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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. What's the difference between ignition modules?
  2. Very strange engine problem 4.9L =HELP=
  3. 92 Deville 4.9 miss at idle
  4. 92 Deville blown headgasket or intake manifold?
  5. 1995 devile "service engine soon" light comes out , need help
  6. 91 Sedan DeVille Stall
  7. 1985 DeVille allternator wire (brown)
  8. 88 DeVille ELC not functioning
  9. 1988 DeVille Motor Mount Help
  10. heater hoses, any tips how to get these out?
  11. strut/axle/transmisiion problem
  12. Power Steering Woes
  13. flushing radiator fluid
  14. Break Release?
  15. '83 Eldorado with HT4100 V8, Rebuild or Replace?
  16. 89 coup deville coolant leak
  17. removeing crankshaft pulley bolt
  18. Back to my coolant flow problems
  19. help needed "no charge" light 83 eldorado 4.1
  20. Quick, Simple Question.
  21. 84 coupeD 4.1
  22. Engine Compartment Diagram Needed
  23. Re-install distributor
  24. Where to get a water pump pulley
  25. Don't deal with Remanufactured.com
  26. 1982 Cadillac Fleetwood. Code 52 PCM Reset. Dead Alternator. And my friends screw up.
  27. Vacuum on 4.5 Seville
  28. Alternator Bracket for Eldorado '85
  29. Different 4.1s?
  30. 91 Sedan Deville 4.9L CAR WON'T START
  31. 1992 Cadillac DeVille FOR SALE!!!!
  32. Fuel Injector 4.5
  33. 91 seville suspension dryer
  34. Voltage discrepancies
  35. Best way to clean out dead gas residue in tank?
  36. 4.9 map sensor problem?
  37. '91 Fleetwood Coupe has demons under the hood
  38. Replaced Head Gasket
  39. Looking for online source for TVS Switch for 85 HT4100
  40. I plan to make more of an appearance here...
  41. 93 4.9 motor
  42. intake manifold insides
  43. ISC pricing?
  44. coolant leak (pics)
  45. 91 seville heater control valve?
  46. 4.1 swap
  47. replacement valve covers
  48. 1992 DeVille Tune Up
  49. surging, only when warm
  50. 91 seville 4.9l owners manual
  51. Won't start. E12 .
  52. 4.9 wont stay running/wont start
  53. Anybody have a 91 seville 4.9l
  54. 1990 deville won't stay running
  55. 4.9L Spark Knock
  56. seperating engine and transmission
  57. 4.1 to Olds 403 swap
  58. 1994 cadillac sedan deville 4.9l please help!!
  59. ISC plunger question
  60. weird noise then belt pops off
  61. 91 seville 4.9 wheels?
  62. Service soon - refer to owners manual
  63. 91 seville trunk pull-down motor
  64. My engine build up
  65. PO39 and IO39 codes
  66. Car will not start-Distributor
  67. wats the MAP sensor
  68. high side temperature sensor circuit
  69. wats history after a code mean and how do i refesh list
  70. 92 deville wont start
  71. unbolting torque converter from flexplate
  72. Cracked head or head gasket
  73. 1983 4.1 Vs. 1985 4.1
  74. Another Anti Freeze question
  75. New problem
  76. Mixed up spark plug wire chaos!!!!!
  77. 91 seville 4.9 fan problems
  78. 94 Deville 4.9L
  79. 94 Cadillac SLS Idle Probelms
  80. Where to purchase a new ISC motor?
  81. Relay
  82. Question
  83. Head Bolt Torque Specifications?
  84. gasket question
  85. How hard it is to remove intake manifold???
  86. Diagram
  87. Real problem
  88. Extra HP & Torque
  89. How to adjust ISC
  90. replaced waterpump
  91. "Sail on" after cleaning throttle body
  92. Exhaust Gas in Radiator
  93. 2003 dhs trouble code p0300
  94. Cadillac trouble
  95. Cadillac trouble
  96. 1994 Deville leaking coolant
  97. 83 4.1 misfiring bad when running cold at constant speed
  98. Engine (4.1) won't start, stumbling when starting
  99. Dipstick doesn't match crankcase oil level
  100. The end is near? The end is here?
  101. Changing the FDR: What do I need?
  102. loss of hp?
  103. 93 eldo 4.9 overheating
  104. 93 exhaust question
  105. Prolly a dumb question:
  106. New Distributor Help
  107. water drowning out 84 caddy
  108. is it my spark plugs?
  109. Finally....Start-Up
  110. New problem: racing after cold startups now
  111. Common 4.1L Problems
  112. 91 deville surging idle
  113. '85 Fleetwood FWD 140K+ Miles! Hose questions
  114. Still got a miss at times
  115. Distributor won't drop.....
  116. '94 Sedan Deville, Parting out...Complete car
  117. 4.5 mess
  118. 4.9 intake gaskets
  119. Vacuum tube replacement
  120. Changing belts on 84 deville
  121. Coolant leak from WP cover
  122. Distributor Compatiblity 4.9 into a 4.5?
  123. Heater Core Removal 83 Eldorado
  124. 91 deville needs head gasket
  125. Sluggish acceleration
  126. 93 Eldorado clunking under load
  127. 4.1 just cuts out then comes back
  128. Oil pan gasket: Is it worth it?
  129. 4x engine as boat power?
  130. Cat converter exhaust flange
  131. Cooling system sealant
  132. 1983 4.1, 6 mpg in town driving ????
  133. 4.9 Headgasket ?
  134. E13, e44
  135. Help w/ Temp Fan Light on '85 Deville
  136. 15w-40 too heavy for a 61k mile 4.5?
  137. Operating temp: Whats the norm?
  138. The Last Stretch:Tranny Mods.
  139. timing marks
  140. Distributor Wiring Harness Compatability?
  141. Going from conventional to Synthetic - Good or bad?
  142. E46 code
  143. E98?
  144. 4.9 Lifespan?
  145. Return Line Pressure?
  146. 92 seville 4.9L engine problem
  147. alternator question
  148. Odd "Cold" Idle
  149. Rotten 4.1 do they just normally overheat ???
  150. Starter Change
  151. 83 Eldorado No power to HVAC controls or Mileage calculator
  152. Cam position sensor replacement
  153. A.L.D.L connector, setting timing
  154. The 93 SDV is dead!
  155. 1989 Seville Transmission shifts - Vac Modulator?
  156. thinking about 1994 Sedan deville
  157. Will there be a mess
  158. 1990 Eldorado runs ruff
  159. The 6 flexplate to crankshaft bolts
  160. Coolant
  161. Well, found one of my oil leaks...
  162. 92 Deville Shuts of suddenly
  163. Exhaust manifold gasket set
  164. Fuel Pump Cheat?
  165. 1995 Devile 4.9 Oil Leak
  166. Found my oil-leak
  167. Check this guy out: 91 Seville with 'questionable' mods
  168. Hose substution
  169. Thermostat
  170. Which of these?
  171. New Performance 4.9 Injector Mod. and Adjustable Fuel Pressure Regulator
  172. 1994 Cadillac Deville High Idle
  173. 91 deville, dead miss
  174. heater controls 92 eldo.
  175. How many tablets or bars leak?
  176. Distributor Help
  177. Proper Spark Plug Gap for 4.5
  178. 1990 Deville 4.5 help
  179. Yes, I Did It
  180. Harmonic Balance
  181. ECM Swap! PASSkey Question...
  182. Accel Performance Ignition Module: Real or B/S?
  183. 4100 engine temperature
  184. '90 4.5 No Cam Sensor Reference Signal Journey Through Hell!
  185. Ongoing Issues, running rough poor idle
  186. Trans cooler flush
  187. screw the whole thing - i hate the 4100... swap ideas?
  188. oil sender location - 4.1
  189. code po23??? Any thoughts
  190. 4.9 exhaust info
  191. Throttle valve cable '85
  192. oil pressure light came on - towed home
  193. clackin noise 4.9 deville
  194. Oil-leak solved!
  195. WOW this is a 4.9
  196. PO48 Current/ EGR Fault
  197. Oil Pressure
  198. E98 code on 4.5
  199. ...the HG gremlin got me
  200. Help identify 4.9 engine noise (video included)
  201. Head Gasket 91 caddy
  202. Once again......no joy
  203. BCM Location?
  204. Oil-tube gasket & o-ring
  205. 84 cdv 4100
  206. Question on oil leak - 1989 Seville
  207. No Joy....
  208. RTV on Oil-Pan gasket
  209. Block number?
  210. One problem fixed another shows up. Starter
  211. 4.9 Software
  212. How do I bypass PASKEY
  213. Rough running, bad mileage, unstable idle
  214. Trouble Starting When Warm
  215. Clattering noise from engine front area
  216. What is this hose called???
  217. 83 Eldorado 4.1 auto OD Trans Model # Please
  218. 1986 deville 4.1L
  219. Sedan Deville 4.1 to 4.5 Disaster Swap “This time I got right” part 2
  220. 89 Seville ignition switch click - VATS?
  221. Which a/c compressor to buy for round 4...advice please
  222. Carnut, got it to work, Thanks !
  223. wont start when warm
  224. B336 code, 86 seville
  225. transmission parts and specks
  226. Transmission advice
  227. 4.5-4.9 less inclined for h.g. problems
  228. Transmission Cooler Lines
  229. Severs Idle Problem
  230. 83 Eldo 4.1 Hesitation upon accelleration
  231. Coolant Change and GM Sealant Questions
  232. 95 DeVille PCM Codes
  233. Cleaning an ISC motor from a 1989 Seville
  234. Water in oil - Head/intake maniforld gasket job
  235. Loud bang, car won't turn over. 4100 '82 Deville
  236. Coolant Leak
  237. A/C Compressor Clutch Engagement Issues
  238. 83 Eldo 4.1 Climate Control only lights sometimes
  239. 1989 Deville code help
  240. 1989 Deville code help
  241. 83 4.1 overheated, now, an ISC problem !
  242. car doesn't switch to 3rd gear
  243. Performance 4.9
  244. New Life
  245. 92 Deville 4.9 FPR
  246. plug wire routing conduit/loom
  247. Alternator Pulley
  248. 88 Sedan Deville 4.5L intermittently starts, sometimes dies driving
  249. gear indicator fault :(
  250. 4100 Fuel Problem - Advice Please...