I have a 420a turbo (cx racing turbo kit with 12:1 vortec fmu narrow band afr gauge,boost gauge, 255 walbro pump) which when i try running wot it spits and sputters and falls on its face but when i let off to about 1/3 peddle it runs normal with rpm going up an mph goes up with no problem...but the car was doing this before the turbo iv replaced both o2 sensors and map sensor (throttle body was dirty when i replaced map sensor) i dont know whats wrong with it...iv heard it can be the tps or that i need the fcd im still waiting for PLEASE HELP!

Originally posted by plv_420a
I have a 420a turbo (cx racing turbo kit with 12:1 vortec fmu narrow band afr gauge,boost gauge, 255 walbro pump) which when i try running wot it spits and sputters and falls on its face but when i let off to about 1/3 peddle it runs normal with rpm going up an mph goes up with no problem...but the car was doing this before the turbo iv replaced both o2 sensors and map sensor (throttle body was dirty when i replaced map sensor) i dont know whats wrong with it...iv heard it can be the tps or that i need the fcd im still waiting for PLEASE HELP!

You need a fcd, your running into something called fuel cut, that the ECU does when boost is introduced!

well it was doin this before it was turbocharged...but the down streem o2 sensor was broken so i replaced it when i turbod it but ended up doin the same thing only now i can rev it upin neutral

I thought the same with it being fuel cut, but if it did the same thing before installing the Turbo kit then I would say check your sparkplug wires?

i looked at my sparkplug wires they looked ok and i can smell fuel on themnbut i know looks can be deceiving...how can i tell if theyre bad

bump

Originally posted by plv_420a
i looked at my sparkplug wires they looked ok and i can smell fuel on themnbut i know looks can be deceiving...how can i tell if theyre bad

replace them lol. also is your fmu set up correctly? when i turboed mine i did a woopsie and screwed that up. Tell us how your set up is hhooked up.