Fuel status goes to open-cold after pull, lean idle

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Bhillius
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Joined: Sat Mar 03, 2018 3:21 pm

Fuel status goes to open-cold after pull, lean idle

Post by Bhillius »

I'm having issues with idle A/F after a pull it will return to idle and it goes very lean for a second then the A/F goes rich/lean/rich/lean and starts to level out around 14.7, I noticed that the fuel status is going to 1 (open-cold, this is where it goes extremely lean) before it goes to closed loop. Is there anything I can do to make this better?

Calibration and Datalog attached

Thanks
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Spunkster
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Re: Fuel status goes to open-cold after pull, lean idle

Post by Spunkster »

What injectors are you using, and have to entered the correct dead times for them?
Bhillius
Posts: 4
Joined: Sat Mar 03, 2018 3:21 pm

Re: Fuel status goes to open-cold after pull, lean idle

Post by Bhillius »

I am using FIC 1000cc on E85. Dead times have been set to the 43.5psi column however the car is at ~50psi, which I didn't know.

I'm not sure why but the tuner decided to lower the injector cc to 641 instead of using an overall fuel trim for e85 adjustment.
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Spunkster
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Re: Fuel status goes to open-cold after pull, lean idle

Post by Spunkster »

This may need some retuning with the correct settings.
Bhillius
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Joined: Sat Mar 03, 2018 3:21 pm

Re: Fuel status goes to open-cold after pull, lean idle

Post by Bhillius »

I guess I'm confused what is the cause making it go to open-cold fuel status?

It almost seems like the A/F sensor just isn't responding when its in open-cold status , when it goes way lean I see the injectors are still at 2ms. And then later the idle at 14.7af are still ~2ms.
Bhillius
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Joined: Sat Mar 03, 2018 3:21 pm

Re: Fuel status goes to open-cold after pull, lean idle

Post by Bhillius »

Do the dead times need to be set according to actual fuel pressure? Or are they adjusted in the background by the test pressure vs actual pressure?
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Spunkster
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Re: Fuel status goes to open-cold after pull, lean idle

Post by Spunkster »

The dead times should be entered for the pressure you are running, or you should change your pressure to match the injectors.
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