peter zippy reid

iTrader: (25)

My car 03 sti jdm jerks badly and stutters misfires bogs down as if no fuel but just when first started when it reaches temp its fine is this coil/plugs or earthing

peter zippy reid

iTrader: (25)

Forgot car came with earthing kit and i took it off as it was a mess also changed 02 sensor cts maf sensor

chieftain333

Had the same issue and it was a bad coil pack

peter zippy reid

iTrader: (25)

Cheers mate have bought a set will be here tomorrow

peter zippy reid

iTrader: (25)

Changed coil packs and new plugs still the same parts changed so far
Cts
02 sensor
Maf sensor
Coil packs
Plugs
Whats left to check

kevo10

boost solenoid,dirty throttle body, dirty icv

peter zippy reid

iTrader: (25)

Cleaned icv will try boost solenoid and throttle body only does if water temp gauge is below 50 degrees

peter zippy reid

iTrader: (25)

Once over 60ish its fine

CutMasterT

iTrader: (2)

Have you checked for any CEL codes?

As above I would clean out the ICV and replace the gasket to see if that helps.

I had similar issue and went through the annoying process of randomly changing parts in the hope that it could fix it.

On mine I replaced:

PCV
Coil packs
Bosche O2 Sensor
Throttle body + position sensor
CTS
Crank Sensor
Walboro fuel pump
Fuel Filter
ICV clean + Gasket

TBH it might be cheaper and easier to drop it off with a Subaru specialist, if I total up the cost of changing all the parts that didn't need changing I could have paid for the diagnoses and repair 3 times over lol

peter zippy reid

iTrader: (25)

No codes and icv cleaned and gasket replaced what was weird this morning i primed car 4 times car started but was revving at 2800rpm gave throttle quick blip went down to 1000rpm and drove without stutter/chugging bogging down

CutMasterT

iTrader: (2)

What fuel pump have you got? Could be worth changing to a Walboro uprated one if not already done. Its one less thing to rule out I guess and easy enough to change.

Out of interest does the outside temperature have any effect on the problem? Ie when its hotter it doesn't do it as much.. etc

peter zippy reid

iTrader: (25)

Walbro fitted and outside temp makes no difference wether -2 or +9 car was mapped in end of oct ran fine then end of nov scoobyworx fuelpump chucked it then had issues since

peter zippy reid

iTrader: (25)

Just went out in car its been sat for 5hrs water temp was 34degrees outside temp 9degrees start first turn everytime drove out street to main road then stutter chug bogging if i more than feather throttle

CutMasterT

iTrader: (2)

Might be worth getting the map looked at again, just to see if everything is as it should be.

peter zippy reid

iTrader: (25)

Starting to think i will need to do that

peter zippy reid

iTrader: (25)

Car still no better feels like its choking when i anymore than feather throttle