29th Apr 2009, 22:16

I have a 1984 Deville with a 4100 engine! This car can't get out of its own way! Please advise what is the biggest motor with max horsepower that will fit into this car with the least amount of hassle! Willing to replace full drive train if that is what is needed to get the job done,and make this a "Sleeper"!

Thanks all!

1st May 2009, 06:53

To the guy looking for a motor swap... you could go with a carburated 350, or if you wanted to get stupid go with a 472 like in the 70's. I would take some modifying, but it would be cool (no fuel economy though LOL) If it were me though, I'd go with a carb-ed 350 with a turbo 350 transmission. In a coup, that should get er done.

19th May 2009, 11:25

Last year I bought a 82 Cadillac Coupe Deville. It was a 350 diesel, and now it is a gasoline engine. I don't know what engine it is. Could some one help me out. Please.

19th May 2009, 14:47

I may be mistaken, so don't bash me too hard if I am wrong guys and gals, but I believe if you have fuel injection it's a 350 and if it's a carburetor it's a 4100 or a 305 cid. Like I said I could be wrong but I know that's how it is for later years 89-92 sorry if I am wrong,snd i hope this helps.

13th Dec 2009, 22:28

So far I have had some rather wishy washy luck.

You all say that it is a rather small motor for the size of car, imagine how that ratio changes when it is a hearse!

I have had to replace my alternator, fuel pump and ECM chip (due to a short that was caused by an idiot who I bought it from).

The usual maintenance, spark plugs, wires, radiator flush, and oil change has been performed on my ride.

It doesn't like the cold much. It doesn't want to run very good for the first few minutes but if you press the gas lightly and let it run a little bit all is fine.

My muffler has rusted out and is now sitting in the back of my car. The catalytic converter is also rusted out. Eventually a new exhaust system will be installed and hopefully with dual exhaust.

My hearse has 78,000 or so miles on it and the replacements have been the only problem as of now.

This car loves to cruise anywhere from 45 to 65 smoothly. Has some problems getting up to speeds.

It still shifts good at 35 and 50 mph.

So far so good, and hopefully it stays like that for a little while.

9th Jan 2010, 01:16

I got my 1982 Coupe Deville back in "05". It was a trade in on a new car. The old lady was the original owner, and she couldn't maneuver it like she use to. It was love at first sight! I couldn't believe my eyes. My dream has come true! It had 83,000 original miles and everything worked perfect. White with tan fabric interior with a corduroy pattern. "Sweet"! Flawless and the carpet is like new. Then I looked under the hood to see what she was ruining with because the fender emblems were missing. "Low and behold" the famous HT 4100 in all of it's glory! Never tampered with, all systems functioning perfectly.

I live in Vegas and in the summer it's 115 on a cool day! I drive it all the time in the middle of summer all day long cruising the strip! Never cutting the engine off for hours at a time! Stuck in the Las Vegas Strip traffic for hours! I NEVER HAD ANY PROBLEMS WITH THIS ENGINE!!! I'm still rollin at least three times this week already in 2010!

So to all of you HT 4100 haters; "Don't judge a book by its reputation, READ IT YOURSELF!!!

16th Apr 2010, 11:12

I just got a 82 Cadillacs DeVille with a Hearse conversion. It has the small (under powered) V8 with 82K miles.

I would like to place a rebuilt engine in it... but can't find one. What other size/type do you suggest?

furby@hauntepugetsound.com

Thanks.

26th May 2010, 16:53

To the poster who said that if it is fuel injected, it's a 350, and if carbureted, a 4100 or 307 -- Not so.

The 1982 HT4100 was the first year of "DFI" or Digital Fuel Injection. It was computer controlled and IIRC, had a throttle body similar to a carburetor with two injectors in it.

The '80-'81 models had an EFI set-up.

3rd Jun 2010, 02:14

I have an 82 Deville that just died twice. Thought it was catalytic converter as it was burning hot, so it took off, no go. Then noticed injector spewing fuel. Cleaned and then ran good for about 5 miles, then quit again. Now won't start and flooding enough that it is running out of exhaust. I heard that maybe heat sensor?? Any help? Thanks.

28th Jan 2012, 13:49

I've had an 83 Sedan DeVille since 98 I think it was. Got it at an auction in Tulsa after someone stole my Fiat. I was the third owner I think. It had been abused by the second owner, and the car was repossessed and auctioned. Looked nice.

That engine lasted until 200K. I put a junkyard 4.1 in to replace it, and it's been fine for 160K. I put a rebuilt transmission in 10K miles after the second engine went in.

It's critical to use coolant sealer with these engines. I've used AlumaSeal all the way.

I'm getting ready to sell it as it looks like hell, and people think I'm a homeless person when they see it. Sure has been a wonderful car.