NHTSA Complaint #10730504 — 2012 FORD F-150

24,991MI: MISFIRE WHEN ACCELERATING WHILE DRIVING. NO CHECK ENGINE LIGHT. DEALER REPORTED NO PROBLEM FOUND, NO CODES & MADE NO REPAIRS. 29,440MI: MISFIRE WHEN ACCELERATING & GOING UP & DOWN HILLS SPECIFICALLY WHEN IN 4,5, 6 GEAR DURING BOTH FLAT & INCLINED HIGHWAY DRIVING. THIS WAS WHILE PULLING AN 8000LB TRAILER. NO CHECK ENGINE LIGHT. DEALER FOUND MISFIRE IN #1 & 4 AND REPLACED COILS & PLUGS IN #1 & #4 ONLY. TEST DRIVE STILL SHOWED MISFIRE, THEN REPLACED TURBO BOOST PRESSURE SENSOR. I WAS TOLD THAT MOISTURE HAD DAMAGED THE PLUGS & SENSOR. 35,214MI: MISFIRE WHEN TAKING OFF FROM A STOP, DURING NORMAL ACCELERATION AND GOING UP HILLS.NO CHECK ENGINE LIGHT. DEALER REPLACED THE DRIVERS SIDE EXHAUST MANIFOLD BECAUSE IT WAS WARPED. 37,164MI: MISFIRE WHEN TAKING OFF FROM A STOP, DURING NORMAL ACCELERATION & GOING UP HILLS. I SAW THIS IN ACCELERATION CONDITIONS FROM 10-60MPH WITHOUT TOWING A TRAILER. NO CHECK ENGINE LIGHT. DEALER REPORTED NO PROBLEM FOUND, NO CODES & MADE NO REPAIRS. 38,577MI: REPEATED SEVERE MISFIRES WHILE GOING UP MODERATE INCLINES. CHECK ENGINE LIGHT CAME ON (FIRST TIME THIS EVER HAPPENED) & I HAD A REDUCTION IN POWER, COULD NOT GET OUT OF 3RD GEAR & MY SPEED DROPPED FROM 65MPH TO 50MPH. AFTER REPAIR HAD MODERATE MISFIRES DURING MAJOR INCLINES WHILE TOWING A TRAILER BUT NO CHECK ENGINE LIGHT. 39,000MI: WHILE TOWING A TRAILER, EXPERIENCED SERIES OF MODERATE TO SEVERE MISFIRES IN WAVES BE OK FOR AN HOUR & THEN GO INTO A SERIES OF MISFIRES FOR 3-10 MINUTES. SOME WERE ON HILLS, SOME WERE ON FLAT HIGHWAY DRIVING. I HAD 5 OCCURRENCES WHERE THE CHECK ENGINE LIGHT CAME ON DURING THIS DRIVE. 3 OF THESE WERE DURING A HILL CLIMB WHERE I HAD A POWER REDUCTION & LOST SPEED. VEHICLE STAYED IN 3RD GEAR. WHEN I WOULD GET A SERIES OF SEVERE MISFIRES, MISFIRES WERE SO SEVERE (WITHOUT THE CHECK ENGINE LIGHT ON), THAT I COULD HEAR & FEEL THE TURBO KICK OFF & ON..