I'm curious. A member was looking over one of my scans and saw that fuel cell 3 never comes up. Even when I go to 99.63% TP even though PE is set to come on at 30% TP.

The PT's log just shows fuel cell 4, but the STFTs and LTFTs lock to zero... Weird. Anyone know why my PCM won't go to fuel cell 3?

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

Is the care going into PE? I have never scanned a N/A car before so I don't know if they are different or not. Can't imagine they would be. Also what fuel cell is it in at WOT?

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)

Posting just for reference because I couldn't remember them all.

0 -- Idle
1 -- Decel
2 -- Light Load / Engine Not Running
3 -- High Load
4 -- Med Load

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)

I get fuel cell 2 and 1 easily enough. 2 comes in with very light throttle (cruising), 1 for decel, and 4 comes in with moderate acceleration (over 5-6% TP) all the way to WOT. Never a cell 3. I do have PE as my LTFTs and STFTs go to 0 right at 30% TP just like the bin file is set.

I searched on the Powrtuner forums and found some posts that at some point it would seem that cell 3 became exclusive to boosted applications. A SS M90 kit member who still has the L36 MAP says he has never seen cell 3 on his car (2002 Imp LS). Nor on any other L36 that he has gotten his hands on.

So, it would seem that it is normal.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

Kind of what I thought but I had never heard of it until now. Does the car seem to run fine otherwise?


BTW any plans to go with some sort of forced induction setup?

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)

Well, I still have a mostly stock tune with transmission modifications. It doesn't have problem running, but it needs some tweaking.


Not for the time being. I decided to shelve the top-swap idea for a while.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas