Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1978 Grand Marquis.
The 1978 Mercury Grand Marquis, with only a single owner complaint on record—focused on the electrical system—and zero recalls, stands as an exceptionally trouble-free entry in the model’s history. While the broader Grand Marquis complaint data covers 1990 through 2011, peaking at 487 complaints in 2005, the 1978 model year sits entirely outside that range, meaning its lone electrical issue and clean recall record are not part of that later trend. This places the 1978 as a notably low-maintenance early example, suggesting that for researchers, this year represents a quiet baseline before the model’s complaint volume escalated in subsequent decades.
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
The 1978 Mercury Grand Marquis generated only one target-year federal complaint, categorized under the electrical system, with zero crash- or fire-related incidents and no root cause specified in the data. The provided year-by-year federal record does not contain entries prior to 1990, so direct comparison with years immediately before and after the model year is not possible; the earliest observable data point in 1990 shows 61 complaints, one recall, one investigation, and 36 TSBs. From that 1990 baseline, the record trends upward through the 1990s and early 2000s, reaching a peak of 487 complaints in 2005 before receding to just nine complaints by 2011. This positions the 1978 model year well before the arc’s high-activity period, implying it aged into its federal record with relatively modest early exposure. Given the minimal target-year complaint volume and the lack of early-calendar-year red flags in the dataset, 1978 stands out as a sound model year to purchase assuming a thorough pre-buy inspection.
All 1 complaints on record, top 1 components.
Source: NHTSA Office of Defects Investigation complaint database.
No recall campaigns on record with NHTSA for this vehicle as of the last data refresh.
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Cross-vehicle references for the kinds of data on this page.
NHTSA lists 0 recall campaign(s) for this model year. Check your specific vehicle by VIN.