There are 1 owner-reported fuel system complaints for the 2010 Mercury Grand Marquisin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
THROTTLE BODY FAILURE__ ENGINE GOES TO DEAD IDLE AT HIGHWAY SPEEDS, LEAVING THE DRIVER AND PASSENGERS HELPLESS TO EXIT ONTO THE BREAKDOWN LANE OR SHOULDER IF YOU ARE NOT IN THE RIGHT HAND LANE WHEN IT HAPPENS, IE IF YOU ARE ON A 70 MPH INTERSTATE IN THE CENTER LANE WITH VEHICLES PASSING YOU ON BOTH SIDES WHILE YOU ARE HELPLESSLY COASTING TO A STOP UNABLE TO REMOVE YOURSELF FROM THE CENTER LANE, YOU WOULD BE SUBJECT TO CAUSE A CHAIN REACTION ACCIDENT. FORD REFUSED TO FIX THIS VEHICLE AT THEIR EXPENSE, AND WANTED TO CHARGE ME $189 DOLLAR FEE TO ANALYSE THE PROBLEM, WHEN THEY ALREADY KNEW WHAT WAS WRONG,(ACCORDING TO THE TECH PERSON I SPOKE WITH WHO SAID THEY HAVE REPLACED HUNDREDS OF THESE DEFECTIVE PARTS) THE PART COST $543 DOLLARS NOT INCLUDING LABOR ON A VEHICLE WITH 71 THOUSAND MILES ON IT. THIS IS AN EXTREMELY DANGEROUS SITUATION AND SHOULD BE RECALLED ASAP
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026