Need help! Possible fuel cut!

[99GST83]

(99 GST) Recently I have noticed one hell of a bucking/jerking at WOT/full boost (10lbs). If I keep it at 80% throttle and 8lbs of boost, its ok, but as soon as I give it a little more, she bucks hard. I have an intake, 16g turbo, Forge BOV (not recirculated), 3'' cat-back, re-wired fuel pump, and replaced fuel filter. It has only recently started doing this. I double checked intake piping and all camps are tight and cant find any obvious problems.

Anyone else have trouble like this, and if so, how did you fix it...

Any advice would be GREATLY helpful...

Thanks again.... WTF

 

[my dreamt dsm]

Just don't tighten the clamps. Air is invisible so you'll need to hear it. the only way is boost leak test. Also check your spark system.. wires, plugs, coil packs. I WAS having the same problem.

 

[99GST83]

ok, how did you fix it. (did you have a boost leak or was it an ignition problem?)

 

[my dreamt dsm]

ok, how did you fix it. (did you have a boost leak or was it an ignition problem?)

I was running really lean plus boost leak buy the throttle body, spark plug wires change and plugs change. Problem solved. Good luck!

 

[williillii]

Sounds like ignition break up from what you're describing. When you gas it all the way does it kinda sputter and pop? I had a coil that arced (dead coil now haha) and any boost at all, and my car would sound like a machine gun.

 

[bjmauck]

Fuel cut feels like you get kicked in the back. If it's sputtering I would check ignition. Plug gap and wires.

 

[99GST83]

no sputtering or warning of any kind. I get full boost for about 2 seconds then suddenly cuts out for a split second. Feels like I hit a brick wall suddenly. no CEL or anything.

 

[bjmauck]

Sounds more like fuel cut. I would say boost leak test. Your bov may not be holding full boost and releasing it causing the fuel cut. You fuel cut when the MAF sees to much air flow so your loosing air somewhere. You should be able to run around 14-15 Pei

 

[99GST83]

i'll do a boost leak test on it tomorrow and see whats goin on. I'm only running 10lbs because I have the wastegate adjusted as far as I can, and it dosen't give me any more threads to adjust it. Unless I put some washers behind the wastegate mount to tighten it up a little more.

 

[bjmauck]

You don't have a boost controler? After you get your porblem fixed and you want to run more boost I would suggest the ECU flash. That's what I have in my car and love it. You can tune yourself. All you would need is a wideband and a laptop to tune. The price isn't bad either.

 

[99GST83]

UPDATE!!! I am now not able to run any boost. I found a fuel injector that cuts out under any kind of load. And there isn't a single used auto parts place around here that has a turbo ANYTHING! I found thousands of injectors, but the impedance isn't correct on them. This SUX!!!!!!!1