Hi All,
Been trying to solve an issue for a while now with no luck. Wondering if someone on here has some advice
Symptoms :
- P21F9 code on VCDS
- Rough Idle when up to temp
- Missfires after 30 or so mins idling
- Excessive overrun pops due to running rich
- Negative ST and LT fuel trims
- Drives fine once on throttle, no sign of lost power
Replaced:
- All 4 Direct Injectors
- Intake Manifold
- Port injectors (MPI) on the Intake Manifold
- PCV
- Both O2 sensors
- All 4 Spark Plugs
- Multiple Oil Changes
Everthing replaced is OEM
Any Ideas anyone ?
Both HPFP and LPFP actual values are matching specified values
Also done the fuel rail pressure test and pressures are correct
Mods
- Resonator delete
- Intake Airbox Mod (panel filter)
- Turbo Technics intake pipe
- Upgraded intercooler
- Standard, plans are to go stage 2.
Any help would be appreciated
Thanks
Dave
Been trying to solve an issue for a while now with no luck. Wondering if someone on here has some advice
Symptoms :
- P21F9 code on VCDS
- Rough Idle when up to temp
- Missfires after 30 or so mins idling
- Excessive overrun pops due to running rich
- Negative ST and LT fuel trims
- Drives fine once on throttle, no sign of lost power
Replaced:
- All 4 Direct Injectors
- Intake Manifold
- Port injectors (MPI) on the Intake Manifold
- PCV
- Both O2 sensors
- All 4 Spark Plugs
- Multiple Oil Changes
Everthing replaced is OEM
Any Ideas anyone ?
Both HPFP and LPFP actual values are matching specified values
Also done the fuel rail pressure test and pressures are correct
Mods
- Resonator delete
- Intake Airbox Mod (panel filter)
- Turbo Technics intake pipe
- Upgraded intercooler
- Standard, plans are to go stage 2.
Any help would be appreciated
Thanks
Dave