Explain it to me like i'm 5

Mok4200

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Did a short idle/rev data log, and i'm concerned with what i see. Short term showing bank 1 max is 1.19 and bank 2 is max at 1.20, i've been told anything over 5% is bad...so at 20% im down right worried. Am i understanding that correctly? or should i not be worried? Car has dual fuel pumps, wondering if i should rip them out and put a single high flow in...
 

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Mok4200

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Are you just starting a tune or did you want to check something?
I’m concerned with the tune that’s on the car. I bought this car in October of 2018 and have not touched it. Now I’m worried that I shouldn’t be driving it at all
 

01yellercobra

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Well, a new pump won't change your STFT's. That's in the tune itself. Are you getting any codes? If everything is mechanically good then I'd talk to a tuner.

Usually I would say a lean condition is from a vacuum leak. Both sides would be something in the intake. But the car wouldn't run right at that point.
 

Mok4200

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No codes, I’ll likely have it re-tuned, is there any concerns with using American Muscle? They’re considerably cheaper and tune far more cars than any shop in close to
 

DSG2003Mach1

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no to AM. Blown motor is gonna cost ya 10k to rebuild, a few extra bucks for a good tune is worth it.
 

96gt02

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Yeah your running roughly 20% lean too, and even at idle your about 10% still. Rich would at least be safer but still not great, car wont throw a lean code until it hits 25% just FYI
 

Chersch7406

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No codes, I’ll likely have it re-tuned, is there any concerns with using American Muscle? They’re considerably cheaper and tune far more cars than any shop in close to
I see your in Michigan, depending on where your located I would go with Alternative Auto(Lidio) just north of Detroit.
 

decipha

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thats the lambse your looking at its removing 20% fuel.

If your parked/idle/not moving then that number means absolutely nothing on a quick throttle stab
 

decipha

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thats the lambse your looking at its removing 20% fuel.

If your parked/idle/not moving then that number means absolutely nothing on a quick throttle stab
 

Mok4200

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thats the lambse your looking at its removing 20% fuel.

If your parked/idle/not moving then that number means absolutely nothing on a quick throttle stab

I was parked, though these numbers are similar to when the car is cruising.
 

ViperRed91GT

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To add to what’s decipha said, the 5-10% is the max variance you want to see between the two. Those numbers just show what the computer is having to do to get the commanded AFR.
 

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