sr20det sputtering after 4000rpm

[blownmotor]

mmy sr20det starts sputtring at 4000rpm @ wide open throttle and half throttle or when the turbo starts spooling hard only boostng at 8psi checked tps and is ok son dont know what it going on theres no MIL so far it's getting worse use to do it at 5500rpm any help is appreciated thanks :)

[CylonFrakker]

check the plugs, and check the vacuum lines. Also what does your boost read at 4000+ RPMs

[blownmotor]

8psi at full throttle

[blownmotor]

checked all vacum and plugs all seems fine

[nissan90sileighty]

start simple, like stated, check vacuum lines dont bother with the plugs yet... and change your fuel filter, thats what it sounds like it could be... if you still have the problem then look deeper in to it

[georgesal]

my car sputters too. but runs great at half throttle, but there are times it just runs like a champ. weird i've been meaning to change the coolant temp sensor.

[blownmotor]

fuel filter is new when i swapped my motor and the car has less than 5k on it since only thing i could think of really is maf tps or maybe the coolant temp but why would the coolant temp make it sputter and cant seem to find the tps voltalge spec either

[steve shadows]

shotty wiring can do this too, especially maf wiring, also make sure your car and battery etc is grounded properly and your harness is not hacked by the ecu, I used to have a lot of problems like this, turned ou getting rid of the afc help, more the hack than the actual unit, but it sucks too.

[nrg]

bad maf or coil pack. /thread