2004 GMC Yukon XL
Mileage
136,540
Service Date
1/18/2022
Services Performed
- UPON EVALUATION, FOUND LONG TERM FUEL TRIMS AROUND +25. SHORT TERM 0, FOUND CODES IN PCM AS FOLLOWS : P0101 – MASS AIR FLOW SENSOR PERFORMANCE, P0171 – BANK 1 LEAN, P0174 – BANK 2 LEAN, P0300 – CYLINDER MISFIRE. CLEARED FUEL TRIMS TO FIND RUNNING ROUGH CONDITION, AND SHORT TERM FUEL TRIMS ROSE QUICKLY. UPON RISE, REMOVED MASS AIR FLOW SENSOR CONNECTOR TO FIND FUEL TRIMS COME BACK DOWN TO ZERO. INSPECTED MAF FOR DEBRIS TO FIND SENSOR CLEAN, INSTALLED NEW TO VERIFY NO ISSUE WITH MAF SENSOR. FOUND NO CHANGE IN FUEL TRIMS WHEN NEW SENSOR WAS INSTALLED, REMOVED NEW SENSOR. MONITORED FUEL TRIMS TO FIND HIGH SHORT TERM. SPRAYED AROUND INTAKE MANIFOLD TO FIND SHORT TERMS TRIMS CLIMB DOWNWARD. ROAD TESTED VEHICLE TO FIND FUEL TRIMS NORMAL IN DRIVING CONDITION. WILL NEED INTAKE MANIFOLD GASKET SET/ INTAKE MANIFOLD.
- INTAKE MANIFOLD – Remove & Replace – 5.3L Eng
Janos R. gave our service a 5 star review on 1/24/2022
