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View Full Version : HT4100 4.1, 4.5, 4.9

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