Problems · by component
1998 Ford Mustang engine and engine cooling problems
91 owner complaints to NHTSA about the 1998 Ford Mustang cite engine and engine cooling, 28% of all 320 complaints for this model year.
Complaints
91
28% of all complaints
Crashes
4
Reported by owners
Fires
7
Reported by owners
Injuries
1
Reported by owners
What owners say about the engine and engine cooling
Verbatim from NHTSA complaints, newest first
“THE PLASTIC INTAKE MANIFOLD CRACKED AND LEAKED COOLANT ONTO THE ENGINE AND OTHER RELATED COMPONENTS. CAR DIED ON FREEWAY. THE PLASTIC INTAKE MANIFOLD CRACKS. THE COOLANT WILL LEAK ONTO THE TOP OF THE BLOCK AND THEN DOWN THE BACK OF THE ENGINE. THIS INTAKE DESIGN IS A KNOWN DEFECT BY FORD. BELOW IS AN "OWNER NOTIFICATION LETTER" FROM FORD: 97M91 APRIL, 1999 FORD MOTOR COMPANY IS PROVIDING A NO-CHARGE SERVICE PROGRAM NUMBER 97M91, TO OWNERS OF CERTAIN 1996 THROUGH 1998 CROWN VICTORIA TAXI, TOWN CAR LIMO PREP & DELIVERY PACKAGE, 1996 AND 1997 THUNDERBIRD, COUGAR AND MUSTANG VEHICLES EQUIPPED WITH 4.6L SOHC ENGINES. THIS SERVICE PROGRAM PROVIDES ADDITIONAL COVERAGE FOR THE INTAKE MANIFOLD. REASON FOR THIS PROGRAM FATIGUE CRACKS MAY DEVELOP IN SOME OF THE COMPOSITE INTAKE MANIFOLDS USED ON THE 4.6L SOHC ENGINES INSTALLED IN THE AFFECTED CARS. THIS CONDITION MAY RESULT IN ENGINE COOLANT LEAKAGE WHICH, IF NOT DETECTED OR IGNORED, WILL CAUSE ENGINE OVERHEATING. COMPLETE LOSS OF COOLANT MAY RESULT IN ENGINE DAMAGE OR ENGINE FAILURE. WHAT WE WILL DO IF THE ENGINE OF YOUR CAR SHOULD DEVELOP A COOLANT LEAK AT THE INTAKE MANIFOLD CROSS OVER COOLANT PASSAGE, LOCATED DIRECTLY…”
“WHILE DRIVING ON THE INTERSTATE AT 65MPH, THE INTAKE MANIFOLD CRACKED, SPRAYING COOLANT AND STEAM FROM THE HOT ENGINE OUT THE BACK OF THE HOOD. THIS COVERED THE WINDSHIELD, CAUSING ME TO LOSE ALL VISIBILITY. THIS IS VERY DANGEROUS, HAD THERE BEEN SOMETHING IN FRONT OF ME, I WOULD HAVE CAUSED AN ACCIDENT. I SEE THAT THERE ARE NUMEROUS RECALLS FOR THE SAME PART/ENGINE ON OTHER YEARS AND VEHICLES. THE DEALER ALSO REPLACES IT, WITH AN UPDATED VERSION TO AVOID FAILURE, AT A COST OF $900.00. IF IT IS RECALLED ON ONE CAR, WHY NOT THE REST. IT IS THE SAME PART NUMBER AND THE SAME ENGINE, IT SHOULDN'T MATTER WHAT MODEL VEHICLE IT IS IN. SOMEDAY THERE WILL BE A TERRIBLE ACCIDENT DUE TO THIS. *TR”
“I RECENTLY PURCHASED A 1999 FORD MUSTANG WITH A 1998 USED ENGINE INSTALLED INTO IT. I ONLY HAD 1 REAL PROBLEM WITH IT AND IT WAS MY EXHAUST. I HAD THAT FIXED AND RAN GREAT FOR THE NEXT DAY. LESS THEN 36 HRS AFTER THE EXHAUST WAS FIXED AND AFTER SITTING FOR ABOUT 15 HRS OR SO, WHICH WAS FROM AROUND 9:45 PM FRIDAY THE 21ST TO AROUND 12:30 TO 1:00 PM ON THE 22ND OF AUGUST. A NEIGHBOR CAME POUNDING ON OUR DOOR TELLING US OUR CAR WAS ON FIRE!!!! HE ALSO STATED THAT HE HEARD WHAT SOUNDED LIKE SOMEONE WAS TRYING TO START IT FROM A DISTANCE. WELL WE DON'T HAVE A REMOTE STARTER FOR THIS CAR, IT ONLY UNLOCKS THE CAR AND TRUNK, DOES NOT START IT. WE BELIEVE IT WAS ELECTRICAL IN NATURE AND NEED TO FIND OUT WHAT HAPPENED AS I ONLY HAD LIABILITY INS. AND NOW I HAVE LOST MY CAR AND HAVE NOTHING...... I HAVE PICTURES OF MY CAR JUST MELTING AWAY, THE ENTIRE FRONT OF IT. I LOVED THIS CAR, I WASN'T EVEN FINISHED PAYING FOR IT. I STILL OWE $1395 ON IT AND I ONLY HAD IT FOR ABOUT 7 MONTHS. FIRE MARSHALL IS STILL INVESTIGATING IT. I BELIEVE HE SAID IT POSSIBLY STARTED ON THE PASSENGER SIDE WHERE THERE WAS A BOX ABOVE THE TIRE AREA WITH WIRES IN IT. WHAT WERE THESE WIRES, WHAT WERE…”
“WE TOOK OUR 1998 6 CYLINDER MUSTANG IN FOR AN OIL CHANGE. IT HAS ABOUT 90,000 MILES ON IT. WE WERE TOLD THAT IT IS LEAKING FUEL AND THAT IT IS A SAFETY HAZARD. WE NOW HAVE TO SPEND $1000 TO REPLACE THE FUEL RAIL, BOTH VALVE GASKETS, VALVE COVER GASKETS AND FUEL INJECTOR O RINGS. PLUS A SIGNIFICANT AMOUNT ON LABOR. WE WERE TOLD THAT OUR CAR/ENGINE WILL CATCH FIRE, IF WE DO NOT REPLACE THESE PARTS. THIS IS MY DAUGHTER WHO IS IN COLLEGE'S CAR. HOW CAN THEY HAVE SUCH A HORRIBLE DESIGN AND IF WE REPLACE THE PARTS IS THIS GOING TO BE REPEATED? THE OTHER ISSUE IS THAT THERE WAS NO WARNING FROM AN ENGINE LIGHT OR ANYTHING ELSE. THE TECHNICIAN CHECKED IT BECAUSE WHEN HE LOOKED UNDER THE HOOD, HE THOUGHT HE SMELLED GAS AND THEN FOUND THE LEAK. WE HADN'T NOTICED A LEAK. MY DAUGHTER COULD HAVE BEEN KILLED DRIVING BACK TO SCHOOL THIS WEEK. *TR”
“TL*THE CONTACT OWNS A 1998 FORD MUSTANG GT. APPROXIMATELY FIFTEEN MINUTES AFTER PARKING AND EXITING THE VEHICLE, THE ENGINE COMPARTMENT BECAME ENGULFED IN FLAMES. THE VEHICLE WAS DESTROYED. THERE WAS DAMAGE TO ANOTHER VEHICLE AND TO A NEIGHBORING HOME; HOWEVER, THE CONTACT DID NOT KNOW THE EXTENT OF THE DAMAGE. A FIRE REPORT WAS FILED. THE VIN AND PURCHASE DATE WERE UNKNOWN. THE CURRENT AND FAILURE MILEAGES WERE 140,000. UPDATED 03-04-08 *BF UPDATED 03/04/08 *TR”
“SPARK PLUG SHOT OUT OF MY MUSTANG ENGINE THE DEALER SAID THEY FIXED THE PROBLEM BUT IT HAPPENED AGAIN. I PAID FOR THE REPAIRS TWICE AND THEN AGAIN FOR A 3RD TIME. IT SHOT OUT ON THE ROAD AND COULD HAVE CAUSED AN ACCIDENT. *JB”
Showing 6 of 91 reports. Read every report on NHTSA.gov.
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 11, 2026NHTSA vehicle page
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.