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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. 1982 eldorado low oiil pressure light on immediately after oil change??
  2. 4100 Reliability
  3. HELLO - I'm seeing an error code 52 - any idea what that means?
  4. 1994 4.9L won't pass emissions HCs too high How to fix?
  5. 92 4.9 fleetwood high idle
  6. Stoneage_caddy my deville is stuttering when idleing,any ideas?
  7. 4.9 Air Cleaner
  8. 4.9 with sleeves?
  9. 1990 Allante fuel injectors
  10. Inaccurate gas readout?
  11. 1994 Deville 4.9 (Serpentine Belt) - Save Me From the Junk Yard
  12. Plugs for 4.9
  13. Code question.
  14. In reguard to my deville's rough idleing,could it just need an induction service?
  15. 91 DeVille
  16. Hole In Muffler(Recommended Replacement)
  17. 4.9 knocking
  18. '85 Throttle Body in an 82 Eldo???
  19. Why Wont This Car Start After I Put In A New Alternator.
  20. E048
  21. Got Injectors? 4.9/4.5
  22. Oil Theories
  23. Difference between '82 vs '85 Fuel Injectors on the HT4100????
  24. Analyzing Fuel Economy
  25. Fuel Pumps on '82-85 HT4100 -- Life span??
  26. Help ECM E85
  27. A/C Compressor
  28. Alldata (autozone)????????????????????
  29. Accel fuel injectors
  30. oil change
  31. No Spark/ No Start Problem/ Pulling what hair I have left out!
  32. Oil pan gasket
  33. Fuel Injector Compatiblity
  34. Spark Plug Replacement
  35. 93 Runs rough & loud when wet
  36. I need a no Yo-Yo shift-kit immediately!! '84 RWD DeVille
  37. 4.5 Fast Idle problem
  38. Cheap quality Rebuilt transmissions
  39. EGR Cleaning
  40. Does anyone have a picture or info on the Negative block ground?
  41. car will not go past 35mph 82 with a 4.1
  42. 85 4100 is running rough and hesitating
  43. 88 Deville.Tensioner Pulley.
  44. Where does this fuel line run?
  45. Groll Polluter FIXED??????????????????
  46. Cleaning '90 EGR 4.5
  47. 1990 Allante Bosch fuel injectors/FiveOMotorsports
  48. New member here, and I need some '93 Deville help (water pump installation)
  49. 1985 deville coolant and heater core questions.
  50. why I love my 4.5...
  51. Its an Invasion 4.9, 5spd Stick Fiero
  52. 91 Sedan Deville Air Conditioning question
  53. 83 Sedan Deville 4100
  54. Well the pump is on, but my serpentine belt...what?
  55. issues w/ back pressure?!?
  56. 1995 DeVille Idle Fluctuation
  57. Nitrous Question
  58. which is the better motor
  59. Help with HT4100 water pump
  60. 4.9 bearing part number or TSB?
  61. 4.5......which sensor is bad?
  62. I knew I saw it someplace, now where did it go, no not my sanity but close?
  63. Throttle body problem, help please
  64. Bogging problem
  65. Blown 4.1 ht in 83 eldorado ?? how to tell ?
  66. 85 seville valve lifters
  67. The Homemade 5 Liter PFI Project .....
  68. 1991 deville engine dies when coasting
  69. 1989 Eldorado Biarritz MPG
  70. Antifreeze for my HT4100
  71. antifreeze for my 85 fleetwoods ht4100
  72. What O2 sensor(s) are you using.
  73. Anyone running an Auto meter Air/Fuel Ratio meter.
  74. Stoneage_caddy I had my car's fuel preasure checked today,have a couple of questions
  75. 4.9L Aluminum Head project?
  76. Ported vacuum switch--supposed to have a wire connected to it?
  77. Prob with 86 deville sedan with 4.9L *HELP*
  78. Coolant pellets/conditoner
  79. Why I hate NTK Oxy Sensors from Now ON.
  80. 4.5L ECM inputs
  81. exhaust manifold
  82. Camshaft lifter questions
  83. Another way to pull codes?
  84. Can anything go wrong/Flushing coolant?
  85. E39 and E48 codes could I get some advice?
  86. E Codes on my 4.5 HELP
  87. Remeber where those vac lines go.....
  88. Wheel Bearing installation - help....
  89. water pump replacement
  90. 1990 deville 4.5 won't even turn over
  91. spark wires cover - removal help
  92. E52 code
  93. MGB 4.5 project
  94. A blog for Caddy fans
  95. I think I need a distributor 89 Deville 4.5
  96. 1990 fleetwood engine miss please help
  97. Engine compartment revisions!
  98. Thermostat housing torque specs
  99. 1988 Cadillac Coupe Deville Head Gasket
  100. what EXACTLY do I need...?!
  101. Nasty squeal - water pump?
  102. water pumps
  103. Deville 4.1 fwd rear main oil seal leak :(
  104. 95 deville idle problem...2
  105. WTF? Why won't this thing just blow up...
  106. 4.9 knocking
  107. Fuel Pump Revisited
  108. 91 deville runs a little hot
  109. Ok Guys, So what parts break? Engine Wise.
  110. This is a weird one
  111. Crazy Cadillacs
  112. Help required !!
  113. 88 Coupe Deville Intake Manifold or Head gasket
  114. Fuel tank baffles or pump?
  115. Fuel injection question
  116. Yet another head gasket question
  117. HT4100 vacuum pump
  118. Distributor cap wiring help!!! 4.5 litre 89 deville
  119. Stumbling, hesitation, backfiring 89 Deville 4.5
  120. I hate this car.
  121. 4.9l bolt on mods??
  122. HT4100 Question
  123. Cooling Pipe Crack
  124. HT4100 MSD IGNITON, should I ?
  125. 4.5 to 4.9?
  126. i need help
  127. need help
  128. Deville Acclerating
  129. Motor mounts/CV Joint
  130. Motor mounts/CV Joint
  131. Motor mounts/CV Joint
  132. Engine Soon EGR code
  133. 91 DeVille Stalls Repeatedly
  134. Are 1990 Throttle bodies obsolete?
  135. Head or Intake?
  136. 4.9 acceleration? ? ?
  137. stumbling, hesitation under load only
  138. first service on my 89 deville
  139. Programers???
  140. Pump thingy :/ 4.1 HT
  141. error code
  142. Code P039 Current?
  143. I got into my diagnostics w/o a clue
  144. Crossover pipe
  145. emissions failed
  146. oil pan gaskets
  147. wot's and front oil seal
  148. fuel pump?????
  149. Engine replacement on an 88 Coupe
  150. Feels like mis-fire. 85 fleetwood 4.1
  151. 4.9 intake manifold
  152. 87 Deville Intake
  153. Hose question & error code 30 and 34
  154. How to enter override E.5.3 on a '90 DeVille
  155. water pump leaking after i change it
  156. EGR valve replacement fixed the knocking problem!
  157. 1993 Deville ODB Codes Tripped, Idle Motor
  158. Deville shakes violently .. Please help!
  159. Pls Help 4.9 ac compressor froze
  160. A question about the Rotella Motor Oil
  161. How do I get my 4.5L to coast down to the "70 mpg" benchmark?
  162. Emission test failure
  163. Swap ?'s
  164. So Even After $700 dollars it still leaks!
  165. 94 deville runs rough at cold start
  166. 4.9 starter problems
  167. Error Code E41 — Camshaft Position Sensor
  168. Oil Pan Gasket replacement on a 4.5L
  169. water pump
  170. Strange COOLANT SENSOR readings--And engine cuts out while driving!!!
  171. Am I stuck having to use an 80 series muffler?
  172. Thermosat Question
  173. HT4100 valve train pics
  174. 1990 Cadillac Sedan DeVille - Idling Too High
  175. Repair cost too high?
  176. 4.9 Just started running rough at idle
  177. pinhole in block, leaks coolant, what should I do?
  178. FWD HT4100 air pump pupose?
  179. 87 Deville NO FUEL!!!!
  180. Bore spacing
  181. 89 cadillac 4.5 oxygen sensors
  182. How Hot is too hot, Ouchi Hottie story inside.
  183. Is this repair worth it?
  184. Ac Compressor
  185. Teardown set for friday ...
  186. Uneven idle
  187. 1990 Sedan Deville 4.5L A Few Questions
  188. Where do these fuel lines run??
  189. 4100 timing question
  190. 4.9 91' coupe suspension level
  191. 4.x starter interchange list
  192. Low oil pressure at idle
  193. Code Triggered: E66
  194. new isc and tps
  195. 89 Deville engine pinging under load when warm
  196. Where is the MAP sensor located ???? 84 Seville
  197. Help with identifying a GM Goodwrench replacement block.
  198. Is my ISC motor shot? ('90 4.5L)
  199. Oil cooler line o-ring
  200. Minimum IDLE SCREW adjustment
  201. new oils verses old oils
  202. 1990 Cadillac Sedan Deville high idle
  203. Trans cooler leak!
  204. A question for the gurus
  205. horsepower for 4.9
  206. 87 Deville 4.1- No fuel!!!!!
  207. Another TPS ?????
  208. How to replace water pump on 92 seville?
  209. Help with a water pump installation!!
  210. Min air ????
  211. Water Pump Leakage!!!
  212. 4.9 timing is hard! Idles rough, stumble on acceleration
  213. nees help fast please
  214. Stoneys Main Bearing Diary
  215. unique problem 4.9
  216. something happened today with the 90 deville and i don't know what
  217. throddle control
  218. Engine revs when I turn the wheel????????
  219. engine rev's and dies
  220. 84 Eldorado No Start
  221. 1984 Fleetwood Code 52 ECM memory reset problem
  222. Second generation HT4100
  223. Gurgling Sound In Engine?
  224. HT 4100 - Success stories
  225. 4.9L Fuel Economy
  226. Oxygen Sensor
  227. Not again!!
  228. Not getting enough spark
  229. Fuel Pump Relay
  230. 95 4.9 flywheel breakage?
  231. Valve Lash Adjustment
  232. Can't get my 4.9 to Adjust timing
  233. Fuel injector problem?
  234. 94 Deville misses backfires & DIES! whats wrong
  235. '90 DeVille ISC motor problem SOLVED
  236. engine miss 4.5 ???
  237. Braking Engine Jump... 1990 DeVille
  238. Underdrive pulleys?
  239. Ram Air/Cold air intake for 4.9?
  240. engine change
  241. 4.9 in Brougham??
  242. I want a DIC (get your mind out of the gutter) :D
  243. What is the Factory Timing for a 93 Eldorado
  244. Does everyone have mandrel-bent piping?
  245. Fastchip - Does it work?
  246. frontend noise
  247. 1984 Eldo 4.1 Engine Color Needed
  248. Replaced everything...stumble is worse.
  249. Error code 29
  250. Cold air zapping coil!