Electrical Load AFR Issue

[DV8]

Hi Guys,

Hoping someone can help as i'm stumped (again).

Getting quite a large AFR change as i turn on the lights, interior blower, stereo & rear screen demister. As i add load to the system the mixture leans out going from 12:1 right down to 15:1 roughly.

I've added the dead times supplied by grams for the 550cc injectors (see below) which didnt help. Ive also added some more grounds in the engine bay.

I did notice that when the indicators/turn signals are on the walbro fuel pump seems to pulse in tune (also the fuel pressure changes in time).

I've included the map and datalog - recorded on idle starting on nothing turned on and then adding load (starting with rear demister). AFR is also recorded from the AEM UEGO.

Thanks in advance for any thoughts.

[DV8]

I just wanted to add i wired up the Pump direct to the battery - this helped with the indicator ticking but i'm still getting a pretty big AFR drop under load (mainly lights and rear de-mist).

ELD is disabled, should it be enabled or does it sound like another issue?

[Spunkster]

Try adjusting your dead times so until you get no change in fuel when the lights are on.

[DV8]

Thanks Spunkster - I'll try it. :)

Should the ELD be on or off? Which would give the most consistent voltage?

[Spunkster]

ELD should not matter.