stall on throttle closing

[Seight-v8]

hello all,

Been driving my 4.6 v8 engine for a few days now finally getting some good data.

A few times though if I am coming to a stop, off throttle, clutch in, and engine stumbles and stalls.....not all the time, sometimes revs drop below 600rpm ish, and then it picks back up.....or a blip on the throttle brings it back, then its fine.

Just not sure which setting controls this area, and as i'm still tweaking the fuel table, but its looking good to about 3.5k rpm area.

Looking at the logs as the throttle shuts, lambda gauge is going lean to 1.83, and revs drop.

any help appreciated.
regards
scott

[Kamuto]

hello all,

Been driving my 4.6 v8 engine for a few days now finally getting some good data.

A few times though if I am coming to a stop, off throttle, clutch in, and engine stumbles and stalls.....not all the time, sometimes revs drop below 600rpm ish, and then it picks back up.....or a blip on the throttle brings it back, then its fine.

Just not sure which setting controls this area, and as i'm still tweaking the fuel table, but its looking good to about 3.5k rpm area.

Looking at the logs as the throttle shuts, lambda gauge is going lean to 1.83, and revs drop.

any help appreciated.
regards
scott

probably overrun fuel cut holds fuel cut too long

[Seight-v8]

Not sure which setting is causing the problem, if you could take a look please.

Adjustable Fuel Cut Settings.
https://i.vgy.me/krX1nl.jpg

Rev-Limit-Overrun-Safety Settings
https://i.vgy.me/iAFNmy.jpg

Did notice the setting in "overrun fuel cut" is 20kpa, and one of my logs showed 12kpa, so maybe I need to change this?

cheers
scott

[Kamuto]

Not sure which setting is causing the problem, if you could take a look please.

Adjustable Fuel Cut Settings.
https://i.vgy.me/krX1nl.jpg

Rev-Limit-Overrun-Safety Settings
https://i.vgy.me/iAFNmy.jpg

Did notice the setting in "overrun fuel cut" is 20kpa, and one of my logs showed 12kpa, so maybe I need to change this?

cheers
scott

fuel resume is too low, make it 1600 or some sort of bigger number, even 2000 are ok.

[alfasud]

May be changing PID settings will help too...

[Seight-v8]

many thanks, it gives me a starting point to try a few things.

regards
scott