HT4100 4.1, 4.5, 4.9
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HT4100 4.1, 4.5, 4.9 in Cadillac forums : Cadillac Owners Forum, This forum is to discuss the newer aluminum block Cadillac engines.
  1. Sticky Thread Sticky: OBD I codes for 4.x Engines

    Started by DaveSmed‎, 09-20-04 02:50 AM
    • Replies: 0
    • Views: 57,763
    09-20-04, 02:50 AM Go to last post
  1. Changed Plugs/Wires - then I got three codes...

    Started by lochenjons‎, 01-23-17 08:29 PM
    • Replies: 5
    • Views: 135
    02-03-17, 05:37 PM Go to last post
  2. 4.9 mystery issue....

    Started by abrasumente‎, 11-16-16 10:04 PM
    • Replies: 3
    • Views: 250
    01-25-17, 02:22 AM Go to last post
  3. Injectors solved the miss BUT fuel rail leaks bad

    Started by rafe‎, 01-13-17 08:52 PM
    • Replies: 1
    • Views: 115
    01-15-17, 03:21 PM Go to last post
  4. 4100 sleeve selection (rehash?)

    Started by Leeb‎, 06-15-05 08:01 AM
    4 Pages
    1 2 3 4
    • Replies: 48
    • Views: 4,503
    01-12-17, 09:23 AM Go to last post
  5. Looking For More Power From My 4.1

    Started by CaddyFromNowOn‎, 02-05-06 02:13 PM
    • Replies: 14
    • Views: 1,073
    01-12-17, 09:14 AM Go to last post
  6. Coolant pellets/conditoner

    Started by MARK2995‎, 10-06-05 09:09 PM
    • Replies: 4
    • Views: 696
    01-12-17, 09:09 AM Go to last post
  7. HT4100 4.1, need help finding this part!

    Started by spitfire980‎, 10-30-16 02:43 AM
    • Replies: 4
    • Views: 257
    01-09-17, 12:51 AM Go to last post
  8. HT 4100 Engine is it that bad

    Started by thewill02‎, 04-23-04 01:07 PM
    3 Pages
    1 2 3
    • Replies: 36
    • Views: 6,017
    12-18-16, 02:37 PM Go to last post
  9. My 1986 Coupe De Ville 4.1L startup

    Started by tallpat‎, 12-18-16 07:20 AM
    • Replies: 0
    • Views: 99
    12-18-16, 07:20 AM Go to last post
  10. Where is the MAP sensor located ???? 84 Seville

    Started by HoganRadial‎, 11-26-05 04:33 PM
    • Replies: 3
    • Views: 2,113
    12-10-16, 04:26 PM Go to last post
  11. Diesel Oil For 4.9?

    Started by WastedBugsBunny‎, 11-29-16 02:36 PM
    • Replies: 8
    • Views: 188
    12-01-16, 09:05 PM Go to last post
  12. Looking for a Great Mechanic in Los Angeles, CA.

    Started by CornerMan‎, 11-04-16 04:00 PM
    • Replies: 1
    • Views: 102
    11-04-16, 07:19 PM Go to last post
  13. Need Help in OKLAHOMA CITY

    Started by MSully‎, 10-27-16 07:02 PM
    • Replies: 1
    • Views: 171
    10-30-16, 11:25 AM Go to last post
  14. Your experience with the HT 4100?

    Started by 85SevilleFan‎, 07-28-16 04:09 PM
    • Replies: 8
    • Views: 487
    10-26-16, 05:33 PM Go to last post
  15. Engine coolant level sensor

    Started by T.Elsten‎, 09-27-16 04:42 AM
    • Replies: 0
    • Views: 179
    09-27-16, 04:42 AM Go to last post
  16. Stripped4.9 headbolt

    Started by cutlass72‎, 05-15-09 02:41 PM
    • Replies: 5
    • Views: 672
    09-14-16, 06:36 PM Go to last post
  17. Need trouble codes for '83 HT-4100 Eldo

    Started by baldizzone‎, 06-22-04 12:00 PM
    • Replies: 6
    • Views: 4,849
    08-23-16, 04:13 AM Go to last post
  18. E91 Code

    Started by waltgaffney‎, 08-22-16 01:14 PM
    • Replies: 0
    • Views: 162
    08-22-16, 01:14 PM Go to last post
  19. Unhappy Eldorado 4.1 motor problem

    Started by Pete Newman‎, 02-06-05 12:07 PM
    • Replies: 7
    • Views: 1,009
    08-17-16, 12:47 PM Go to last post
  20. Performance engine for Deville 1984

    Started by Glibcon‎, 07-07-16 06:13 PM
    • Replies: 1
    • Views: 331
    07-07-16, 06:40 PM Go to last post
  21. Coupe DeVille 4.1 1984 Error codes 32,34,36,52

    Started by SamDeVi‎, 06-15-16 02:36 PM
    • Replies: 1
    • Views: 286
    07-06-16, 11:19 PM Go to last post
  22. 4.9 injector replacement questions

    Started by CaddilacJohn‎, 05-26-16 11:05 PM
    • Replies: 2
    • Views: 397
    06-02-16, 06:15 PM Go to last post
    • Replies: 4
    • Views: 454
    05-28-16, 11:36 AM Go to last post
  23. 4.9 High NOx, Failed Smog, stumped and need help!

    Started by CADDCT‎, 04-03-16 09:56 PM
    • Replies: 7
    • Views: 650
    05-23-16, 06:09 AM Go to last post
  24. Minimum Air Settings for 82 Cad 4.1 V8 HT4100

    Started by hotrodjohn71‎, 04-19-16 02:11 PM
    • Replies: 2
    • Views: 345
    05-19-16, 11:32 AM Go to last post

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