98 fuel gauge after 99+ swap

[picnic_george]

98 trans am, 0411 upgrade. I did the fuel segment swap, but I must have missed somewhere. The gauge is reading empty which I know isn't correct, the scan showed 100% which I don't believe is correct, however it's a lot closer to 100% than it is 0 as the gauge is suggesting. Maybe it's full, it should be close.

Anyway, can someone take a look at my tune and see if I made a mistake along the way with the swap.

[joecar]

It seems to me that you have to reverse the slope on table F0501.

[picnic_george]

It seems to me that you have to reverse the slope on table F0501.I thought it was funny too, but I found a couple people said it needed to be done that way. Even found a thread today with a tune posted that was the same as I have said that's what he did. Oh well guess it says gauge calibration right on it, sorry working a lot of hours. Anything else look funny to you?
Everything else seems to work, so I'm pretty happy about that.

[joecar]

Everything else looks ok.


B3618 PE based on RPM: above 5200 rpm it might be a little lean.

[picnic_george]

Everything else looks ok.


B3618 PE based on RPM: above 5200 rpm it might be a little lean. I'll go through all that and verify it when I tune it. Not sure where I set it, I would assume 1.15.
Just making sure everything in the segment swap looked good. Thanks

[picnic_george]

Do I need to do a full reflash? Did a cal flash from v2 and the gauge still reads empty.

[joecar]

Try doing a full flash.

[picnic_george]

Full reflash didn't do anything, however I changed {F0507} to match what the my compare file was and my log showed 59% and my gas gauge is right at halfway. So even if it's backwards I'll know when I put gas in it. I'll fill it up to confirm that I've got that right.
I still don't know about accuracy of {F0507} as it's the stock setting for a 2002 Fbody which has a different size tank. As long as it shows empty when it's empty and full when it's full I guess I don't care lol

[joecar]

You can "calibrate it" by putting in 4 gallons at a time (4 gal being approx 1/4 tank).

[picnic_george]

I'll see if I can run the tank empty and verify it at some point.

[joecar]

If tank is all the way full, run it for a few gallons, then see how much fuel it takes to fill it back up; then repeat for twice as many (or so) gallons.

[picnic_george]

I had to switch F0501 it back to backwards and it worked. I also changed F0507 to look a little more like the 98 PCM and it seems to be fairly accurate. Log showed 60% fuel, gauge showed almost 3/4, added about 7 gallons of gas and it read full. So I'm confident that the first half of the gauge works. I'll run it empty and verify that everything looks good at some point.

[joecar]

ok, good deal.