas the secondary venturi allows added airmass/fuelmass).

[stroker97k1500]

Thanks guys,
I will try to load Lee's tune tomorrow with my parameters, IFR, CYL volume, tire size, rear end ratio, ve table, etc and see what happens..... Thank you for the input... I think I also have a bad fuel pressure regulator and/or injectors bad since the fuel pressure is bleeding off within 2-3 mins after the key is turned off.
I will keep you guys posted
Robby

[LS1_Dragster]

Robby, my fuel pressure also bleeds off in a few minutes, in fact I can watch it!

Joecar - I havent been able to come up with any good reason I would ever use both parameters at the same time! I guess I'm getting too old.....

Lee

[stroker97k1500]

Robby, my fuel pressure also bleeds off in a few minutes, in fact I can watch it!

Joecar - I havent been able to come up with any good reason I would ever use both parameters at the same time! I guess I'm getting too old.....

Lee

I tried your tune with some of my parameters changed(you can see which ones in the history of the attached file if you wish) but it would not idle at all.... I could load my tune in and it idled/ran fine.....
I did an experiment and took the upper intake plenum off, and stuffed blue shop paper towels down each runner and disconnected the FPR vacuum line and put a blue paper towel there and found that #4 injector is leaking a lot with key on prime with the injector harness to the ecm disconnected.
The pictures are at this link below
http://www.pacificp.com/forum/viewto...?p=81278#81278

I am curious to learn more and will keep looking on here for more ideas to see what you guys were saying about the richer than stoich under loads... and will compare my stock van tune to what I currently have now.... maybe this will give me an idea of what you guys mean.
The two tunes attached are what I used the first is Lees tune with my changes per my setup... the last one is the one that the truck is running now

[stroker97k1500]

Does this tune look "safe" with the mixtures like you guys were referring to?

[LS1_Dragster]

One of the issues is your throttle blade is not open enough. I knew you would have to crank on it to work with my tune. If you look at all your air parameters you are adding a ton more air then I am. Plus I like the IAC down in the 30 range. Also, my throttle body is a Holley so you might have to add air to my tune.

Would it idle if you kept your foot on it? Also, is your MAF unplugged?

By the way, the was a semi-open loop tune so LTRIM and closed loop enable should not of been changed.