Problems · by component
1999 Ford Mustang engine and engine cooling problems
61 owner complaints to NHTSA about the 1999 Ford Mustang cite engine and engine cooling, 21% of all 297 complaints for this model year.
Complaints
61
21% of all complaints
Crashes
0
Reported by owners
Fires
0
Reported by owners
Injuries
0
Reported by owners
What owners say about the engine and engine cooling
Verbatim from NHTSA complaints, newest first
“TL*THE CONTACT OWNS A 1999 FORD MUSTANG. THE CONTACT STATED THE VEHICLE HAD A CRACKED MANIFOLD AND IT WAS LEAKING ANTIFREEZE. THE VEHICLE WAS TAKEN TO A MECHANIC WHO STATED THAT THE MANIFOLD NEEDED TO BE REPLACED. THE DEALER WAS CONTACTED AND OFFERED NO ASSISTANCE. THE MANUFACTURER INFORMED HIM THAT THERE WERE NO RECALLS OR WARRANTIES AND OFFERED NO ASSISTANCE. THE FAILURE MILEAGE WAS 67,000.”
“HEARING A EXHAUST LEAK LIKE NOISE AND AROUND THE SPARK PLUG THERE IS AIR COMING OUT OF THE HEADS CAUSING THEM TO EVENTUALLY BLOW OUT AND I WILL BE VERY UPSET IF FORD DON'T REPLACE IT SINCE IT IS HAPPENING TO ALOT OF CARS!!! *TR”
“SLOWING DOWN FOR A STOP SIGN WHEN THE 3 RD SPARK PLUG BLEW OUT ON THE PASSENGER SIDE OF MY 1999 MUSTANG GT WITH A 4.6 V8 . IT ALSO DESTROYED THE COIL ON TOP OF THE PLUG. *TR”
“I HAVE EXPERIENCED A SPARK PLUG BLOWOUT IN MY 1999 FORD MUSTANG WITH 4.6L V8. I HAVE SINCE READ ABOUT THE VULNERABILITY OF THESE ENGINES TO EXPERIENCE SPARK PLUG BLOWOUT. THE FIRST BLOWOUT WAS EXPERIENCED PRIOR TO CHANGING ANY SPARK PLUGS AND THEREFORE CAN NOT BE DEEMED TO BE A CAUSE OF IMPROPER TORQUING, ETC. A HELI-COIL WAS USED TO REPAIR THE SPARK PLUG BLOWOUT, ONLY TO HAVE THE SPARK PLUG BLOWN OUT AGAIN AT A LATER DATE. THIS TIME THE CYLINDER HEADS WERE DAMAGED AND REQUIRED REPLACEMENT. THE CYLINDER HEAD REPLACEMENT WAS A MAJOR INCONVENIENCE BOTH IN COST OF REPAIR, AND IN THE SEVERITY OF THE MALFUNCTION. I AM VERY DISTURBED TO HEAR THE NUMBER OF COMPLAINTS AND NUMBER OF OTHER INDIVIDUALS WHO HAVE EXPERIENCED THIS SAME PROBLEM WITHOUT ANY PROPER RECOGNITION OR ACTION BY FORD. I AM FILING THIS COMPLAINT TO DRAW MORE ATTENTION TO THIS ISSUE AND PERHAPS GET SOME FEDERAL ACTION AGAINST FORD FOR THIS ISSUE. I BELIEVE THAT OWNERS LIKE ME SHOULD BE COMPENSATED FOR THE REPAIRS DONE AND THE STRESS/INCONVENIENCE ENCOUNTERED DUE TO THIS MANUFACTURER DEFECT. *TR”
“SPARK PLUG BLOW OUT. THERE WAS REALLY NOTHING THAT LED UP TO THIS THAT I KNOW OF. APPARENTLY THIS IS SOMETHING THAT HAPPENS A LOT TO FORD VEHICLES (I HAVE A 99 MUSTANG V8). FORD RECOMMENDED A NEW HEAD ($2000). AN ALTERNATIVE WAS TO RETAPE THE HEAD ($800). *TR”
“1999 FORD MUSTANG GT APPEARS TO HAVE CRACK IN PLASTIC INTAKE SYSTEM, AND IS LOSING COOLANT. PREVIOUSLY OWNED A 1997 MUSTANG GT, AND THIS WAS REPLACED UNDER A RECALL. I CAN NOT FIND ANY INFO RELATING TO THE SAME PROBLEM WITH THE 1999. *TR”
Showing 6 of 61 reports. Read every report on NHTSA.gov.
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 27, 2026NHTSA vehicle page
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.