1991 Ford Thunderbird Problems

What owners report

Owners of this model year most often describe engine head gasket failures on the 3.8L V6, usually showing up as overheating, white smoke and coolant loss, sometimes followed by lower-end engine damage. Brake complaints — a pedal that goes to the floor, warning lights, loss of assist — and throttle linkage or speed control problems that leave the engine stuck at high RPM are the other recurring themes, alongside windshield wiper and headlight faults.

1. 1
   Engine cooling

   Head gasket failure and overheating (3.8L V6)

   • 13 complaints (12%)
   • median 80,250 mi at 12.7 yrs old (2 state mileage, few)
   • filed 1999–2004

   Complaints describe the engine overheating, white smoke from the exhaust, coolant loss and coolant reaching the exhaust, traced by dealers and shops to failed head gaskets. Several owners say the repair was done at their own expense, and some report repeat failures or lower-end engine damage such as rod bearing or crankshaft problems after the gasket work. A few mention the dealer declining to cover the repair. Reported across a wide mileage spread in the sample, from roughly 15,000 to about 90,000 miles, often with no warning beforehand.

   What to check: Look for coolant residue, white exhaust smoke, a sweet smell or an unexplained coolant level drop, and ask for head gasket service records. A compression or coolant-pressure test before purchase can help.

   2 excerpts from owner complaints in NHTSA records

   “I am in a club of over 5,000 owners of identical cars and failures have been seen as low as 18,000 miles to my knowledge, and numerous in the 60000 mile range on well maintained cars of headgasket failure which often causes complete engine failure, in my case it caused two connecting rods to fail, a crankshaft bearing due to oil contamination and the crankshaft as a result. …”

   NHTSA complaint #758776, filed 2002-02

   “Head gasket premature failure. Bay Ford replaced head gasket 2 1/2 months and 3,000 miles after we purchased this well maintained used vehicle for over blue book price. The dealer failed to tell us what we now know to be true - all fords with 3.8l engines with the aluminum heads are suffering from this problem, often leading to engine failure and large bills which Ford is not recognizing with their very limited extended warranty. …”

   NHTSA complaint #720938, filed 2000-04
2. 2
   Brakes

   Brake pedal to the floor / loss of brake assist

   • 22 complaints (20%)
   • median 159,754 mi at 17.8 yrs old (2 state mileage, few)
   • 3 mention a crash, fire or injury
   • filed 1995–2015

   Complaints describe the brake pedal sinking to the floor with little resistance, brake and ABS warning lights coming on, and intermittent loss of braking while driving. Some owners report a hard pedal and loss of hydraulic assist, with troubleshooting pointing to the brake pressure switch or accumulator; others were told a diagnostic showed no fault. Reported from low mileage up to about 175,000 miles, at speeds from around 15 mph to highway speeds.

   What to check: Ask about brake and ABS warning lights, master cylinder or accumulator replacement, and any history of a spongy or low pedal. Test the pedal on a safe stop and check the ABS light at start-up.

   2 excerpts from owner complaints in NHTSA records

   “I was on my way to work when the truck in front of me stopped in front of me to let a car in our lane. We were going around 15 MPH. When I stepped on the brake, I just kept on going and hit the truck in the rear. I put the car in park and got out and went over to the driver of the truck to make sure he was ok. He told me he was fine,at which point I told him the damage done was to my car and his truck was fine. He said fine and went on his way. I got back in my car and found my brake peddle had broken off the arm and was on the floor. …”

   NHTSA complaint #710522, filed 1999-08

   “Loss of hydraulic brake assist on super coupe. Pedal became hard to press. Both brake and ABS annunciators illuminating. Troubleshooting indicates brake pressure switch failing to signal pump to charge system or accumulator has failed. Master cylinder and ABS system are original equipment and thus 24 years old.”

   NHTSA complaint #10724856, filed 2015-06, 175,000 miles
3. 3
   Vehicle speed control

   Throttle sticking or unintended high engine speed

   • 7 complaints (6%)
   • median 144,509 mi at 11.0 yrs old (1 states mileage, few)
   • 2 mention a crash, fire or injury
   • filed 1995–2005

   Owners report the accelerator or throttle linkage sticking, sometimes wide open, with the vehicle continuing to accelerate until the ignition was switched off or the pedal was freed. Several complaints trace it to a broken or disintegrated plastic bushing or a small linkage part on the throttle cable, and some describe brake or transmission work afterward. Mostly reported on vehicles well past 100,000 miles in the sample, and in a few cases with no mileage given.

   What to check: Inspect the throttle cable and its plastic bushings for cracking or play, and check that the pedal and linkage return freely. Ask whether the throttle linkage has been serviced.

   2 excerpts from owner complaints in NHTSA records

   “Vehicle rapidly accelerated on its own as we were leaving a rest stop, and we were forced to ultimately turn off the ignition before it could be brought to a stop. Speeds exceeded 100 MPH - brakes were applied, and were heated to the point that one of the front struts actually blew out . …”

   NHTSA complaint #703600, filed 1999-02

   “While the consumer was driving on the highway the accelerator became struck. As a result the vehicle continued to accelerate until the brake pedal and emergency brake were applied.”

   NHTSA complaint #896923, filed 2005-08, 144,509 miles
4. 4
   Exterior lighting

   Headlights flickering or cutting out

   • 8 complaints (7%)
   • median 90,000 mi at 12.1 yrs old (2 state mileage, few)
   • filed 1996–2004

   Owners report headlights blinking on and off after being on for a while, sometimes going out completely, and a headlamp circuit breaker or headlight switch being replaced. Some complaints note similar problems on later models that were covered by a headlamp recall, while this vehicle was not included. Described after 20-30 minutes of headlight use; reported at low mileage and by owners without recorded mileage.

   What to check: With the headlights on for a sustained period, check for flicker or dropout, and ask whether the headlamp switch or circuit breaker has been replaced.

   2 excerpts from owner complaints in NHTSA records

   “Headlights flicker at night, making it very hard to see. Consumer is having the same problem as discussed in a manufacturer's recall concerning headlamp switch. However, this vehicle is not included. The head light switch had been replaced twice. The consumer had encountered close calls due to head light failures and indicated the conditon to be dangerous.”

   NHTSA complaint #862951, filed 2000-06

   “Consumer has experienced problem with intermittent brake failure. When brakes applied vehicle would keep on going. Also, intermittently park lights and ABS lights would come on, and all brakes would fail to stop vehicle. Dealer notified.”

   NHTSA complaint #827831, filed 1998-09

Buying note. This model year is old enough that condition matters more than any single fault: coolant and head gasket history, brake system service and free throttle linkage are the things worth verifying. Ask for repair records and treat a car with no documentation as needing a full inspection.

Summary written with AI from a sample of 52 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.