1984 Cadillac DeVille Coupe from North America - Comments

Thermostat failed, causing engine to overheat.

Vehicle's main computer failed.

Digital climate controls failed.

Transmission failed.

Timing chain broke.

Engine started burning oil.

I am really surprised to hear so many good reviews on the 1984 Cadillac Coupe DeVille.

Unfortunately, mine was a different story long toward the end. I bought the car used in 1988 with 30,000 miles on it. I loved it, it was big, roomy, comfortable, smooth and quiet. The HT4100 wasn't a powerhouse, but it got the car up to speed pretty good.

I took the family to Florida to see Mickey in it in 1989, which was a 1,400 mile round trip. The car got us there and back with no problems.

In 1991, the thermostat failed and the car overheated in bumper to bumper traffic one afternoon. Thermostats are considered routine maintenance, so no big deal.

When hurricane Andrew was headed for Louisiana in 1992, we loaded up the Caddy and drove 800 miles North to stay with relatives. Again, car purred like a kitten there and back with no problems. I also made frequent road trips to Lafayette, Louisiana from New Orleans which was a 250 mile round trip. I never encountered a problem on any of the trips.

In 1993, I moved the family to Orlando, Florida from New Orleans. I drove the moving truck while the wife and kids rode in the Cadillac. 650 miles was covered without incident. I believe the car had somewhere in the neighborhood of about 120,000 miles by this time and was 9 years old. It continued to run reliably for the remainder of the year, but by 1994...it was beginning to get old really fast.

First, the computer failed and Massey Cadillac charged us a bloody fortune for a new one! I was hesitant to have the car repaired, but I believed that it would give us at least another several years of trouble-free service.

Next was the digital climate control. Massey wanted an arm and a leg to repair, so we had it rigged by a shade-tree mechanic. The car was 10 years old, so we figured what the heck. The operation of the climate controls required the use of a 'toggle' switch, but worked nonetheless.

One night while we were cruising home from Wal-Mart at about 45-50 mph, the transmission dropped it's gears. If you can imagine, this caused quite a jolt. At first we thought someone had rear-ended us! Thankfully, the car would still move, but wouldn't shift out of first. We 'limped' the rest of the way home in 1st gear. New transmission cost us $1500 for a re-manufactured unit. AAMCO replaced it. They explained to us that it looked as though an engine bushing had been lodged through it. I'm an idiot when it comes to automatic transmissions, so I accepted this. The car never really drove the same with the 'new' transmission. It had no get-up-and-go anymore. It almost felt as though the car was starting off in 2nd gear.

I decided to bring it back to AAMCO, and on my way there the darn thing broke down on me!

The engine stalled as I was coasting down the road. I pulled it off to the side and tried to crank it. The engine would crank, but wouldn't turn over. Rats! AAA came out and towed it to the local repair shop. Turned out to be the darn timing chain! The car had 136,000 miles. I decided I'd get the car fixed this one last time and then either sell it or trade it in for a better car.

I wound up driving the Cadillac for another year or so. I never even bothered to bring it back to AAMCO. Instead, I decided to live with it.

Everything held up mechanically, but it wasn't long before the interior started falling apart. The headliner was hanging down, the windows were falling off their tracks, the plastic wood panelings were coming unglued and falling off, the fuel gage (located in the top-center of the dash) had a mind of it's own and of course the cassette player began eating tapes until it finally quit.

The final straw was in 1995 when the engine started burning a significant amount of oil out of the tail-pipe. I told my wife we're taking the car down and we're unloading it! I promised her a newer car, so she agreed for us to let 'blue boy' go.

We lost the driver's side hub cap on our way to the dealership. We arrived at the dealership and worked out a good deal on a 1992 Coupe DeVille (white with white/burgundy leather interior) Although they didn't give us much for the 84, I was glad to see it go!

The 92 had only 25,000 miles. I drove that car until 2002 and sold it with 180,000 miles. In my humble opinion, the 92 aged much more gracefully than the 84...and I didn't half as much trouble with it. The only 'major' item I replaced on the 92 was a starter at 150,000 miles. Everything else worked like a charm. The 4.9 V8 could run circles around the 4.1.

Well, that's my story!

Sorry to hear about all the troubles you’re having with the 84 Deville.

My Brother and his wife have an 84 Deville and are in the same boat right now. The 84 Deville with the 4.1 engine needs a LOT of maintenance as outlined in your Owners Manual. Especially as it hit’s the higher end of the mileage range and things start to get old. Although the dealer should advise you at each service visit of what’s due, they may miss something OR the cost of the service may make you think twice about having it done. However, make no mistake, an old Cadillac is as costly to own as a NEW Cadillac and from my experience, when it rains, it pores in Cadillac land.

I am on my 3rd Cadillac and I have invested in maintenance alone, well over 150k all in all.

I have a 1983 cadillac coupe divlle this car runs great to hear people say the car is junk,that's is rubbish what do you expect out of a old cadillac or any car in general the problems this guy said was wrong with his car happens with any car with a lot of miles it, s called routine maintance and maybe the newer coupe didn, t have as many problem, s because of newer technology. I think the older one looks better anyway by michael in folsom CA,

Sorry to hear of all the problems you had with your car. I have an 83 Coupe deVille with 39k miles on it. I LOVE this car.

Cadillac is a life style. I had a 90 Eldorado Biarritz, a 98 Catera, and the 83 Coupe deVille. They require a LOT of upkeep and money. That just comes with owning a Cadillac. That is why elderly people make such great Cadillac owners as they tend to have all the time in the world to keep these touchy cars in order.

On my 83, I have the LOF done every 2k miles, the coolant changed and pellets added every year. I have NEVER had any of the issues with the 4.1 that have been reported.

Ahh, Massey Cadillac. They are a pretty good dealer, but I have found them to be rather doom and gloom, and the like to suggest repairs seemingly out of nowhere.

You gave a very good review of your car. Even though you had trouble with the car at the end, it did very well for an 84. The rear wheel drive Caddys with the HT4100 engine were geared for high RPM;3.42:1. That explains why the transmission dropped it's gears and why the timing chain broke.

1983 Cadillac Deville 4100 E.D.Fuel Injection. I paid $500.00 clams for the car in June 2008 and drove it for 2 months with no problem including trips over back road gravel. Then it quit on me for about 1/2 hr. Crank but not run. It fired up and I drove 60 miles to a garage. A fuse and fuel filter and off I went to stall in a major intersection... tow truck to garage. Off I went again with no problem that could be found... broke down in a medium intersection at rush hour and had it towed back. Put a new Coil (Modulator) and drove for 300 miles and a week before I went over some railway tracks and low and behold it quit again. Crank but no run. So I took the panel off to get at the fuses and am checking them. A key orange wire with a black stripe was hanging off, and I may have dislodged it pulling fuses. The fuel pump is in the tank and it could be a ground problem or wiring in the tank. Never the less I am finished with this magnificant car... terrific ride when it runs, but after quitting 4 times without a solution I have had it. It has 94,000 originalkm and one owner. No rust, Interior as new... actually without this problem and $300.00 of body work to clean up the scraps it would be close to excellent. I have never had a car that could not be fixed without methodically replacing a lot of parts to remedy the problem. Luck, CF Canada.