1999 Mercury Grand Marquis engine problems
The 1999 Mercury Grand Marquis has 34 engine complaints filed with NHTSA — 17% of the year's total, and roughly flat versus the prior model year.
34
Engine complaints
17%
Share of year
0
Crash-involved
0
Related recalls
Engine complaints by year
What owners report
“DT*: THE CONTACT STATED WHILE DRIVING 40 MPH, THE ENGINE HESITATED AND IDLED BADLY AT A STOP. THE CONTACT REPLACED THE FUEL FILTER, BUT PROBLEM CONTINUED. WHEN TAKEN TO AN INDEPENDENT SERVICE DEALER, THE DIAGNOSTICS SHOWED THE MANIFOLD WAS CRACKED. THE MANUFACTURER WAS NOTIFIED. THE CONSUMER STATED…”
Common questions
How many engine complaints does the 1999 Mercury Grand Marquis have?
NHTSA has 34 complaints about the 1999 Mercury Grand Marquis engine — 17% of all complaints filed for that model year.
Related
Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.
Compiled by Sharon Ben-Moshe, Founder.