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Cadillac Forum: HT4100 4.1, 4.5, 4.9

This forum is to discuss the newer aluminum block Cadillac engines.

  1. Sticky Thread Sticky: OBD I codes for 4.x Engines

    To retrieve the codes, Turn the ignition on. Press both OFF and WARMER on the climate control at the same time until the segment check displays. The codes will now be displayed. When the codes are...

    Started by DaveSmed‎, 09-20-04 01:50 AM
    • Replies: 0
    • Views: 56,346
    09-20-04, 01:50 AM Go to last post
  1. Question Proper Engine Break In Reman 4.1

    well got my long block today as seen in my other post i must say looks sweet got 3 gals of mobil delvac super 1300 and my bars golden seal powder going to grab a quart of eos at the gm dealer and...

    Started by tacoma‎, 06-05-04 07:04 AM
    • Replies: 6
    • Views: 863
    06-08-04, 05:50 AM Go to last post
  2. '94 4.9 won't start!

    My '94 Deville wouldn't start this morning. The starter solenoid clicked, but that was it. This happened once before when I first got it, but I though the battery was just low, and I jump started...

    Started by caddydaddy‎, 06-07-04 08:14 AM
    • Replies: 3
    • Views: 627
    06-07-04, 06:05 PM Go to last post
  3. 4.1 Saddened

    I enherited a 82 Fleetwood Broughm De' Elegance with a HT 4100 in it. I drove it on ocassion as a teen and it ran great. Now, it is mine because my Dad died. It was in perfect shape when my Mom gave...

    Started by 5kjunk‎, 06-03-04 10:12 PM
    • Replies: 2
    • Views: 688
    06-07-04, 11:00 AM Go to last post
  4. 1990 SDV tranny- Please help

    My 90 SDV tranny just started "slip" when I start off from a stop. 1 second of vibration and then it goes fine. Once I'm going 4 or 5 mph I can stomp on it and no problem. Local caddy dealer says the...

    Started by Cliffy‎, 05-21-04 03:53 PM
    • Replies: 7
    • Views: 674
    06-07-04, 05:18 AM Go to last post
  5. 4T60E slipping

    This is my first posting here. I'm in need of some help. My 1993 Sedan DeVille started slipping while in gear. It only occurs while taking off from a stop. It takes some time to get up to speed but...

    Started by pderk‎, 06-05-04 10:28 AM
    • Replies: 1
    • Views: 1,232
    06-05-04, 04:00 PM Go to last post
  6. Need second opinion 4.1 swap to northstar

    Hello I have an 87 eldorado 4.1. I want to put northstar engine in. I have access to complete northstar and tranny, with wire harness and and computer. Will this work? I am not afraid of custom...

    Started by Julz87Eldo‎, 06-02-04 07:40 PM
    • Replies: 6
    • Views: 949
    06-05-04, 03:47 PM Go to last post
  7. Cadillac Coral?

    Im posting this in here just cuz I think the car I saw has a 4.5 Near my g/f's house theres an old couple that owns 2 caddies. One is beaten to hell and the other they still drive. It appears to...

    Started by chuckdobbins‎, 06-04-04 09:48 PM
    • Replies: 3
    • Views: 477
    06-04-04, 11:40 PM Go to last post
  8. OMG..Maybe it is the water pump. THIS IS ANNOYING.

    Replaced the Idler this morning and it cost me $20 not too bad. Put the belt back on and started it and waaalaaa...same horrible noise. The idler did need replacing but now this is getting on my...

    Started by Msilva954‎, 05-31-04 11:46 AM
    • Replies: 10
    • Views: 763
    06-04-04, 08:40 PM Go to last post
  9. Marked surge at light throttle

    In attempts to get my EGR system to function, I have replaced ALL vacuum hoses under the hood. Now experience strong surging between 25 & 45 mph most marked as the engine is warming up (54 to 68...

    Started by bigred‎, 06-04-04 01:44 PM
    • Replies: 0
    • Views: 401
    06-04-04, 01:44 PM Go to last post
  10. 95 deville 4.9 miss at idle

    I have a 95 4.9 I have replaced egr, plugs, wires, cap,rotor, and clead egr ports I still have a slight miss and ping. this motor has 84000 miles and has always been serviced and never beat. I need...

    Started by rcad74‎, 06-03-04 07:00 PM
    • Replies: 4
    • Views: 1,004
    06-04-04, 09:15 AM Go to last post
  11. 92 4.9L Engine Reassembly - my heads are off and engine is in car.

    Still broke down in Coffee Springs, AL - Delightful place for a breakdown. Fantastic fishing here! Warm hospitable folks. Nice weather. The preacher sunday looked at my sandals a bit funny ......

    Started by 92deville-loveit‎, 05-06-04 05:37 PM
    • Replies: 12
    • Views: 1,780
    06-04-04, 08:10 AM Go to last post
  12. Talking newbie

    Hey guys and gals im new here and i have a question i own/drive a 1989 cadillac eldorado with mods ive done myself and i happen to have a cracked rear(right) manifold and i was wondering what car...

    Started by CadillacCowboy‎, 06-03-04 06:04 PM
    • Replies: 1
    • Views: 414
    06-03-04, 10:51 PM Go to last post
  13. 88 4.5 Coupe Deville

    I could use some help.... I'm trying to check the service codes for the car, but when I've used the instructions linked here they only seem to work as far as entring the system. Can anyone...

    Started by macutty‎, 03-28-04 06:49 PM
    • Replies: 5
    • Views: 903
    06-03-04, 10:23 PM Go to last post
  14. Thumbs up Bars Golden Seal Powder Stop Leak And Other Stuff (Deals?)

    I thought a thread on some of the required goodies would be nice this seems like a mild deal thought id post it :) :) :) Bars Golden Seal Powder Stop Leak 17.88 + Shipping

    Started by tacoma‎, 06-03-04 06:12 AM
    • Replies: 2
    • Views: 1,905
    06-03-04, 07:36 PM Go to last post
  15. Took off the belt and its not the waterpump making noise..need help

    So much for listening to the dealer...I finally made out their invoice and Idler is in it....I think they added the waterpump in there just to make a quick $455. I took the belt off and they all...

    Started by Msilva954‎, 05-30-04 07:42 PM
    • Replies: 7
    • Views: 707
    06-03-04, 06:59 AM Go to last post
  16. Is my 4.9 on the way out?

    Here's the scenario: She's dropping coolant every 2 weeks from the reservior. Checked all hoses and lines, bone dry. Sometimes she'll misfire, but rarely. Do I have what appears to be a head...

    Started by 2dfx‎, 06-01-04 11:33 PM
    • Replies: 4
    • Views: 808
    06-03-04, 12:13 AM Go to last post
  17. gonna replace the 4100 on 83 cadillac deville would it be possible to put a chevy 350

    I just bought an 83 cadillac deville I'm looking to replace the 4100 engine cause I heard they were bad engines. Would a rebuilt 350 chevy engine be possible to drop in, if not what would be my best...

    Started by cjd060‎, 06-02-04 03:48 AM
    • Replies: 1
    • Views: 996
    06-02-04, 11:30 PM Go to last post
  18. Exclamation Car make caveman brain hurt

    I need help with a problem i get every once in a while. The car will hesitate some times. there are no noticable causes to set it off. one code keeps returning E38 open MAT senser circuit but not...

    Started by Caveman‎, 05-20-04 10:22 PM
    • Replies: 14
    • Views: 825
    06-02-04, 12:33 PM Go to last post
  19. can the 4.5 handle and 50-75 shot of nitrous

    I was watching horse power tv on spike tv last night and they put a NOS universal dry kit into a civic. Looked fairly easy and it just mounts the jet in the intake tube. So that got me thinking about...

    Started by DeVillish‎, 05-31-04 08:22 AM
    • Replies: 5
    • Views: 650
    06-02-04, 02:27 AM Go to last post
  20. Question E-030 + Poor Mileage + Bouncing High Idle At Startup

    :bonkers: In the continuing saga of The Car Problems... I had an opportunity to take it from under 20mph to WOT FOUR TIMES today... NOTES: 1st time: __Whatever gear it was in when I began, that...

    Started by Susana‎, 06-01-04 01:05 AM
    • Replies: 1
    • Views: 1,300
    06-01-04, 05:54 PM Go to last post
  21. What should I do if I put too much bars leak in?

    I had coolant leaking all over the top of my engine, and couldn't find the cause, so I was rash, went out and bought 2 more things of bars leak powder, and added them to the cooling system. This...

    Started by CatagoryV‎, 06-01-04 02:39 PM
    • Replies: 1
    • Views: 934
    06-01-04, 04:28 PM Go to last post
  22. Waterpump Replacement

    My roommate has a 82 Cadillac. Last night the waterpump went out and he got the pump out, but is unable to get the center bolt off the pulley. He wants to know if the center hex bolt on the pulley...

    Started by ChevyTrkLvr‎, 05-30-04 09:44 AM
    • Replies: 3
    • Views: 707
    06-01-04, 01:02 AM Go to last post
  23. OH-NO!! The dreaded 4.1 "knocking".

    I have a BEAUTIFUL 1985 Seville. Everything works and the car is a dream to drive. I bought it from an older (older than me) guy who really pampered it. He used it only for the 2-3 annual trips to...

    Started by qwerty111‎, 05-19-04 12:44 AM
    • Replies: 5
    • Views: 966
    06-01-04, 12:12 AM Go to last post
  24. Changed coolant without pellets; what to do??

    I just had to replace my radiator and had the coolant flushed and re-filled. I dont believe the shop put the pellets in (I just remembered it), so is it too late to put them in now? Im concerned...

    Started by RAMAIR57‎, 05-27-04 05:12 PM
    • Replies: 5
    • Views: 886
    05-31-04, 02:20 AM Go to last post
  25. tps................. help!

    What's up guys? I need to know how you can tell if your tps is bad or is going bad. What signs and/or symptoms will it give you. Also what would the idle speed control servo do to show you...

    Started by green Deville‎, 05-30-04 09:58 PM
    • Replies: 1
    • Views: 604
    05-31-04, 02:04 AM Go to last post

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