Hi guys looking for some help diagnosing a cylinder 1 misfire on my 2004 wrx.
Mods
K/n Typhoon intake
Invidia up + downpipe(catted)
DW fuel pump
sti pinks
cobb 3 port ebcs
perrin turbo inlet
grimspeed aos
protuned with cob AP v3
Problem
Cylinder 1 will occasionally misfire when engaging the clutch(Car goes under load). Typically happens after taking off from a stoplight but can also occur when shifting up or down.
Sluggish at low rpm(<2000).
CEL is present. Cylinder 1 CEL + rarely a Cat insufficiency CEL
Idle is somewhat rough. I can hear it fluctuate between two different tones. NO CEL or misfires at idle.
Info from Cobb AP
DAM is consistent 16
AFR is ~14 at idle
Air Fuel Correction is ~negative 10. AF learning A1 ~negative 14. Car is pulling lots of fuel at idle?
I hit target boost(17.5psi)
Attempted Solutions
New spark plug(NGK Iridium)
New coil(OEM)
New fuel injector(OEM sti pink)
Compression tested cylinder 1: 155psi
Possible Solutions?
Clean IACV. Waiting on a gasket to do this.
Replace front 02 sensor. Part is expensive so I don't want to just replace it without knowing if it's the problem.
Mods
K/n Typhoon intake
Invidia up + downpipe(catted)
DW fuel pump
sti pinks
cobb 3 port ebcs
perrin turbo inlet
grimspeed aos
protuned with cob AP v3
Problem
Cylinder 1 will occasionally misfire when engaging the clutch(Car goes under load). Typically happens after taking off from a stoplight but can also occur when shifting up or down.
Sluggish at low rpm(<2000).
CEL is present. Cylinder 1 CEL + rarely a Cat insufficiency CEL
Idle is somewhat rough. I can hear it fluctuate between two different tones. NO CEL or misfires at idle.
Info from Cobb AP
DAM is consistent 16
AFR is ~14 at idle
Air Fuel Correction is ~negative 10. AF learning A1 ~negative 14. Car is pulling lots of fuel at idle?
I hit target boost(17.5psi)
Attempted Solutions
New spark plug(NGK Iridium)
New coil(OEM)
New fuel injector(OEM sti pink)
Compression tested cylinder 1: 155psi
Possible Solutions?
Clean IACV. Waiting on a gasket to do this.
Replace front 02 sensor. Part is expensive so I don't want to just replace it without knowing if it's the problem.