Well I'm about 50 miles on my rebuild and well drives good in low rpms then I get to 3500-4000 rpm and it lags like hell unless i really ease into it. so I pulled my upper intake to check my ecu ground and clean it up. I then notice I had gas leaking from the rear secondairy I pulled it off and the o rings look fine and my fuel rail was torqued down to specs so its gotta be the o rings. So I'm gonna order some new ones from Atkins right now. do u think that could be a reason to y it's lagging like that or should I look more into the grounds or wat should I look for?

 

Yeah if your lag starts when your secondaries kick on and your secondaries are leaking bad then I would assume the same thing. I just fixed a leak on my primary rail yesterday.

Also this is kinda technical and lacking pics to be in this section lol.

 

Lol wow I defiantly didnt mean to post this here lol my bad

 

Check your TPS as well. My S5 TII did the same thing, and the issue was the full range on the TPS.

 

20 bucks says its the leak. Car lags when secondaries kick on, secondary rail has bad leak, 1+1=......

 

if your injetors are leaking send them to rc engineering they can clean and balance them for you to what they are suppose to flow and the price is really cheap to have it done check there website www.rceng.com

 

Not leaking into motor, leaking outside of the motor, as in the kind of leaks that start fires.