FN-875HN, ITHBMA not functioning

European strategy specific for 2004 ford mustang euro spec but also modified by SVT and used on the 03/04 cobra. Can be used on all 2002-2004 mustang v8 and v6 manual and automatics. Supports automatic 4r70w control. Can be used on 2001-2004 ford F-150 4.6 / 5.4 ecu's if configured correctly as well.
Dave67
Posts: 23
Joined: 2021 Jun 07, 16:17
Location: Texas
Vehicle Information: 2003 Ford Mustang GT, XSH1 Ecu, TVS 1900 supercharger, typical mods.

FN-875HN, ITHBMA not functioning

Unread post by Dave67 »

I've been trying to dial in idle air by watching the datalog payload DESMAF_PID-N. I was off by about -0.35 correction.

Changing ITHBMA doesn't seem to affect anything (which I believe my ITHBMA is the actual problem. my throttle body flows 0.640 lbs/hr with the screw all the way out).

Then, tried changing the values in FN-875HN and FN-875HD across the board, which also resulted in no change.

I was finally able to dial in idle (I was able to bring the logged DESMAF_PID_N to fluctuate around 0.00) by lowering the entire FN-1862N table by quite a bit.

FN-1862N was the only table that I could get to affect idle.

This did fix my hanging idle issue!!! However its not perfect. 725 rpm idle is near perfect correction at 0.00, but if I bump it to say 1500 rpm, I'm off by about -0.11. Obviously, I can't fix this due to FN-875HN not working for me.

Sorry for the long post. Once again, FN-875HN and ITHBMA are not working for me. Could this be a definition problem, or do I have something set wrong here? BIN is attached if needed.
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decipha
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Re: FN-875HN, ITHBMA not functioning

Unread post by decipha »

ithbma is a function in fbgi0, two of them. The scalar is just a blank placeholder.

it should work fine maybe you had an update error on the QH?

why are you not simplifying it?
Dave67
Posts: 23
Joined: 2021 Jun 07, 16:17
Location: Texas
Vehicle Information: 2003 Ford Mustang GT, XSH1 Ecu, TVS 1900 supercharger, typical mods.

Re: FN-875HN, ITHBMA not functioning

Unread post by Dave67 »

Ok. Let me try and find the ithbma functions.

But shouldn’t fn-875hn affect something? I’ve tried multiple values and hit the “commit changes” button several times and never saw an upload error?

I haven’t simplified idle yet just b/c I wanted to try fords way first. Lol!! I’ll do the mechanical idle next
Dave67
Posts: 23
Joined: 2021 Jun 07, 16:17
Location: Texas
Vehicle Information: 2003 Ford Mustang GT, XSH1 Ecu, TVS 1900 supercharger, typical mods.

Re: FN-875HN, ITHBMA not functioning

Unread post by Dave67 »

What are the 2 ITHBMA functions?
decipha
Posts: 2911
Joined: 2021 Feb 15, 12:23
Location: New Orleans, LA
Vehicle Information: 10x Supercoupes
Lincoln LS 5spd
Ls1 t56 ss camaro
Whippled Harley Truck
gmc 2500hd classic
gt40p explorer
Marauder
Chrysler 300 AWD hemi
3.5 Explorer

Re: FN-875HN, ITHBMA not functioning

Unread post by decipha »

hold control and press f for the find box to pop up

type in ithbma and they will pop up
Dave67
Posts: 23
Joined: 2021 Jun 07, 16:17
Location: Texas
Vehicle Information: 2003 Ford Mustang GT, XSH1 Ecu, TVS 1900 supercharger, typical mods.

Re: FN-875HN, ITHBMA not functioning

Unread post by Dave67 »

Thanks Decipha! FN818 did the trick.
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