Afr fluctuations with olsd

[johnj]

Ive done several auto ve's and it still continues to drop afr at idle. It runs and drives great just the idle afr starts around 15 and drops to that 12.8


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[joecar]

VE table, there is a nasty hole right where it idles...



but there is extra fuel coming from somewhere...

[johnj]

Yea thats the only way i can get it to idle that lean is with that deep pocket. I know its not right but thats the only way i have found to make it idle above 12.8 until it warms up.


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[johnj]

Then it just continues to drop after that. Im thinking its got to be in the injector data tables but i dont know where to start. Thats why i paid for a professional tune to try to get a good base that i could just modify the driving areas of my ve table. But that seems to have back fired on me.


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[LastCall]

What injectors do you have?

[johnj]

Siemans deka 80lb


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[LastCall]

I have the data for the Deka 80's, I'll compare to the data in the tune you posted tonight when i get home. One thought, do you have the min pulse IPW cax? The PCM might not be able to command a small enough PW to get to 14.7 at idle.

[johnj]

No i dont have the cax. And thank you for taking the time to look at the injector data


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[LastCall]

No i dont have the cax. And thank you for taking the time to look at the injector data


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No problem. The injector values are different than what I have. I have a few questions; 1) What is your base fuel pressure? 2) Is it manifold referenced? The reason I ask, the values you have look like for a vacuum reference return style fuel system with a base pressure of 43 (3 bar) - flat injector flow.

The forum will not allow the upload of a CAX file so I would either search for it or you can send me a PM with your email address and I'll send it over to you.

[johnj]

Fuel pressure is base for stock truck rails so like 55 psi at idle an i believe it goes up from there


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