: HT4100 4.1, 4.5, 4.9



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  1. Second generation HT4100
  2. 1984 Fleetwood Code 52 ECM memory reset problem
  3. 84 Eldorado No Start
  4. engine rev's and dies
  5. Engine revs when I turn the wheel????????
  6. throddle control
  7. something happened today with the 90 deville and i don't know what
  8. unique problem 4.9
  9. Stoneys Main Bearing Diary
  10. nees help fast please
  11. 4.9 timing is hard! Idles rough, stumble on acceleration
  12. Water Pump Leakage!!!
  13. Min air ????
  14. Help with a water pump installation!!
  15. How to replace water pump on 92 seville?
  16. Another TPS ?????
  17. 87 Deville 4.1- No fuel!!!!!
  18. horsepower for 4.9
  19. A question for the gurus
  20. Trans cooler leak!
  21. 1990 Cadillac Sedan Deville high idle
  22. new oils verses old oils
  23. Minimum IDLE SCREW adjustment
  24. Oil cooler line o-ring
  25. Is my ISC motor shot? ('90 4.5L)
  26. Help with identifying a GM Goodwrench replacement block.
  27. Where is the MAP sensor located ???? 84 Seville
  28. 89 Deville engine pinging under load when warm
  29. new isc and tps
  30. Code Triggered: E66
  31. Low oil pressure at idle
  32. 4.x starter interchange list
  33. 4.9 91' coupe suspension level
  34. 4100 timing question
  35. Where do these fuel lines run??
  36. 1990 Sedan Deville 4.5L A Few Questions
  37. Uneven idle
  38. Teardown set for friday ...
  39. Ac Compressor
  40. Is this repair worth it?
  41. How Hot is too hot, Ouchi Hottie story inside.
  42. 89 cadillac 4.5 oxygen sensors
  43. Bore spacing
  44. 87 Deville NO FUEL!!!!
  45. FWD HT4100 air pump pupose?
  46. pinhole in block, leaks coolant, what should I do?
  47. 4.9 Just started running rough at idle
  48. Repair cost too high?
  49. 1990 Cadillac Sedan DeVille - Idling Too High
  50. HT4100 valve train pics
  51. Thermosat Question
  52. Am I stuck having to use an 80 series muffler?
  53. Strange COOLANT SENSOR readings--And engine cuts out while driving!!!
  54. water pump
  55. Oil Pan Gasket replacement on a 4.5L
  56. Error Code E41 Camshaft Position Sensor
  57. 4.9 starter problems
  58. 94 deville runs rough at cold start
  59. So Even After $700 dollars it still leaks!
  60. Swap ?'s
  61. Emission test failure
  62. How do I get my 4.5L to coast down to the "70 mpg" benchmark?
  63. A question about the Rotella Motor Oil
  64. Pls Help 4.9 ac compressor froze
  65. Deville shakes violently .. Please help!
  66. 1993 Deville ODB Codes Tripped, Idle Motor
  67. EGR valve replacement fixed the knocking problem!
  68. water pump leaking after i change it
  69. How to enter override E.5.3 on a '90 DeVille
  70. Hose question & error code 30 and 34
  71. 87 Deville Intake
  72. 4.9 intake manifold
  73. Feels like mis-fire. 85 fleetwood 4.1
  74. Engine replacement on an 88 Coupe
  75. fuel pump?????
  76. wot's and front oil seal
  77. oil pan gaskets
  78. emissions failed
  79. Crossover pipe
  80. I got into my diagnostics w/o a clue
  81. Code P039 Current?
  82. error code
  83. Pump thingy :/ 4.1 HT
  84. Programers???
  85. first service on my 89 deville
  86. stumbling, hesitation under load only
  87. 4.9 acceleration? ? ?
  88. Head or Intake?
  89. Are 1990 Throttle bodies obsolete?
  90. 91 DeVille Stalls Repeatedly
  91. Engine Soon EGR code
  92. Motor mounts/CV Joint
  93. Motor mounts/CV Joint
  94. Motor mounts/CV Joint
  95. Deville Acclerating
  96. need help
  97. i need help
  98. 4.5 to 4.9?
  99. HT4100 MSD IGNITON, should I ?
  100. Cooling Pipe Crack
  101. HT4100 Question
  102. 4.9l bolt on mods??
  103. I hate this car.
  104. Stumbling, hesitation, backfiring 89 Deville 4.5
  105. Distributor cap wiring help!!! 4.5 litre 89 deville
  106. HT4100 vacuum pump
  107. Yet another head gasket question
  108. Fuel injection question
  109. Fuel tank baffles or pump?
  110. 88 Coupe Deville Intake Manifold or Head gasket
  111. Help required !!
  112. Crazy Cadillacs
  113. This is a weird one
  114. Ok Guys, So what parts break? Engine Wise.
  115. 91 deville runs a little hot
  116. Fuel Pump Revisited
  117. 4.9 knocking
  118. WTF? Why won't this thing just blow up...
  119. 95 deville idle problem...2
  120. Deville 4.1 fwd rear main oil seal leak :(
  121. water pumps
  122. Nasty squeal - water pump?
  123. what EXACTLY do I need...?!
  124. 1988 Cadillac Coupe Deville Head Gasket
  125. Thermostat housing torque specs
  126. Engine compartment revisions!
  127. 1990 fleetwood engine miss please help
  128. I think I need a distributor 89 Deville 4.5
  129. A blog for Caddy fans
  130. MGB 4.5 project
  131. E52 code
  132. spark wires cover - removal help
  133. 1990 deville 4.5 won't even turn over
  134. water pump replacement
  135. Wheel Bearing installation - help....
  136. Remeber where those vac lines go.....
  137. E Codes on my 4.5 HELP
  138. E39 and E48 codes could I get some advice?
  139. Can anything go wrong/Flushing coolant?
  140. Another way to pull codes?
  141. Camshaft lifter questions
  142. exhaust manifold
  143. 4.5L ECM inputs
  144. Why I hate NTK Oxy Sensors from Now ON.
  145. Coolant pellets/conditoner
  146. Prob with 86 deville sedan with 4.9L *HELP*
  147. Ported vacuum switch--supposed to have a wire connected to it?
  148. 4.9L Aluminum Head project?
  149. Stoneage_caddy I had my car's fuel preasure checked today,have a couple of questions
  150. Anyone running an Auto meter Air/Fuel Ratio meter.
  151. What O2 sensor(s) are you using.
  152. antifreeze for my 85 fleetwoods ht4100
  153. Antifreeze for my HT4100
  154. 1989 Eldorado Biarritz MPG
  155. 1991 deville engine dies when coasting
  156. The Homemade 5 Liter PFI Project .....
  157. 85 seville valve lifters
  158. Blown 4.1 ht in 83 eldorado ?? how to tell ?
  159. Bogging problem
  160. Throttle body problem, help please
  161. I knew I saw it someplace, now where did it go, no not my sanity but close?
  162. 4.5......which sensor is bad?
  163. 4.9 bearing part number or TSB?
  164. Help with HT4100 water pump
  165. which is the better motor
  166. Nitrous Question
  167. 1995 DeVille Idle Fluctuation
  168. issues w/ back pressure?!?
  169. Well the pump is on, but my serpentine belt...what?
  170. 83 Sedan Deville 4100
  171. Its an Invasion 4.9, 5spd Stick Fiero
  172. why I love my 4.5...
  173. 1985 deville coolant and heater core questions.
  174. New member here, and I need some '93 Deville help (water pump installation)
  175. 1990 Allante Bosch fuel injectors/FiveOMotorsports
  176. Cleaning '90 EGR 4.5
  177. Groll Polluter FIXED??????????????????
  178. Where does this fuel line run?
  179. 88 Deville.Tensioner Pulley.
  180. 85 4100 is running rough and hesitating
  181. car will not go past 35mph 82 with a 4.1
  182. Does anyone have a picture or info on the Negative block ground?
  183. EGR Cleaning
  184. Cheap quality Rebuilt transmissions
  185. 4.5 Fast Idle problem
  186. I need a no Yo-Yo shift-kit immediately!! '84 RWD DeVille
  187. 93 Runs rough & loud when wet
  188. Spark Plug Replacement
  189. Fuel Injector Compatiblity
  190. Oil pan gasket
  191. No Spark/ No Start Problem/ Pulling what hair I have left out!
  192. oil change
  193. Accel fuel injectors
  194. Alldata (autozone)????????????????????
  195. A/C Compressor
  196. Help ECM E85
  197. Fuel Pumps on '82-85 HT4100 -- Life span??
  198. Analyzing Fuel Economy
  199. Difference between '82 vs '85 Fuel Injectors on the HT4100????
  200. Oil Theories
  201. Got Injectors? 4.9/4.5
  202. E048
  203. Why Wont This Car Start After I Put In A New Alternator.
  204. '85 Throttle Body in an 82 Eldo???
  205. 4.9 knocking
  206. Hole In Muffler(Recommended Replacement)
  207. 91 DeVille
  208. In reguard to my deville's rough idleing,could it just need an induction service?
  209. Code question.
  210. Plugs for 4.9
  211. 1994 Deville 4.9 (Serpentine Belt) - Save Me From the Junk Yard
  212. Inaccurate gas readout?
  213. 1990 Allante fuel injectors
  214. 4.9 with sleeves?
  215. 4.9 Air Cleaner
  216. Stoneage_caddy my deville is stuttering when idleing,any ideas?
  217. 92 4.9 fleetwood high idle
  218. 1994 4.9L won't pass emissions HCs too high How to fix?
  219. HELLO - I'm seeing an error code 52 - any idea what that means?
  220. 4100 Reliability
  221. 1982 eldorado low oiil pressure light on immediately after oil change??
  222. 82 deville VIBE SOLVED
  223. let the thing blow up??
  224. Low Oil Pressure Light 1982 eldorado
  225. engins problem
  226. radiator blew apart
  227. new to the forum - big problem
  228. Whats the best place to find a replacment 4.9
  229. RE: 82 deville
  230. 4.1 ELDO Hesitation and Stall
  231. 84 4.1 Eldo
  232. Fuel Injectors
  233. Regular gas vs. premium gas
  234. used injectors
  235. 82 deville vibration
  236. '84 Eldo Failed NOx
  237. Wow...26+ MPG in a 3900# vehicle with over 700 lbs of cargo/passengers
  238. Collapsed UPPER Rad Hose!
  239. injectors
  240. 4.9 Froze
  241. 4.1 Giving 3 codes...Need help
  242. Is the 4.9 Under Rated?
  243. I need a water pump have a couple of questions.
  244. 4.1 v6, 4.1 v8-- What's the differance?
  245. Dip Stick Tube
  246. 85 Fleetwood Brougham W/ 4100 -- No Start...
  247. Open or closed deck block
  248. Emission Results fine in set timing mode?
  249. A new problem...
  250. 4.9 Dead - How easy to swap in a 4.5?