HELP launch problem is back!!!!

[1fast97gsx]

I'm getting so pissed off at stupid stuff like this. A while back I had a problem and it was everytime I launched my gsx it would take off for like 20 feet, then fall on it's face and make a loud pop, and then take off again. After a few posts on here and a lot of time testing things and asking around I tried changing out the cam angle sensor with a brand new one and I launched it twice and it was fine. Well tonight I launched the car again ( 1st time since then ) and the same problem is back again. I tested and retested the car for boost leaks and that's not it. I also threw in a different set of plugs and wires and still same problem. Injectors have also been swapped out and it still does it. What could be causing this?!?! I tried 2 ecus as well.

1 thing I never considered until tonight is a missadjusted or broken tps. For all you safc people ... when you just let the car idle ( no foot on the gas pedal ) what will the safc give you for your tps voltage ( go to sensor check and look at the 3rd one ) Mine reads .71 .. seems ok to me but who knows. What else could be left??!?!

I know its not my tuning because I datalogged a 3rd gear run and my timing curve is nice and smooth with 20 degrees at 7300 rpm and no dips. O2 voltage is at .92ish.

 

[gsxtacy]

Sounds like its loading up. A loud *pop* is a really rich thing. I saw DSMLINK is your fuel control.

I bet you run colder plugs right? BPR7ES's ??
What is your plug gap with that much boost?

Damn I wish I could help you.

Go with BR7ES plugs and see. I recommend them to anyone who is more than 50% modded. .026" Gap was the magic number for me to eliminate my ignition problems over 18 psi.

gsxtacy

 

[1fast97gsx]

I'm running those plugs gapped at .028. Dsmlink is not yet installed so I'm still running an eprom ecu with an safc. I don't think it has anything to do with tuning, because according to a datalog O2s are right where it should be. I don't think running slightly rich will cause the car to just jerk like I stalled it out or whatever and then start pulling again either. Thanks for the ideas.

 

[1fast97gsx]

I will seriously give someone money that tells me whats wrong

 

[Goobdog]

On my afc my tps shows .75. It sounds like youre hitting fuel cut if you ask me but im sure you've ruled that out.

 

[1fast97gsx]

isn't fuel cut more likely to happen in higher gears? How can I find out for sure if that's what it is?

 

[boostedinaz]

I have never driven a 2G that hit fuel cut, but in a 1G it is crazy. Feels like you hit a brick wall and then all is fine. The first time I did it I almost crapped my pants. I have hit it in first gear before and a few times in second gear.