Open Loop Lean Condition

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Tmkmatt
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Open Loop Lean Condition

Postby Tmkmatt » Sun Aug 06, 2017 3:21 pm

Wanted to ask a question on a issue I am having
1996 Mustang GT 4.6 N/A with catted x pipe and cat back exhaust.
Just timing adjustments so far. The issue I am having is while looking over the Recon logs from a pass I made this past Friday it appears the car is going lean when it goes into Open Loop.

I am seeing fuel trims drop from low 50's down to low 30's on the short term side. Planning on adding a wideband soon but for now trying to work with what I have. Hoping someone can shed some light on this for me. Thanks in advance, Matt

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Sniper Chris
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Re: Open Loop Lean Condition

Postby Sniper Chris » Mon Aug 07, 2017 10:52 am

Stock MAF on the car?
Stock injectors on the car?
Fuel pressure dropping during a wot run?
Does the Stabilized Open Loop Fuel Table show lean values at the rpm range you're referring to?
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Tmkmatt
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Re: Open Loop Lean Condition

Postby Tmkmatt » Mon Aug 07, 2017 1:34 pm

Chris car still has stock injectors, and mass air. Fuel Pressure I need to check on as I don't have a guage on the car currently.
stabilized open loop fuel table.PNG
stabilized open loop fuel table.PNG (19.59 KiB) Viewed 182 times

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Sniper Chris
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Re: Open Loop Lean Condition

Postby Sniper Chris » Tue Aug 08, 2017 9:48 am

It's pretty rich at top wot and the rest looks good.
When it goes lean does it stay that way or are they just lean spikes every so often?
Fuel pressure would definitely need to be checked.
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Re: Open Loop Lean Condition

Postby Tmkmatt » Tue Aug 08, 2017 3:01 pm

Chris I will be getting in the shop tonight and verifying fuel pressure and working on going over some other details. I have attached a screenshot from the recon data. You will see when it goes into open loop the stft drops and stays that way until deceleration. I am looking to add a good air fuel gauge to help track this a little closer very soon but was hoping to get some issues worked out in the mean time.
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recondata.PNG
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Tmkmatt
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Re: Open Loop Lean Condition

Postby Tmkmatt » Tue Aug 08, 2017 6:24 pm

Chris just finished running fuel pressure test,

30psi @ idle with vacuum
40psi @ idle with no vacuum
40psi @ WOT

Hope this helps

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Sniper Chris
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Re: Open Loop Lean Condition

Postby Sniper Chris » Wed Aug 09, 2017 11:44 am

Ok, those fuel pressure numbers look good.
The '96 is a little goofy with afr. I'd like to hear the afr numbers when you're able to check that. Even though the trims are showing you that, the afr shouldn't be going too lean. You have a stock vehicle (besides x pipe) and even a stock tune should not be going lean.
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Re: Open Loop Lean Condition

Postby Tmkmatt » Wed Aug 09, 2017 1:54 pm

Thanks Chris, Appreciate the input. Hope to add a good afr gauge soon but for now work with what I have. Ill just keep an eye on things and I am going to go over all functions of the O2 sensors and all to ensure its all working properly. Ill keep ya updated with what I find. Thanks


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