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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. Will 4.5 exhaust manifolds fit the HT4100?
  2. Stupid question for smart people.
  3. '82 vs. '83 Eldo ECM--ARE THEY INTERCHANGEABLE?!? HELP!!!!
  4. Minor tune up
  5. Eldorado 4.1 motor problem
  6. my baby is sick again , why ??????
  7. car running rough now
  8. Need Help
  9. Whats The Best Oil for the HT4100???
  10. Sparkplugs
  11. intermittent problemn
  12. '82 Eldo Engine dying out, Backfiring through throttle body--Bbobynski please help!!!
  13. dieseling HT4100....
  14. Engine Fire!!! Why Me???
  15. Typical Driveability Problem - 90 Deville
  16. HT4100 swap. 4.5 or 4.9?
  17. Loose EGR tube
  18. ISC Unpluged , wont idle
  19. cadillac eldorado 1991 4.9
  20. 4.9 Fuel Filter clogging...
  21. coolant temp light???
  22. Issues with vacuum lines, Battery light, all in this issue of the 2dfx PMS Thread!
  23. AMAZING fix for hesitation, bad milage
  24. Can 4.1 be replaced with 305 fuel Injected?
  25. air pump to fan to crunk v belt
  26. Bad computer? Maybe
  27. 1992 DeVille Misfiring, or something.
  28. Rough Idle and Missing...
  29. Engine reliability?
  30. HELP! 1990 seville shifts to 3rd and freewheels
  31. new to me 85 coupe Deville
  32. 4.5 tbi- performance stuff??
  33. 91 4.9 Excessive Fuel Consumption
  34. Mind boggler engine noise
  35. Engine miss at highway speeds.
  36. Does it ever Stop!!!Tuned up and Tuned out
  37. timing newbbb
  38. bad throttle response
  39. Exhaust Condensation
  40. Benefit of using higher mileage vehicle oil?
  41. Boosting HT4100 Performance
  42. Engine Idle and "almost" stalling problems
  43. Code 33 Help!!!!
  44. Mobil 1 Extended Performance? BBob!
  45. Performance Mufflers for 4.9??
  46. Got a Reply! on HT4100 TO 4500 Conversion!
  47. Engine Oil Additive to stop leaks?!?
  48. Oil Light
  49. Trouble with O2 Sensor
  50. collectors,bbob anyone,long term storage
  51. fuel system??
  52. What is most likely source of oil leak?
  53. '90 DeVille 4.5L "hunts" for curb idle
  54. Timing Questions...
  55. Engine Swap
  56. Rebuilding an HT4100
  57. Ticking
  58. 4.9L '92 Knocking...or missing, help!
  59. How do you advance timing?
  60. A little oil here and a Little oil there
  61. Will a HT4100 go into an 88 Deville?
  62. Needle in a haystack E53
  63. Delco vs. Others
  64. EDAHALL! How do i post sound clips of my FLOWMASTER 40 SERIES delta with the HT4100
  65. now what ?
  66. Intake on a Deville...
  67. Dumb Tool Question?
  68. Startup problem
  69. Piston Rings
  70. Lucas oil treatment?
  71. Ht4100 Flowmaster Sound Clip!!!!!!!
  72. Blown Head Gasket maybe?????
  73. 4.9 engine idle speed...
  74. egr valve
  75. Another one knockin
  76. advanced timing
  77. intake question
  78. how do i use the codes
  79. Need information on an engine rebuild
  80. OK the 4.9 ECU mods thread ,lets go!
  81. Water
  82. 93 DeVille failed IL CO and HC emissions - need help
  83. Code E30 ( NO DASH!!! )
  84. code19
  85. The "4.9 liter turbocharger, stage 1" thread.
  86. Engine Misses when cold
  87. Left or Right Bank Fuel Imbalance
  88. 92 Help!!!
  89. Help!!!My caddy flunked the emmissions test
  90. Cheap HP´s?
  91. tranny slipping and e39 vcc
  92. HT4100 0-60 times!
  93. 4.5--->4.9? (maybe more)
  94. 1988 Deville Fast idle problems 4.5L
  95. Computer/wiring on 4.1L to 4.5L swap
  96. thermostat
  97. Does Anyone have F codes for a 93 deville
  98. Idle Speed Control Unit
  99. 4 prong spark plugs on 4.5
  100. 88 Deville...E30 & EE30 code
  101. 200R4 slipping real bad
  102. '90 Deville 4.5 idle problems
  103. 4.x dyno and comparison questions
  104. A few 4.x questions
  105. HT4100 "Base Timing Mode"
  106. Redline/Tachometer
  107. What is a BCM?
  108. What Is A PCM?
  109. Mixing oils...
  110. 93 weirdo miss
  111. Amsoil for 4.9
  112. What kind of problems do you get if you have a F32 code
  113. stock 4.9 intake to allante intake comparison
  114. Purchased 1984 Sedan Deville
  115. Question About Changing Water Pump
  116. 95 deville blown head gasket
  117. Cleaned egr tubes
  118. Transmission
  119. To ILLUMINA!!! RE Performance Parts for 4.9
  120. ISC Motor &TPS/E30 code
  121. 4.9 with 60K knocking, please help!!!!!!!!!!!
  122. Tranny Woes
  123. Where's the ALDL on my 88 Deville?
  124. GM parts vs Aftermarket- HT4100
  125. 86 Seville 4.1 advice re removal of water pump
  126. Bbob- Open Loop Better Than Closed??
  127. 92 seville performance help
  128. 4.9L compatable with small block???
  129. Fuel Injectors 94 Deville 4.9L
  130. '92 4.9 Stalling after transmission rebuild
  131. questions on 4.9l v8
  132. Anyone Need a HT 4100
  133. 4.1 Eldorado Oil Pan Gasket Change; MAJOR PAIN!
  134. Install Separate Thermostatic Fan Control?
  135. 4.9 60k knock gone!!!!!!!!!!!!!!!!!
  136. '85 Deville running rich
  137. Air Management System Problem
  138. surging power
  139. 84 deville died, won't restart ht4100
  140. 4.5L Idle Problem Solved!! Thanks, bbobynski
  141. Porting on HT4100's
  142. 4.9 valve cover
  143. Is this the same knock as the 4.9 knock? It is an HT4100
  144. help my overheat um i think
  145. Engine Knock
  146. 4-9 Fuel Pump Psi
  147. please help
  148. 1990 bcm code e-47
  149. Coolant Pellets? How Many?
  150. Noise Under Hood When Turning Ignition On and Off
  151. Rotella coolant.
  152. 85 seville transmission
  153. Fuel Economy and Engine Power
  154. Looking for used v-8 intake
  155. i want to make sure
  156. Oil drain plug stuck on 4.5!
  157. Cam sensor replacement?
  158. Changed Oil Pan Gasket, Still Leaking (4.1)
  159. Where on the Web can I Find AC Delco Spark Plugs Cheap
  160. good compression
  161. Change spark PLugs
  162. 93 Sedan 4.9 F32, archives no help
  163. Fastest 4.9 Ever?
  164. 93 Deville Experts Please e26 239 e47 e97 e98 f32 stalls
  165. I Don't Even Know Where To Start
  166. looking for opinions on best oil/synthetic to use in a 4.1
  167. Is There a good quick fix for oil consumption?
  168. Getting a Attitude Again-missing
  169. Oil Filter Capacity?
  170. Rpm/idle Problems
  171. Gas milage back, more power, more smooth..
  172. Starts hard when it gets hot
  173. 90 Deville code help
  174. Check Fuel Pump Amps draw ? Bob ?
  175. Ht4100 Backfires Out Of Fuel Injection
  176. Grounds Anyone?
  177. Bbob...Whats the difference!?!
  178. what kinda maintenance should i do
  179. Weird 4.9 noise (not in archives)
  180. Engine Idles 10 Seconds AFTER Ignition Shut-Off!!
  181. Whats The AVG MPG Readout for this forum
  182. Finally. . .Solved Intake Backfire
  183. Engine Oil Questions - Bboby
  184. 85 Eldorado 4.1 help!!
  185. Best way to clean my throttle body?
  186. 4.9 codes
  187. 4100 D F I injector problems... looking for solutions
  188. Rough running 92 Eldo
  189. Which models come with the 4.9 V8?
  190. throwing my belt off
  191. What water??
  192. Rough Idle, 87 4.1 Eldorado
  193. problem while coasting
  194. 4.5L Valve Pinging / Clattering
  195. HT 4100 Replacement Source?
  196. isc motor question
  197. plug wires??
  198. Oxygen Sensor Broke?
  199. 1990 4.5l air system problem
  200. Oil leak
  201. idle rpm
  202. Car has no spark
  203. And Yet Another ISC Motor Question
  204. Info on GM Goodwrench replacement engine, HT4100
  205. Best way to flush system (84 HT4100 SDV)
  206. 94 deville questions
  207. Knocking in the 4.9
  208. Took a Vid in my 91 Deville
  209. What kind of Exhaust systems do the 84 SDV 4.1Liter motors like to breath through?
  210. 1990 Deville won't start HELP
  211. Cleaning and tune up junk on an 88 4.5L deville
  212. What The Hell Is That Thing!?!?!?!
  213. does ECU prevent engine braking
  214. 4.9 oil pump in 4.5?
  215. WHAT THE **** IS EVERYONE's FAVORITE MUFFLER/CAT Pipe SETUP?
  216. Bad ECU?(BBOB)
  217. How much booooooooost PSI can these 4.1's take? What gives in under pressure?
  218. used E C M ... from junk yard
  219. HELP!! 91 Eldo stalling problem
  220. Fuel Injector Replacement
  221. Is single 3" exhaust too big for a 4.1L @ 200 HP?
  222. 84 SDV RWD 4.1 Intake gasket
  223. GM Reliability Testing?
  224. coolant temperature
  225. remove power steering pulley
  226. 84 Eldorado 4.1 V8 (HT4100) "E" engine, M57 tranny, Noise from lower end
  227. 4.1 wiring from distributor to plugs HELP ASAP
  228. anyone know????
  229. Can A 4.1 Trans be Used in a Long?...
  230. Newbie needs help with 87 seville 4.1L
  231. Fuel pressure
  232. Dangers of flsuhing HT4100 with motor Flush and Supertech oil.
  233. injector duty cycle
  234. Knocking/Rattling From Engine
  235. BARO on 4.9?
  236. torque convertors for teh 4t60
  237. Change of Plans! I'm not supercharging anything...
  238. HT4100 EGR schematics needed to figure out smog issue, BAD F'ING NEWS
  239. 4.5 liter misfiring on acceleration, rough idle
  240. Slow Battery Drain
  241. 83 coupe 4100 ( 4.1) injector problems
  242. CAN you change oil filter withOUT draining oil pan?
  243. Oil Pressure Light just came on - 4.1 V-8!
  244. time for a tune up.. whats involved.
  245. 90 deville water pump?
  246. 91' deville
  247. What's the most universal oil filter wrench you have used?
  248. Why doesn't an '84 DeVille F'ING show up on most of the online catalogs?
  249. Aftermarket Cat
  250. Is the exhaust layout identical per the 1983 and 1984 DeVille 4.1 V8