NHTSA Complaint #11322934 — 2013 CHEVROLET SILVERADO 1500

AFM SYSTEM CAUSES CYLINDERS 1 AND 7 TO FOUL THE SPARK PLUGS ACTUALLY CAUSING THE PORCELAIN TO BREAK OFF IN THE COMBUSTION CHAMBER. THE AFM IS OBVIOUSLY AN ENGINEERING FAILURE AND SHOULD HAVE BEEN RECALLED AND REPAIRED UNDER WARRANTY. PREVIOUS FIXES DO NOT WORK. MODIFYING THE VALVE COVER TO CORRECT A DESIGN FLAW IS NOT A CURE FOR THE REAL PROBLEM, WHICH IS A DESIGN FLAW. #1 AND #7 FOUL OUT DUE TO THE COLLECTION OF CARBON DEPOSIT CAUSED FROM EXCESS OIL IN THESE CHAMBERS WHICH CAUSES THE MALFUNCTION ENGINE LIGHT TO COME ON AND THE EVENTUAL CATALYTIC CONVERTOR FAILURE, POOR GAS MILEAGE AND POOR OVERALL PERFORMANCE, WITH EVENTUAL ENGINE FAILURE. LACK OF ACCELERATION, SLOW PERFORMANCE. FIRST NOTICED AT AROUND 30 TO 50,000 MILES AND PROGRESSIVELY BECAME WORSE. IDLE IS POOR DUE TO FOULED AND BROKEN PLUGS IN THESE TWO CYLINDERS AND THE ECU ATTEMPTING TO CORRECT THE ERROR THE BALANCE OF ENGINE IS THROWN INTO A UNBALANCED CONDITION CAUSING THE BUILDUP OF CARBON DEPOSITS IN THE ENGINE AND CAUSING THE SENSORS TO ATTEMPT TO CORRECT THE PROBLEM. PROBLEM IS UNIVERSAL AND NOT SPECIFIC TO A FEW SELECT VEHICLES BUT TO THOSE WITH THE AFM SYSTEM AND WAS OBVIOUSLY A PROBLEM SEVERE ENOUGH FOR GM TO CHANGE TO THE NEWLY DEVELOPED DFM SYSTEM WITHOUT ATTEMPTING TO ACTUALLY ADDRESS THE FLAWED AFM PROBLEM.