: HT4100 4.1, 4.5, 4.9



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  1. OK the 4.9 ECU mods thread ,lets go!
  2. Need information on an engine rebuild
  3. how do i use the codes
  4. intake question
  5. advanced timing
  6. Another one knockin
  7. egr valve
  8. 4.9 engine idle speed...
  9. Blown Head Gasket maybe?????
  10. Ht4100 Flowmaster Sound Clip!!!!!!!
  11. Lucas oil treatment?
  12. Piston Rings
  13. Startup problem
  14. Dumb Tool Question?
  15. Intake on a Deville...
  16. now what ?
  17. EDAHALL! How do i post sound clips of my FLOWMASTER 40 SERIES delta with the HT4100
  18. Delco vs. Others
  19. Needle in a haystack E53
  20. Will a HT4100 go into an 88 Deville?
  21. A little oil here and a Little oil there
  22. How do you advance timing?
  23. 4.9L '92 Knocking...or missing, help!
  24. Ticking
  25. Rebuilding an HT4100
  26. Engine Swap
  27. Timing Questions...
  28. '90 DeVille 4.5L "hunts" for curb idle
  29. What is most likely source of oil leak?
  30. fuel system??
  31. collectors,bbob anyone,long term storage
  32. Trouble with O2 Sensor
  33. Oil Light
  34. Engine Oil Additive to stop leaks?!?
  35. Got a Reply! on HT4100 TO 4500 Conversion!
  36. Performance Mufflers for 4.9??
  37. Mobil 1 Extended Performance? BBob!
  38. Code 33 Help!!!!
  39. Engine Idle and "almost" stalling problems
  40. Boosting HT4100 Performance
  41. Benefit of using higher mileage vehicle oil?
  42. Exhaust Condensation
  43. bad throttle response
  44. timing newbbb
  45. Does it ever Stop!!!Tuned up and Tuned out
  46. Engine miss at highway speeds.
  47. Mind boggler engine noise
  48. 91 4.9 Excessive Fuel Consumption
  49. 4.5 tbi- performance stuff??
  50. new to me 85 coupe Deville
  51. HELP! 1990 seville shifts to 3rd and freewheels
  52. Engine reliability?
  53. Rough Idle and Missing...
  54. 1992 DeVille Misfiring, or something.
  55. Bad computer? Maybe
  56. air pump to fan to crunk v belt
  57. Can 4.1 be replaced with 305 fuel Injected?
  58. AMAZING fix for hesitation, bad milage
  59. Issues with vacuum lines, Battery light, all in this issue of the 2dfx PMS Thread!
  60. coolant temp light???
  61. 4.9 Fuel Filter clogging...
  62. cadillac eldorado 1991 4.9
  63. ISC Unpluged , wont idle
  64. Loose EGR tube
  65. HT4100 swap. 4.5 or 4.9?
  66. Typical Driveability Problem - 90 Deville
  67. Engine Fire!!! Why Me???
  68. dieseling HT4100....
  69. '82 Eldo Engine dying out, Backfiring through throttle body--Bbobynski please help!!!
  70. intermittent problemn
  71. Sparkplugs
  72. Whats The Best Oil for the HT4100???
  73. Need Help
  74. car running rough now
  75. my baby is sick again , why ??????
  76. Eldorado 4.1 motor problem
  77. Minor tune up
  78. '82 vs. '83 Eldo ECM--ARE THEY INTERCHANGEABLE?!? HELP!!!!
  79. Stupid question for smart people.
  80. Will 4.5 exhaust manifolds fit the HT4100?
  81. '85 eldo 4.1 head leak
  82. OIL Leak??????
  83. 95 deville temp.
  84. 3 questions for all you experts.
  85. 1986 4.1 rebuiled upgrades for more reliability.
  86. Idle Relearn Debate
  87. Fuel Filter Location - 85 Deville (Front Wheel)
  88. HT4100 FLOWMASTER 40series delta flow sound clip
  89. 85 Deville 4100 - Problems Galore
  90. Change Oil Light
  91. compatibility part 2
  92. Please REad need answer ASAP
  93. READ THIS ONE! \/\/ high idle
  94. 90 Deville-surging, missing, after it is warmed up
  95. ECM killing the Injectors?
  96. Someone tell me what a 'transaxle range switch' is!
  97. Electrical problem. Car won't start.
  98. my baby is sick and wont get better :(
  99. Thinking about replacing the 4.9L
  100. Accel Fuel Injectors
  101. I have 2 questions.
  102. Subtle rattling noise possibly from transmission
  103. Redline/shiftpoints for 4.5
  104. two questions pedal and ...
  105. valve spring rates
  106. I wanna know as many 0-60 times as possible!!
  107. Performance Parts for 4.9
  108. 92 Sedan Deville
  109. Car runs hot during long trips
  110. Radiator woes...
  111. How Many of You With Dead Injectors??
  112. 4.9 /Northstar
  113. Coolant shelf life?? No good after 2 years?
  114. compatibility???
  115. Exhaust Options? (photos)
  116. engine oil supplement ?
  117. 4.5 Engine: one dead others dying
  118. air intake mod?
  119. 4100 dual exhaust anyone????
  120. 93 deville heating problem
  121. E98 Isc?
  122. well
  123. High Mileage 4.9L Problems (desperate help needed)
  124. Missing Oil Pump O-ring On Ht4100
  125. 4.9l Deville e41 troubleshooting
  126. ISC RPM out of Range (P030)
  127. Clicking sound from valve covers?
  128. Oh no! trannys slipping
  129. 4.9L Drain Plug Leaking after Coolant Flush -- Help!
  130. 4.9 in rwd configuration?
  131. Fuel Pressure Regulator location?
  132. 4.9L engine low power
  133. here is a good one
  134. rocker arm pivot support
  135. new engine
  136. valve lifter?
  137. please dont be head gasket!!
  138. Starter Removal
  139. module needs ground?
  140. 4.1 vs 4.9
  141. well damn
  142. 4.9 Misfire
  143. P012 bad hall sensor or pick up coil?
  144. Rebuilt Ht4100 With Less Power
  145. Coolant drain locations for a 4.9 (93 SDV)
  146. Metal hose running into side of cat, what is it?
  147. Pulled plugs and compression test *pics*
  148. rip of cat conv and egr??
  149. 4100 coolant capacity
  150. 4.5L A.I.R. Error Code
  151. Increasing Horsepower in 1992 Deville
  152. 4100 Help!!!
  153. Just craps out when I give it gas
  154. He said my cams were out of time....
  155. 4.9 bearing thump
  156. Final Choice: Dynomax SuperTurbos VS. Summit Turbos
  157. Knocking when I give gas to the engine Any one know?!!!
  158. 1991 Cadillac Deville Misfiring
  159. 4.1 engine weight and application ?
  160. Timing advance and still run on MidGrade??
  161. 1990 Eldorado water pump removal help
  162. junkyard ht4100
  163. 1989 4.5L no start when cold. At witts end
  164. Engine runs poorly
  165. 4.5 Engine Woes
  166. Do it right once ....Never see it again
  167. 84Eldo 4.1 won't start
  168. 4.9 Died Again
  169. 4.9L Volcano!!!!
  170. Now I'm getting code 38! What gives?
  171. '84 4.1 running VERY rich, PLEASE HELP!!!!
  172. E30 on Fleetwood 1990
  173. Need Some Help
  174. What's this coming or going out of my cat. converter?
  175. Draining ALL the coolant!!
  176. What's the name of the device (?pump?) under on my 86 deville
  177. car running rich messing up oxygen sensor!
  178. no oil pressure
  179. 90 4.5 Runs Great till it warms up then brakes up.
  180. 4100 tuneing
  181. Engine has a hard time running
  182. i had it out with the cooling system today
  183. temperature erratic
  184. 95 4.9L #7 Cylinder dead, Injector?
  185. 4.9 Cylinder head removal questions
  186. Coolant change.Time or mileage dependant?
  187. Anti-Freeze Coming out of Heater?(fogging up windows)
  188. i changed everything almost ugghh
  189. 4.9L build-up
  190. stuck valve?
  191. I Need a bolt can you help me?
  192. update on my '82
  193. E39 Vcc
  194. WTF is going on!!!(engine runnin crazy!)
  195. 4.1 Low compression
  196. OBD code
  197. popping from carb..
  198. 1984 Having Coooold Start Problems.
  199. won't start when hot
  200. 4100 Heads For Sale
  201. [B][U]4.9 L Performance, 10" Round Air Cleaner[/B][/U]
  202. Head Gaskets or Complete Valve Job
  203. 4100 head bolts
  204. Now this is really weird to me!
  205. 84' seville timing
  206. 4.9 no longer starts
  207. ht4100 loosing power and e codes
  208. 4.1 running rich
  209. Car surges when accelerating
  210. 4.9 HEI ignition
  211. 93 eldorado vs. 92 coupe deville
  212. 4.5 Pinging
  213. Air Mix Door problem code F40
  214. Caddi still not starting
  215. 95 Deville 4.9, Low oil pressure warning
  216. im so cold
  217. Fuel lines
  218. '93 DeVille Gas Mileage Questions
  219. Question for Kcnewell
  220. my '85 FWB died on the interstate...fuel pump?
  221. throttle body cleaning????
  222. another sickening creation of mine!
  223. Coolant supplement
  224. backfiring in park
  225. 4.5 oil pan-bolts gone pan stays on
  226. Crazy overheating problem
  227. Weird Problem
  228. Need to find honest and expert mechanic in Saint Louis Help
  229. 84 Eldorado engine overheating problem
  230. Resurection of a '94 4.9--Advice please!
  231. Jr Shift kit 1-2 rpm shift? but my rebuilt transmission seems great :)
  232. 4.9 low oil pressure warning after head gaskets
  233. Backfiring from the start
  234. I really need help on this.... engine overall performs better, gas millage bad...
  235. 4.9l Engine Knocks when Started
  236. MYSTERY 94'deville water pump
  237. Rattling Rattling Rattling !!
  238. 89 Fleetwood no problems with overheating then 3 days ago leaking antifreeze......
  239. 90-92 350 TBI into 80's Fleetwood Brougham ?
  240. Possible northstar upgrade?
  241. Ignition module failing?
  242. plug wire confusion
  243. please help 4100 problem
  244. advice
  245. 4.5 no heat
  246. 4.1 Runnin a Little Hot at Idle
  247. I hope it's not too late!
  248. 4.1 Cad. Fleetwood Brougham [Tranny Question]
  249. Just installed new M.A.P. sensor now car doesn't even start!
  250. Help With 4100