New engine, popping under boost??

[farmtruc]

Valve float, broken valve spring, poor sealing valve seat, cam advanced or retarded, low fuel pressure, faulty MAF (if MAF tune), CKP failure, loose reluctor, incorrect reluctor....

valve float at 4krpms and 3psi with good springs, probably not, but i'll check the springs, a bad spring could cause valve float.
could be poor sealing valve, i'll check that.
cam in straight up, runs too good under no boost conditions.
fuel pressure, rock solid! a1000, -10 line everywhere, aero fpr.
no maf
i hope it's not ckp or wheel, that would suck!
i don't think it's the wrong wheel, it would backfire and spit randomly and a lot more often.

i say some plug wires burned on the turbo manifold.....like mine did on us.....lol

changing those tomorrow.

[Jamest]

Do you remember when you had mine on the dyno? It ran good until you got on it and started sputtering. Turned out to be a burn plug wire.

valve float at 4krpms and 3psi with good springs, probably not, but i'll check the springs, a bad spring could cause valve float.
could be poor sealing valve, i'll check that.
cam in straight up, runs too good under no boost conditions.
fuel pressure, rock solid! a1000, -10 line everywhere, aero fpr.
no maf
i hope it's not ckp or wheel, that would suck!
i don't think it's the wrong wheel, it would backfire and spit randomly and a lot more often.


changing those tomorrow.

[ChevyLee]

fuel pressure regulator?