: HT4100 4.1, 4.5, 4.9



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