Stalling out at engagement

Covers all sn94/95 mustang v8 ecu's.
waltnono
Posts: 103
Joined: 2021 Mar 17, 06:44
Location: Lockport, IL
Vehicle Information: 1995 Mustang V8 Swap
WH40
76mm Turbo
4r70W
wbo2-uego

Stalling out at engagement

Unread post by waltnono »

I'm sure that I'm chasing my tail here. The past week my car has been stalling when engaging into gear at warm temp. I found the write-up on the fn371 and leaning out fueling at warm operating temp. I always make sure car is up to at least 170 degrees before rolling out. Problem is that I haven't been able to get IPSIBR within that 0.000 - 0.050 spot. Am I chasing my tail here?
decipha
Posts: 4956
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Stalling out at engagement

Unread post by decipha »

No if its stalling then its probably going lean so you need to enrich it more not lean it out.
waltnono
Posts: 103
Joined: 2021 Mar 17, 06:44
Location: Lockport, IL
Vehicle Information: 1995 Mustang V8 Swap
WH40
76mm Turbo
4r70W
wbo2-uego

Re: Stalling out at engagement

Unread post by waltnono »

The idea is to keep adding fuel until it's happy? Also I did put a looser stall in the trans, would that have any engagement effect?
decipha
Posts: 4956
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Stalling out at engagement

Unread post by decipha »

yeah if it conks out on engagement and your idle isc multiplier in drive is somewhere in the ballpark then the only other variables are spark and fuel. Leaning out on engagement is common and will cause a stall even on newer vehicles. The coyotes for example I add enrichment on engagement to prevent stalling on them in bone stock form.
waltnono
Posts: 103
Joined: 2021 Mar 17, 06:44
Location: Lockport, IL
Vehicle Information: 1995 Mustang V8 Swap
WH40
76mm Turbo
4r70W
wbo2-uego

Re: Stalling out at engagement

Unread post by waltnono »

If it's sparrk, I would make changes in MBT table?
decipha
Posts: 4956
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Stalling out at engagement

Unread post by decipha »

No you would do it with the torque reserve scalar
waltnono
Posts: 103
Joined: 2021 Mar 17, 06:44
Location: Lockport, IL
Vehicle Information: 1995 Mustang V8 Swap
WH40
76mm Turbo
4r70W
wbo2-uego

Re: Stalling out at engagement

Unread post by waltnono »

Think I found the issue. I had to put a stock style fuel regulator on because my adjustable one was too tall to fit box intake. We'll, base fuel pressure jumped to 45psi unplugged and 40psi plugged. Did a quick olmcl and took out 5% and car will engage. Going to multiple slopes by 1.05
waltnono
Posts: 103
Joined: 2021 Mar 17, 06:44
Location: Lockport, IL
Vehicle Information: 1995 Mustang V8 Swap
WH40
76mm Turbo
4r70W
wbo2-uego

Re: Stalling out at engagement

Unread post by waltnono »

Appreciate the help. Car is engaging every time. I multiplied slopes and still had to take out 10% of fn371 just to get it in gear. I'm going to change oil and see how my fueling error is with changes.
decipha
Posts: 4956
Joined: 2021 Feb 15, 12:23
Location: Metairie, LA
Vehicle Information: Work Truck
'19 F-150 3.3L

Re: Stalling out at engagement

Unread post by decipha »

any update?
waltnono
Posts: 103
Joined: 2021 Mar 17, 06:44
Location: Lockport, IL
Vehicle Information: 1995 Mustang V8 Swap
WH40
76mm Turbo
4r70W
wbo2-uego

Re: Stalling out at engagement

Unread post by waltnono »

I just put my old intake and adjustable regulator back in. I had to take 16% fuel out of fn371 with other setup. Got the car to engage good but was dumping way too much fuel under boost. Multiplying slopes helped fuel until boost hit. Once preload hit .750 ish it goes pig rich. I'll punt and kick on this setup and go back with old that worked.
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