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Discussion Starter · #1 ·
Hi good day,

I am new to this forum website and would like to introduce my self as Cameron Granderson, i am 24 years of age and i own a lancer 2005 4g18 engine.

I been experiencing negative fuel trims on my car.
symptoms include:
-12 LTFT
-11 to -13 STFT
When I step on the accelerator, the STFT goes to around +3 and the LTFT reduces to around -8 of -10 sometimes.
When the car is stopped, it goes back to -12 LTFT and around -11 to -13 STFT.
at idle i will have a bit of a rough vibration and a lack of acceleration power.


I replaced:
INJECTORS
AIRFILTER
FUEL PRESSURE REGULATOR
O2 SENSOR UPSTREAM
FUEL PUMP
MAP SENSOR
TPS
SPARK PLUGS
IGNITION COIL
CARBON CLEANED INTAKE MANIFOLD

I'm wondering if i may have an exhaust restriction.
 
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