Hello there,
I'll cut to the chatę - I'm having very high LTFTs, especially after long cruising - nearly every time after long, calm driver, CELs are thrown, usually on both banks. Right now Mixture Control CELs are the only one thrown.
The next day car starts but idle is rough - like there's too much fuel - after coupe of seconds it gets better, after adaptation reset or hard driving the day before, there are no problems with idle.
I've this problem since I've got the car - now I'd like to fix it, especially after my main rod bearing spun and I've rebuilt the motor, but the problem isn't get way.
The ECU model is MSD81
Most important changes to engine:
Wagner EVO 3 IC
Catless high flow downpipes
Vargas GC turbos - after rebuilt - no issues with tchem
Fuel pump overdrive (with kit designer by Hydra Performance)
Vrsf chargepipe with HKS BOV
MHD stage 2+
Relocated inlets
Walbro 525 fuel pump
EKP with new thermopads - no issues there
Things I've done to troubleshoot:
All 4 o2 sensors replaced with new Bosch
Checked and cleaned injectors (index 12), coded to the car - no leaks, now and before
2 steps colder NGK plugs, new Delphi coils
3.5 bar map sensor, coded with MHD
Walnut blast head ports
New rail pressure sensor
ECU checked for damages
Checked other HPFP
Compression test - was fine before and after rebuild
I'm running out of ideas - the only one left is that aftermarket downpipes don't have the beat fitment and I had to used double gasket for one pipe before catback. But honestly LTFTs ale very close, I don't really believe that could be a cause.
If I'm getting it right, high LTFT on both banks could be caused by:
- air leak in intake manifold
- exhaust leak after turbo
- exhaust leak near rear O2 sensors
- faulty O2 sensors
- faulty rail pressure sensor
- faulty TPS sensor
Is there something to log to narrow down possible solution? LTFT x RPM x Lambda?
It seems that the biggest LTFT os measured while cruising.
Thank you
I'll cut to the chatę - I'm having very high LTFTs, especially after long cruising - nearly every time after long, calm driver, CELs are thrown, usually on both banks. Right now Mixture Control CELs are the only one thrown.
The next day car starts but idle is rough - like there's too much fuel - after coupe of seconds it gets better, after adaptation reset or hard driving the day before, there are no problems with idle.
I've this problem since I've got the car - now I'd like to fix it, especially after my main rod bearing spun and I've rebuilt the motor, but the problem isn't get way.
The ECU model is MSD81
Most important changes to engine:
Wagner EVO 3 IC
Catless high flow downpipes
Vargas GC turbos - after rebuilt - no issues with tchem
Fuel pump overdrive (with kit designer by Hydra Performance)
Vrsf chargepipe with HKS BOV
MHD stage 2+
Relocated inlets
Walbro 525 fuel pump
EKP with new thermopads - no issues there
Things I've done to troubleshoot:
All 4 o2 sensors replaced with new Bosch
Checked and cleaned injectors (index 12), coded to the car - no leaks, now and before
2 steps colder NGK plugs, new Delphi coils
3.5 bar map sensor, coded with MHD
Walnut blast head ports
New rail pressure sensor
ECU checked for damages
Checked other HPFP
Compression test - was fine before and after rebuild
I'm running out of ideas - the only one left is that aftermarket downpipes don't have the beat fitment and I had to used double gasket for one pipe before catback. But honestly LTFTs ale very close, I don't really believe that could be a cause.
If I'm getting it right, high LTFT on both banks could be caused by:
- air leak in intake manifold
- exhaust leak after turbo
- exhaust leak near rear O2 sensors
- faulty O2 sensors
- faulty rail pressure sensor
- faulty TPS sensor
Is there something to log to narrow down possible solution? LTFT x RPM x Lambda?
It seems that the biggest LTFT os measured while cruising.
Thank you
