Need help on a sputtering problem
Need help on a sputtering problem I have a 94 z28 with the current mods:
3500 stall
Built Tranny
Full exhaust
CAI
1.6 RR
Hotcam
.030 bored
and a walboro 255 fuel pump.
My problem is the 1-2 shift and SOMETIMES the 2-3 shift.
When you put the car in first, and floor it, it gets to 5500-7000 and stars sputtering. same on the 2-3.
4-5 seconds is where its at.
3500 stall
Built Tranny
Full exhaust
CAI
1.6 RR
Hotcam
.030 bored
and a walboro 255 fuel pump.
My problem is the 1-2 shift and SOMETIMES the 2-3 shift.
When you put the car in first, and floor it, it gets to 5500-7000 and stars sputtering. same on the 2-3.
4-5 seconds is where its at.
its not, it was in drive, and it never sputtered up top until the pcm went out and we got a flashed replacement. springs are rated @ 550, or 600. hes saying that somewhere in that rpm range it cuts out.
TECH Veteran
Joined: Apr 2008
Posts: 4,985
Likes: 112
maybe the rpm shift point for the 1-2 shift needs to come down...as a guess
you could rule out fuel problem by taping a FP gauge to windshield and go for another "sustained WOT" run...it it drops, especially during your stumble....fuel pump and or wiring needs attention
....might want to speak with whoever tuned it
maybe the rpm shift point for the 1-2 shift needs to come down...as a guess
you could rule out fuel problem by taping a FP gauge to windshield and go for another "sustained WOT" run...it it drops, especially during your stumble....fuel pump and or wiring needs attention
maybe the rpm shift point for the 1-2 shift needs to come down...as a guess
you could rule out fuel problem by taping a FP gauge to windshield and go for another "sustained WOT" run...it it drops, especially during your stumble....fuel pump and or wiring needs attention
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It would be a good idea to get a valve spring tester before throwing parts at it. You will only be able to test the first two cylinders on each side, but odds are, that should give you an idea of what's going on.
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Verdad Gallardo The springs are rated at .650. The tuner said it was running 15 percent rich idle through wot. So he leaned it out and the sputtering got worse.
I dont think it done this until we got the new fuel pump
I dont think it done this until we got the new fuel pump