Other engine problem on the 1997 Mercury Cougar
When other engine problem gets reported
Owners of the 1997 Mercury Cougar report other engine problem at a median of 70,000 miles. A quarter of the reports come in before 45,000 miles and a quarter after 85,000 miles, from 9 reports that carried an odometer reading.
A part like this is normally expected to survive 95,000 miles. It is the 1st most-reported problem on this model year.
The mileage distribution
The reported range runs from 45,000 miles at the tenth percentile to 100,000 miles at the ninetieth, a spread of 56,997 miles across the middle 80% of reports.
Reports bunched into a band this tight usually mean the component has a life of its own: it goes at roughly the same mileage regardless of who owns it.
0% of the dated reports were filed under 36,000 miles.
The whole distribution
| 10th | 25th | Median | 75th | 90th |
|---|---|---|---|---|
| 44,663 miles | 45,500 miles | 70,000 miles | 86,000 miles | 101,660 miles |
Read the 10th percentile as “one report in ten arrived this early”. Exact figures are shown in this table because it is the table of record; everywhere else on the site they are rounded to the precision the sample can carry.
What a percentile can and cannot tell you here
These five numbers describe the readings owners gave, in order. The median is the middle one: half the reports arrived below it. The 10th and 90th are the edges of the bulk of the distribution, and the distance between them is the part worth reading. A tight spread — say 70,000 to 95,000 miles — points at something that wears out on a schedule, and the schedule is knowable. A wide one, 20,000 to 190,000, points at a fault that hits some cars and never troubles others, which means the mileage on the listing in front of you tells you very little about your odds.
What these figures are not is a survival curve. Every reading here comes from a car whose owner filed a complaint, so the sample contains only failures: it cannot say what share of the fleet made it past 150,000 miles untouched, because those owners had nothing to report. Nor is the mileage the moment of failure — it is the odometer reading as recalled at the time of filing, which may be weeks later and is sometimes rounded to the nearest ten thousand by the person typing it.
Percentiles are shown at all only once 8 readings exist for the vehicle and mode. Below that the middle of a handful of numbers is noise wearing a decimal point, so the figures are withheld rather than dressed up.
What happens, and what it costs
Putting it right typically runs $300–$4,000 at an independent US shop. That range is an editorial estimate held in this site's failure-mode catalogue, not a figure from NHTSA, and it is a repair cost rather than a diagnosis cost.
The same failure on other years
The same failure is reported on 6 model years of this car. It shows up earliest on the 2001, at a median of 60,000 miles, and latest on the 1999 at 95,000 miles.
By volume the 1999 carries the most reports, with 53; the 1997 has 14. A mode that appears across most years of a model is usually a design choice rather than a bad batch.
If one year stands out to the left, that is the year to avoid; if the whole line sits at a similar mileage, this is wear rather than a defect in one production run.
Tick median reported mileage Solid middle half of reports Faint 10th to 90th percentile Colour how bad the failure is when it happens
What owners wrote
Verbatim from NHTSA complaint narratives, trimmed for length. The mileage is the one the owner gave.
We have numerous complaints with this vehicle. One of which is the brakes. Another is the cooling system. There is a recall on the manifold but our local ford dealer wlll not replace even though we have asked them to do so. In addition the engine had a problem which no one could figure out.
The low coolant warninging light came on and the smell of antifreeze came into the vehicle compartment. The temperature gauge moved to the highest setting. Copious smoke escaped from under the hood of the vehicle. The forward tube of the plastic intake manifold showed a rupture about four inches long on the front of the intake manifold. Reapair cost was $1455, including replacement of the spark plugs, which had been soaked in antifreeze. The texas comission on environmental quality issued a warning to me by letter that a concerned citizen had reported my vehicle was seen emitting excessive smoke and that if I did not take action to repair the vehicle, they would charge me with a violation. The vehicle has been repaired with a new ford intake manifold that has the forward tube made out of aluminum and the rest plastic. Ford refuses to issue a recall on this model saying that human life has not been endangered. *ak
For no reason at all antifreeze started leaking from the plastic intake manifold in my 1997 cougar with a 4.6l motor. I searched the web and learned that this is a common problem and ford extended the warranty on some plastic intake manifolds. Found all info I could and copied it for the local mercury dealer to repair under warranty. Dropped it off for service, only to get a call that my VIN was not one that was awarded the extended 7 year warranty, even though the length of time we owned this cougar fit the time criteria. Im really disappointed in ford that they are not covering all of their plastic junk manifolds. I called the 800 number for complaints, but the man said I am sorry I can not help you, but I will type your info in our database. So I am no spending $900.00 to repair a car with 82k miles on it for something I would not have expected to have trouble with. To prove that they know there is a problem, they now replace the original manifold with a new part number, and design. They admit it was a bad deal, but still will not help me. I told them that while they were typing my complaint, also type that this is my last…
Also reported on the 1997 Mercury Cougar
Other wheel or tire problem
Other body or interior problem
Exhaust leak or fumes in the cabin
Overheating
Premature brake pad or rotor wear
Other powertrain problem
How far this goes
Complaints are voluntary, so 14 is a floor and not a count of affected cars. Mileages are typed in by owners and cluster on round numbers. And the mode itself is assigned by software reading the complaint text, which is reliable in bulk and fallible one report at a time.
Questions this page answers
At what mileage does other engine problem happen on the 1997 Mercury Cougar?
Across 9 owner reports that included an odometer reading, half were filed by 70,000 miles. A quarter were filed before 45,000 miles and a quarter after 85,000 miles. These are the mileages owners reported when they complained, not a prediction for any individual car.
How common is other engine problem on the 1997 Mercury Cougar?
14 reports have been filed with NHTSA, about 0.6 per 1,000 vehicles. Complaints are voluntary, so this is a floor rather than a count of affected cars.
What this is and is not. These are the mileages at which owners chose to complain to a federal agency, which is not the same as the mileage at which the part fails on every car. It skews toward failures that happened outside warranty, cost real money, or frightened someone. It is still the only public dataset that carries failure mileage at all, and the shape of a few hundred readings is informative even when a single one is not. Methodology · JSON · this failure on other cars
Source Owner complaints and recall records published by the US National Highway Traffic Safety Administration, model years 1996–2027 Figures rebuilt Published by AtWhatMileage How every figure is computed