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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. ECM software
  2. 130 mph in a 4.9!
  3. Frozen Pulley
  4. Ignition Module issue
  5. Removing EGR valve - 4100
  6. Bad alternator in 93 Deville, need help
  7. Restore Lubricants
  8. Bad Head Gasket 92 DeVille 4.9- Need opinion
  9. Throttle Position Sensor Misadjusted
  10. A.I.R. Pump 4.5l '89 Deville
  11. temp sensor
  12. Don't ask oil questions on this site.
  13. 1985 deville died
  14. where do i go from here
  15. Need Help On Two More Things
  16. serious help needed
  17. 1983 Caddy transmission
  18. Strange Timing Issues
  19. Mobil 1 10W30
  20. 1985 Deville with a 4100 and it will not crank
  21. 1985 Deville with a 4100 and it will not crank
  22. Code E48 diagnosis
  23. codes ???please help
  24. 4.5 Allante intake on 93 4.9 deville
  25. New Trouble Code
  26. 1989 Caddy Deville......
  27. Throttle Body Plate issue
  28. Code and Coolant Prob.
  29. Low oil pressure!
  30. Oil Cooler Lines Leaking
  31. 1989 Caddy Deville......help!!!
  32. Stallling at idle
  33. gas pedal
  34. 4.5 TBI rough idle
  35. 94 Deville has almost no power from start
  36. 84 eldo conv't - 70 weight oil - yes or no?
  37. E012,E053 Won't run
  38. 1990 Seville Timing chain?
  39. 4.9 groaning
  40. '84 Eldo Code 44
  41. HT-4500 Starting trouble
  42. Speedometer Sensor issue ?
  43. The Ultimate FWD Cadillac Engine Swap
  44. Sticky Gas Pedal...4.5L
  45. Underhood smoking... need help with a diagnosis
  46. Fixed EGR now MPG is lower
  47. engin and trany swap for an 85 coupe deville
  48. Favorite things about the 4.9?
  49. 86 EGR Valve
  50. 4.5 TBI smoking
  51. Fuel pump on 4.9 92 Deville
  52. Fleetwood/DeVille Speedometer
  53. 4.1 Knock?? Or Tap??
  54. 1990 deville 4.5 air pump noisy
  55. 4.5L TBI Grumbling
  56. HT4500 and 4900 series Performance
  57. 4.1L injector
  58. how to get more hp from a 4100
  59. Intermittent Lurch—91 DeVille 4.9
  60. MAP Problems
  61. Oil Level
  62. How to start when very cold (less than 0 F)
  63. Need Help Please
  64. Engine surges at slow speed
  65. Stop Engine, Low Oil Pressure
  66. 1988 Fleetwood 4.5 Distributor order
  67. 1985 Seville Power Steering Pulley bolt
  68. Installing oil pump in 4.9 engine.
  69. 1985 deville ht4100 jump start
  70. GM Top End Cleaner Has Been Discontinued
  71. Makes Me Happy!
  72. HT4100 Question
  73. HT 4100 knock, 83 Eldorado (I know, another thread on this)
  74. Makes me nervous!
  75. 4.9 E55 code. TPS?
  76. Thoughts on the 4.5
  77. power steering leakk
  78. The SEA FOAM experience thread.
  79. Oh just great, a collapsed lifter in #1 cylinder!!
  80. 94 4.9 bypass siezed A/C compressor
  81. 85 Deville Still Has Poor Performance
  82. Need exhaust manifolds 4.1 HT4100
  83. 93 Deville stalls after car warms up
  84. New Caddy Owner, Need Some Help
  85. Rattle Under Car
  86. What kind of ISC motor should i get?
  87. 84 eldorado fuse panel pictures?
  88. Crack in my Block
  89. 93 DeVille AC converter clutch bypass ???
  90. Cooling System - Water Pump Conditioner/Anti-Rust
  91. Stock Exhaust dimensions on 93 Devilles
  92. Campaign 95-C-72 (recall)
  93. fuel pressure????
  94. Just finished my 4.9 Water pump repair pics inside
  95. 4.9L Rear Oil Leak
  96. Quick question: Ignition Control Module
  97. Disaster
  98. EGR Valve
  99. 4.1 main bearing thump
  100. Tranny problems, E39!! Please help, dont want to rebuild...
  101. 95 Deville 4.9 need help
  102. OMG water pump problem!
  103. Bypass Catalytic Converter on 1993 Deville?
  104. Starter motor gone on 87 deville 4.1
  105. Need help 4.9 L Fuel Delivery problem
  106. 92 4.9 DeVille runs horrible, sets codes
  107. Roller Lifters On The 4.9?
  108. water pump change on 4.1ltr
  109. 93 deville
  110. 1993 Cadillac Seville: Please Help starting problem
  111. Bad coil?
  112. Rebuilding a tbi on 89 deville
  113. I Broke it
  114. 4.9 Surges After Hot Start
  115. Poor mileage and slighly high HC levels
  116. engine oil cooler lines
  117. Smoke out of exhaust
  118. Cleaned out my EGR tubes today, my E.4.8 code is gone!
  119. code help
  120. Low mileage 4.9 Idling Rough Engine Sputters and quits
  121. First time Caddy owner needs some advice please
  122. Trouble with diagnostics
  123. changing oil pump in 90 deville 4.5
  124. Help I dont want to get rid of my car BUT!
  125. Has anyone changed their catalytic converter?
  126. 4.9 Liter idle
  127. Removing hydraulic fittings
  128. How many miles on the 4.9? ?
  129. 88 Sedan Deville not liking the winter
  130. Coolant hose to blower motor
  131. Timing Question
  132. '84 Eldorado blown head gasket?
  133. Oil pan heater?
  134. 4.9 Deville 95 whining noise like supercharger..
  135. Location of the CAM Position Sensor on the 95 4.9L deville?
  136. YES, i did it!!! All went well!
  137. 92 Eldo 4.9 for sale
  138. 4.5 water pump
  139. 93 4.9 STS wont start
  140. DESPERATELY Need Help!!! 85 CDV
  141. Trying to find good price on Allante gear reduction to use on my 4.9
  142. How to clean out EGR valves and throttle body?
  143. time for engine replacement soon-- help!
  144. Heater
  145. Hard starting
  146. 4.5 differences
  147. E98 rectification
  148. 87 fleetwood new ignition problem
  149. 1985 deville 4.1 Injector fuse keeps blowing
  150. PCM override, PS10
  151. EGR solenoid, is it normal?
  152. Get a LARGER capacity, 3 row radiator?
  153. Smoky when at full throttle!
  154. What does the code F.8.5 mean?
  155. 87 fleetwood 4.1 three problems,advice please!
  156. Removed Distributor--Question Before I Restart
  157. Changed the oil pump, lifter still taps on occasion warmed up..
  158. 87 deville, E48, EGR system problem
  159. Additive for newly remaned 86 DeVille Trans??
  160. Is it possible for a 4.9 main bearing thump to get progressively worse?
  161. 1989 Sedandeville issues
  162. 15W-40 Oil .....
  163. Fuel
  164. 82 eldorado alternator bracket
  165. 85 Deville ISC Problem--Might Have the Answer
  166. Help me Please!!!
  167. Weird idea
  168. Engine miss
  169. Pulled a thread
  170. E12 - No Distributor Signal???
  171. computer interchange, '90 Seville?
  172. Where Can I get some chips......
  173. Oil leak source...?
  174. well, i did it but...
  175. HT4100 ECM/BCM Problem?!
  176. #$$%^%@#$% damn .....floods on hot restart
  177. can't flush out "rubber glue type" coolant additive... what to do?
  178. Transmission Shift cable
  179. HT4100 ISC Help
  180. 4t60-E going out
  181. Fuel Issues - Please Help!
  182. 4t60-E FDR and the computer
  183. Fixed my car! Need help on one more thing...
  184. What's wrong with my car? The mystery continues...
  185. When i go to replace the mains....
  186. 4t60-E Shudder?
  187. last year
  188. All 4.x engine service parts are discontinued?
  189. Does anybody have a spare 4.9?
  190. Knock, Knock, Knock, 4.9L
  191. Alright, i'm going in!! I need a few parts and info please.
  192. 90 4.5L Idle Learn Procedure?
  193. I have a slight problem,,, HT4100
  194. Fuel Pressure Test Fitting
  195. 1985 Seville code e15
  196. Cooling Fan Module--Where can I get one?
  197. Bars Leaks Head Gasket Repair
  198. Code E30 on 85 Deville and Vacuum Pumps
  199. Copper Gaskets?
  200. Battery/ALternator area cracking noise?
  201. Oil Analysis: Proof is in the results
  202. 1992 Eldo
  203. That Funky Emissions Tubing
  204. Hey Guys long time no chat, and long time not wanting to start either.
  205. The once a year survival kit for the 4.X series
  206. 4.9 runs rough black exhaust from tail pipe
  207. 1985 Seville harsh shifting tranny
  208. Odd brief buzzing noise from undercarriage
  209. i need a 4t60e guru; i am hating mine
  210. what is up with my car
  211. Early vs. Late 1985 FWD 4100
  212. Strange ISC
  213. 1994 cadillac deville engine knocks when warm
  214. 4.5 --> 4.9
  215. Getting ready for water pump removal
  216. 1988 Eldorado 4.5
  217. 1985 FWD HT4100 Running rough
  218. Question about spark plugs!
  219. TPS problem?
  220. 4100 Mpg
  221. 87 deville 4100 shift problems
  222. 1991 DeVille Speedometer/Transmission Trouble.
  223. Starter solenoid replacement
  224. 4.9 Injector Replacement Questions
  225. 92 STS error code A048 what does that mean?
  226. 1994 Deville 4.9 Idler pulleys
  227. Please Help!!! Rough running 4.9 , Help!!
  228. 1994 Deville 4.9 spark knock
  229. 85 Sedan Deville Stalls after 20 Miles
  230. 4.9 Potential? (Split from "4.9 to a 5.0?")
  231. 94 Deville 4.9 switching complete sending/fuel pumps
  232. 4.9 to a 5.0?
  233. Fan Runs all the time on 4.9, engine runs real cold
  234. AHHH HELP!!! Keep overheating
  235. 4.5 Vs. 4.9
  236. Fuel Mileage vs. Data Center
  237. 92 4.9 flat cam?
  238. Does twitchy tach mean misfire?
  239. ht 4100 Hesitation
  240. 1987 SDV 4.1 L V-8 Available
  241. 89 4.5 TPS installations
  242. 89 Fleetword code (30) ISC Circuit
  243. Boiling coolant, fans not running, ...
  244. no start after warm engine
  245. 1989 4.5 Idle Speed Motor
  246. 1989 Fleetwood Idle Speed Motor
  247. Valve Adjustment 4.9 Engine
  248. remaned 4.1/4.5 short block
  249. 4100 to LT1 swap 83 Coupe Deville
  250. Cylinder head removal