Author Topic: stall on throttle closing  (Read 1799 times)

Offline Seight-v8

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stall on throttle closing
« on: October 18, 2019, 01:11:23 am »
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
Engine:Rover V8 4600cc
Vems Firmware:V1.2.38, GPS, SDcard, LCD & Dual lambdas, Wasted spark, 36-1 trigger, Cam Sync & Bluetooth serial.

http://www.vems.hu/wiki/index.php?page=MembersPage%2FScottRichmond

Offline Kamuto

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Re: stall on throttle closing
« Reply #1 on: October 19, 2019, 02:54:55 am »
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
Vems installer in Lithuania
valdas.sunokas@gmail.com

Offline Seight-v8

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Re: stall on throttle closing
« Reply #2 on: October 19, 2019, 06:50:47 pm »
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

Engine:Rover V8 4600cc
Vems Firmware:V1.2.38, GPS, SDcard, LCD & Dual lambdas, Wasted spark, 36-1 trigger, Cam Sync & Bluetooth serial.

http://www.vems.hu/wiki/index.php?page=MembersPage%2FScottRichmond

Offline Kamuto

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Re: stall on throttle closing
« Reply #3 on: October 20, 2019, 02:15:25 am »
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.
Vems installer in Lithuania
valdas.sunokas@gmail.com

Offline alfasud

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Re: stall on throttle closing
« Reply #4 on: October 22, 2019, 11:44:35 am »
May be changing PID settings will help too...

Offline Seight-v8

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Re: stall on throttle closing
« Reply #5 on: October 24, 2019, 12:28:44 am »
many thanks, it gives me a starting point to try a few things.

regards
scott
Engine:Rover V8 4600cc
Vems Firmware:V1.2.38, GPS, SDcard, LCD & Dual lambdas, Wasted spark, 36-1 trigger, Cam Sync & Bluetooth serial.

http://www.vems.hu/wiki/index.php?page=MembersPage%2FScottRichmond