R32gtr sputtering and stalling

[thejacksta88]

Hi guys,

I know I lt could be a range of issues although when driving my gtr its starts sputtering and stalling feels like maybe an inter cooler pipe loose or so but that's not the case.

recently had a comp check with 165psi across all 6 give or take a few psi.

a mate was saying maybe IAC valve 

could anyone point me in the direction of where to go from next I was thinking coils / plugs.

 

its due for an upgrade so I'm going to r35 coils. In the mean time I'm Just wanting to get it running alright 

 

cheers 

[Duncan]

when does it run badly; hot/cold/both, idle/part throttle/full throttle

what computer is running it and what data can you get from it?

[GTSBoy]

1 hour ago, thejacksta88 said:

a mate was saying maybe IAC valve

It won't be this - not while it's driving, anyway.

[joshuaho96]

2 hours ago, thejacksta88 said:

Hi guys,

I know I lt could be a range of issues although when driving my gtr its starts sputtering and stalling feels like maybe an inter cooler pipe loose or so but that's not the case.

recently had a comp check with 165psi across all 6 give or take a few psi.

a mate was saying maybe IAC valve 

could anyone point me in the direction of where to go from next I was thinking coils / plugs.

 

its due for an upgrade so I'm going to r35 coils. In the mean time I'm Just wanting to get it running alright 

 

cheers 

What do LTFTs look like? What do MAF voltages look like? O2 sensor voltages/AFRs? Knowing O2 voltages especially when it sputters would help a lot.

[MBS206]

10 minutes ago, joshuaho96 said:

What do LTFTs look like? What do MAF voltages look like? O2 sensor voltages/AFRs? Knowing O2 voltages especially when it sputters would help a lot.

How will O2 sensor voltages help to identify it when it is sputtering?

[joshuaho96]

8 minutes ago, MBS206 said:

How will O2 sensor voltages help to identify it when it is sputtering?

If it's reading full rich prior to a misfire that gives one directional hint, if it's already reading lean, etc. If it's reading pretty cleanly stoichiometric then suddenly drops out from a misfire that suggests it's not air mass estimation that's the problem. Could be ignition, could be something more subtle. Could be the CAS has decided to start dropping out at random or the drive pin is worn leading to excessive lash and trigger errors. LTFT can tell you the same but it's slower to react and if this is a recent issue it might not have stabilized. STFT stuck in one direction vs fluctuating back and forth can be used instead but I like to read O2 voltages anyways and interpret directly.

If the O2 voltages make no sense in general or are super slow to react it could also be a failing O2 sensor. There's no real error correction for failing O2 sensors in these cars.