1982 Cadillac DeVille Coupe from North America - Comments

HT4100 Owners, check out the new HT4100 Owner's Club -- www.ht4100.com, and our Yahoo! groups mailing list on the Links page there.

I have the ht4100 in my 82 coupe deville, and that thing is smoking like a mother. But I love the car, and I plan on rebuilding the engine. You just can't beat the way, the caddy floats down the highway. And theres plenty of room in the back seat, for you and the ladies,!!! HA HA.

For all you owners of RWD Cadillacs afflicted with an ailing 4100HT have you looked into swapping in an Olds 403 or other GM V-8? It should bolt up to your transmission as would a Buick or Pontiac as they all shared the same bellhousing pattern. You might even get lucky and have a 200-4R overdrive or TH350 with the dual pattern bellhousing that would allow a Chevy engine swap without changing transmissions.

Personally, I'm swapping a Cadillac 4.9 into a Lumina. :o)

I'm a proud owner of 1983 coupe with the ht 4100. I've never had any drastic problems with my Lac. Just keep it up to speed, change the oil,anti freeze spark plugs all filters, and check your vacume hoses that's important in this 4100, because if one hose is cracked or broke you'll lack power. Ways to boost it>a high octane boost+top shelf wires and plugs will enhance your acceleration. I bought mine with 74,000 miles for 1,600 dollars. I added a Rolls Royce grille which I found at the junk yard and paid only $25.00 for it! I put 15 inch gold and chrome 100 spoke rims with the 2 inch fat white wall>$800.00. I also spend a lot of time looking for parts in the junk yard, like chrome add ons. Now people stop me on the road once a week asking if me I want to sell my ride. I was offered 5,000 for it yesterday, but I can't part with my baby.

I too have an 1983 sedan de ville with the ht4100. my car has 92,000 miles and I have a cylinder that has low compression. I am going to tear it down and see just what the problem is. I bought the car 3 yrs. ago this past august with 58k miles on it. it has been very reliable and has been good as far as economy goes. one of the problems is that I can see that some of the previous repairs such as valve cover gaskets we're not done correctly. rtv does not last very long. I only paid 2900.00 for the car and haven't put too much money in it. I may have to now with the bad cylinder. of course it depends on what else is wrong with it. I've used the coolant tabs ever since I bought the car and to my knowledge there is no coolant leaking. my question to any other caddy owners out there is would an olds 307 engine fit in my 1983 sedan de ville and if so how much work would it be to change it over. I'm pretty sure the 1985 and up broughams used the olds 307. any replies would be appreciated.

I have an 82 sedan DeVille and I'm replaceing the alternator in it. There is nothing wrong besides a little interior work. I pretty much stole this car, I got it for $150. The guy brought it over with a full tank of gas. (That I drove on for a whole week.) I have the ht4100 in it. I just degreased the engine a week ago and haven't drove it yet. But as soon as this alternator goes on ill have the big body dippin from here to H-Town. If you need help with your 82 sedan deville hit me up. I keep my car in perfect condition. bigzig84@yahoo.com.

I don't know about anyone else, but I had a 1987 Brougham, 60,000 miles on it with the Olds 307 in it and I will never again buy one with this engine. It was extremely underpowered and unreliable. But the car was red and in mint condition and regret selling it.

My son just bought an '82 Deville. I wish I had checked this site before now that it seems the 4100 engine is so trouble prone. His was replaced a few years ago. It runs quietly and smoothly, it seems like it has more than 125 h.p., but there is a ping or knock at times. We really need to get an owner's manual as I we don't even know the fuel requirements for this car. It's not registered yet so we have some time to do some research.

Well I got a 1985 caddi fleetwood-brougham and it is powered by the ht 4100. she had original 57,000 miles when I got her, but she just doesn't have the get up and go I need. I am a young guy with a very heavy foot. when I first got her I could get in and power lock her and make it set the tires a fire, but now she runs sluggish and smokes when she is ran hard while idling at the lights or stop sign... is there any other engine that will go in wit out changing a lot of stuff?

I have an 87 Fleetwood D'Elegance with 225,000 miles on it. The tranny only has 19,000. However unfortunately it does have the HT4100 which was rebuilt somewhere in the 150,000's, but now it sucks down coolant and the oil smells like coolant and the area where the block meets the head is soaked. The car is horribly underpowered and the engine has rod knock when it heats up. The HT4100 was horrible, you can change the oil and the coolant all you want you'll just be wasting your time.

I have an 1985 fleetwood just wondering what engines are compatible with the 4100 please give any info you can.

After reading all of your comments, I'm kinda on the middle of the fence here. You see, I've been offered a 1982 Cadillac Coupe De Ville. Would you all advise to go for it, or just walk away now. If it makes any difference in your opinions, I live in Canada eh! So if you think our weather might effect the engine, please do say.

Okae??

I own a 1982 Coupe Deville with the HT-4100. I've put 6k miles on it since I bought it three years ago (sat for 2.5 years), and it now has 110k miles. There is a slight knocking sound in the engine that can be heard more easily from under the car. I've been told it can be various different things. I was advised by a Mobil gas station service center not to purchase the car based on this knock. I bought it anyway (for $1,700) and it has been running great. All I read online is horrible stuff about this engine, and it scares me, but I drive it very easily, with a light foot, using the weight of the car to guide me along more than the gas pedal... and it's been an awesome car for me. Yeah, it's underpowered, but it rides so smooth and gives me all the leg and head room a 6'3" guy needs. I plan to find a late eighties Deville or Brougham once I get the money, any suggestions/comments about the 5.0 or 5.7 engines in these models?

I have a 1983 Cadillac Sedan DeVille with 89,000 on it. It was making a popping noise like a valve wasn't opening or closing, so I replaced the timing chain. It sounds a lot better than it did. I need to know if anyone had this problem out of their ht 4100 motor.

I purchased the car at 38.000 miles, never experienced any oil leaks or ran hot or coolant mixing with oil.

I owned the car for 12 years (one owner). I was thinking about changing or rebuilding the heads & new camshaft. What other motor is compatible with this car without changing a lot of components such as computer transmission etc?

The only parts I ever changed on this car are the waterpump, alternator and radiator. Everything else is original. It's RWD, big body, fuel injection.

Email hwilli3@twcny.rr.com for any good suggestions.