HUGE backfire and stalling on 5.7 charger

[Weston]

I installed the 91 cia tune and raise the redline, and it feels really nice. But when I get to redline it tries to upshift then loses all power, then when you slow down it stalls. I have an auto so it has a big delay on when I decide to shift it too, so I can’t test to see if shifting sooner fixes it. The first time it happened a massive backfire shot and it sounded like a cannon, but it sounded clean. It didn’t sound crispy or crunchy just loud asl bang. I will lower the redline to 6k rather than the 6.4k I raised it to, but I haven’t been able to test if it is still a bomb. That blows though because I have a Holley midram intake so my power band has been raised to end near 6.5 k so I would like to keep it as high as possible if it’s not actively making my engine a 5.7 liter bomb.

When it loses power it seems like an electronic safety switch got flipped but idk.

[mikel]

Id recommend looking into a custom tune for optimal performance with that intake.

[Weston]

Hi, thanks so much. I assumed I would need one and got the i3 to get one later, but I was hoping I could put one of the of the shelf tubes on it and enjoy that while I save for a custom one. Would one of the other tunes on the i3 platinum be better, or is there other parameters on it that might make it not stall.

I do plan on a custom tune, but I can’t right now and don’t want to be scared of my car before I do.

[mikel]

hard to say without a log to know what its doing and what it needs.

Id suggest not going WOT until you have a tune for the setup.

[Weston]

Ok, will do. I’ll get a log and send it here and a tuner. I was thinking hemifever, I’ve heard good and I think it’s a good price. Would you suggest them or is there a better option for a similar or less price?

And for the log, is there anything I need to do to get a useful log. I’ll start logging cold and let it warm up then drive it around through the gears and rpm range. Anything else you’d suggest?

[mikel]

log it doing the things it shouldn't do

Hemifever is a great choice.

[Weston]

Perfect, thanks I’ll do that and send it soon.

[Weston]

I tried to adjust the tune a little before running the data logging and my i3 wouldn’t turn on. I tried unplugging and replying it in then turning the key to on . I also drove my car around to make sure I had enough battery and it still didn’t work. I tried to go through returns to get a replacement, but nothing is happening, can you help me?

[mikel]

if it doesn't power up, chances are its a blown fuse in the car.
does it power up in a different vehicle?

[Weston]

I checked all of my fuses and they are good. I haven’t tried it in another car, but my code reader still works perfectly. It’s just the i3 that doesn’t work. Does the other car I use to check have to be a charger or just a car with a working obd2 port?

[mikel]

any vehicle with an OBDII port.
Does your i3 have the cable that unplugs at the bottom or its permanently connected?

[Weston]

It’s permanently connected

[mikel]

check for a bent pin in the connector.

[Weston]

Every pin is there and straight

[Weston]

It turned on with another car. What fuse or fuses should I change?