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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. Is my EGR valave toast?
  2. 82 HT4100 Hearse Fuel System Codes
  3. Question on use of Rotella 15W-40
  4. ISC Motor question
  5. I need a quick answer
  6. Trans Problem?
  7. Cylinder Pressure Test Question???????
  8. 5 liter fuel injectors in a 4.9 project!
  9. 1990 sedan deville isc crap =(
  10. 3/8"-ish metal line off of throttle body runs where... ..?
  11. Rust in my cooling system, PLEASE HELP!
  12. Im Having Problems With My 86 Cadillac
  13. Digital Fuel Injection vs Crossfire Injection
  14. Help with the codes please!!
  15. In search of a new/rebuilt vacuum pump...
  16. broke water pump on my 88!
  17. Video of my 4.9 5spd in Action.
  18. E67!!!!!! how do i fix
  19. 91 Eldorado No Crank B334 code system problem
  20. Engine RPM.... is this normal?
  21. head gasket, intake gasket or what?
  22. 92 STS Engine Trouble
  23. High Idle. ISC? Need Advice!!!!
  24. Cooling fan fault
  25. Curious Fuel Pump Behavior
  26. Diagnostic Mode
  27. 89 deville stumble/miss on acceleration
  28. 1990 fleetwood won't run right - help
  29. exhaust ideas
  30. '90 DeVille has high NOX at low speed, failed smog. Some help needed.
  31. Noise at EGR conditions
  32. What is this?????
  33. Squealing under hood when cold
  34. Got rusty tubes?
  35. ??? ???E30 isc code??? ???
  36. Iron heads
  37. Are Head Bolts T.t.y Or Not (conflicting Answers)???????
  38. 91 Seville Overheat
  39. Amsoil test results
  40. 4.9 or northstar?? which has less problems??
  41. Bad Map on 91 Deville?
  42. What do i coat the head bolts with?
  43. Recommended sealant for water pump gasket on 91 deville
  44. ecm replacement
  45. Doing My 4.9 Head Gasket Looking for Advice on Parts
  46. Whats the brown stuff on my valves?
  47. overheating, now power, 83 coupe deville ht4100
  48. '92 Eldo Problems
  49. 1984 Cadillac - 4100 firing order and distributor rotation
  50. engine swap 4100 to 305 chevy
  51. Stripped Head Bolt Hole Where Do I Get Helicoil?
  52. 4.9 Extremely rough running issue
  53. isc motor re-learn
  54. 4.5 L tranny bolt pattern
  55. Performance transmission rebuild...
  56. 15W40 delco with GM oil supplement
  57. HT4100 Check In
  58. TRANS ID'ing
  59. Rwd/fwd Ht4100
  60. Squeeking Noise!
  61. Poor mpg on 93 sedandeville
  62. Why is my caddy over heating ?
  63. 1984 Throttle body need help, please.
  64. Post your average MPG
  65. Cleaning the throttle body plates!
  66. Running fuel injector cleaner through your gas tank
  67. 1985 Seville 4100
  68. F48
  69. Ping Ping Go Away!!!
  70. Do your own oil changes.
  71. Where to get Exhaust Manifold Studs
  72. Cadillac 4.9 Head Gasket Photos
  73. Helicoil vs Timesert on non N* (4.1, 4.5, 4.9)
  74. 4.1 codes
  75. Cold Air Intake?
  76. First Car, 4.9 Eldorado. Performance Upgrades HELP? (car-noob)
  77. 4100 Flowmaster 80 series VIDEOS
  78. Now im getting worried!
  79. Still having problems on 93 sedandeville
  80. Deisel noise around 2000 rpm's
  81. PCM codes
  82. Adjusting the timing
  83. ECM says my MAT sensor is bad.
  84. Coolant System
  85. 4100 transmission
  86. 4.9 performance
  87. Changing Oil To Synthetic?
  88. problem solved
  89. 4.9 Running Rough...
  90. Recommended Spark Plugs
  91. 4.9 EGR Removal???
  92. 1984 eldo some new problems
  93. OLDS 350 swap
  94. Hey Guys, Long time no chat, and need some input on a non input vss signal. Blew.....
  95. 91 4.9 Runs Rich and Gas Mileage Question
  96. spudder of some sort
  97. isc/driveability
  98. Rough runing, missing?
  99. Cone Filter & Cold Air Intake
  100. 1990 deville hard stall on idle
  101. 90 Coupe Deville engine problems
  102. hesitation and backfire 4100
  103. bad coolant leak: deville 4.5
  104. Coolant Leak
  105. 94 Deville, odd noise and stalling now. Pics attached.
  106. HT4900 (4.9) Exhaust Manifold Interchangeability
  107. 1993 Seville w/ 4.9L P041 Code
  108. Mufflers Bottom Line?
  109. Cooling fans/AC problem
  110. 92 Deville throwing MAP codes, heats up and conks out.
  111. 91 Deville 4.9 misses when hot outside
  112. 1990 fleetwood won't run right - help
  113. bad coolant leak: deville 4.5
  114. Electrical problem + codes
  115. 90 deville misfire
  116. 87 SDV E30 code
  117. Simple question
  118. Accel Wires
  119. 4.9 Eldorado Plugs/Wires install question
  120. 90 deville backfiring and running rough?
  121. No fuel pressure when ignition on, engine off
  122. How to check timing on an '85 Seville?
  123. Green plug?
  124. A Little help guys, please
  125. Charge Battery Light On (No Codes) !!
  126. Brake light problem.
  127. STOP ENGINE TEMP light problem.
  128. hmm, how do I get to that A/C compressor clutch?
  129. Want your ISC problems solved? Look here...
  130. A/C Hose Insulation Source
  131. Dead Cylinder - OH NOOOOOO!!!!
  132. O2S Help Please!
  133. Changing TPS on 1993 Eldo 4.9
  134. 92' Deville Alternator/power Problem
  135. 92 deville egr tubes ??
  136. My car's 'puter done gone got brokeded (92 Eldo 4.9)
  137. motor rattle
  138. 91 deville fuel injectors......
  139. '92 deVille..surging, stuttering, stalling???
  140. When to replace O2 sensor?
  141. 4.9 Bearing Thump--Who's Got It?
  142. Trouble clearing codes
  143. Sound like the egr to you guys?
  144. ? easy way to remove 4.9 @ self serv yard?
  145. 88 deville broke down need help
  146. 1990 deville 4.5 trouble code air management fault?
  147. A starting we will go...
  148. STP Fuel Injector Cleaner--it works!
  149. Trying to beat the heat....
  150. 223-232f
  151. Trouble Code E48 "EGR System Problem"....what exactly is it.
  152. PCM Programming for 4.5L V8?
  153. 1994 Sedan deville 4.9L Stalls/dies well driving
  154. Great, now I have MORE trouble codes!! E91 and E98
  155. 1990 deville hesitates
  156. 91 Sedan Deville Gas Mileage ...
  157. I have a question, someone please explain.
  158. Not a new problem
  159. ignition problems..
  160. 2002 DeVille DTS maintenance
  161. Aluminum Heads?
  162. plug stuck in head
  163. Life expectancy for 4.9 and 4T60E
  164. 4.5 intake gasket replacement
  165. Do I have to use a new A/C comp. or can I use a reman?
  166. computer accuracy
  167. No spark on '90 4.5 Seville
  168. clickinggg....
  169. Fuel Injector Replacement Tips
  170. HT4100 85 Eldo. Header Issue
  171. Simple rotor/distib cap question
  172. Question having to do with the 4.9
  173. What should engine timing be when not in Timing Mode (25 degree BTDC?)
  174. Need help 91 Deville
  175. Results of my Emissions Test
  176. What do I need to know about the HT4100 Engine?
  177. 4.9 coolant flush and fill procedure!
  178. 93 DeVille Idle Problem
  179. Help me! What is it?
  180. '85 Seville 4.1L engine missing after tune-up.
  181. error codes
  182. New Shell Rotella T with triple protection
  183. 88 DeVille fan continues to run after I turn it off
  184. Reman. Engine/Trans. What's the best company?
  185. 85 eldo ht4100 backfire, miss, stall
  186. 4.5 intake manifold on 87 4.1?
  187. Just done the head gasket, think i may have messed it, help.
  188. what did i blow up? pics
  189. 1994 Sedan deville 4.9L Stalls Well Driving Part 2
  190. 4.9 changes by year??
  191. 4.9 exhaust manifold crack, common?
  192. Take a look at this.
  193. engine system fault E046
  194. turn your 4.9 into a performance engine
  195. Very poor MPG 1992 Deville ?? HELP!!??!!
  196. Cylinder head removal
  197. 4100 to LT1 swap 83 Coupe Deville
  198. remaned 4.1/4.5 short block
  199. Valve Adjustment 4.9 Engine
  200. 1989 Fleetwood Idle Speed Motor
  201. 1989 4.5 Idle Speed Motor
  202. no start after warm engine
  203. Boiling coolant, fans not running, ...
  204. 89 Fleetword code (30) ISC Circuit
  205. 89 4.5 TPS installations
  206. 1987 SDV 4.1 L V-8 Available
  207. ht 4100 Hesitation
  208. Does twitchy tach mean misfire?
  209. 92 4.9 flat cam?
  210. Fuel Mileage vs. Data Center
  211. 4.5 Vs. 4.9
  212. AHHH HELP!!! Keep overheating
  213. Fan Runs all the time on 4.9, engine runs real cold
  214. 4.9 to a 5.0?
  215. 94 Deville 4.9 switching complete sending/fuel pumps
  216. 4.9 Potential? (Split from "4.9 to a 5.0?")
  217. 85 Sedan Deville Stalls after 20 Miles
  218. 1994 Deville 4.9 spark knock
  219. Please Help!!! Rough running 4.9 , Help!!
  220. 1994 Deville 4.9 Idler pulleys
  221. 92 STS error code A048 what does that mean?
  222. 4.9 Injector Replacement Questions
  223. Starter solenoid replacement
  224. 1991 DeVille Speedometer/Transmission Trouble.
  225. 87 deville 4100 shift problems
  226. 4100 Mpg
  227. TPS problem?
  228. Question about spark plugs!
  229. 1985 FWD HT4100 Running rough
  230. 1988 Eldorado 4.5
  231. Getting ready for water pump removal
  232. 4.5 --> 4.9
  233. 1994 cadillac deville engine knocks when warm
  234. Strange ISC
  235. Early vs. Late 1985 FWD 4100
  236. what is up with my car
  237. i need a 4t60e guru; i am hating mine
  238. Odd brief buzzing noise from undercarriage
  239. 1985 Seville harsh shifting tranny
  240. 4.9 runs rough black exhaust from tail pipe
  241. The once a year survival kit for the 4.X series
  242. Hey Guys long time no chat, and long time not wanting to start either.
  243. That Funky Emissions Tubing
  244. 1992 Eldo
  245. Oil Analysis: Proof is in the results
  246. Battery/ALternator area cracking noise?
  247. Copper Gaskets?
  248. Code E30 on 85 Deville and Vacuum Pumps
  249. Bars Leaks Head Gasket Repair
  250. Cooling Fan Module--Where can I get one?