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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. Cylinder head removal
  2. Very poor MPG 1992 Deville ?? HELP!!??!!
  3. turn your 4.9 into a performance engine
  4. engine system fault E046
  5. Take a look at this.
  6. 4.9 exhaust manifold crack, common?
  7. 4.9 changes by year??
  8. 1994 Sedan deville 4.9L Stalls Well Driving Part 2
  9. what did i blow up? pics
  10. Just done the head gasket, think i may have messed it, help.
  11. 4.5 intake manifold on 87 4.1?
  12. 85 eldo ht4100 backfire, miss, stall
  13. Reman. Engine/Trans. What's the best company?
  14. 88 DeVille fan continues to run after I turn it off
  15. New Shell Rotella T with triple protection
  16. error codes
  17. '85 Seville 4.1L engine missing after tune-up.
  18. Help me! What is it?
  19. 93 DeVille Idle Problem
  20. 4.9 coolant flush and fill procedure!
  21. What do I need to know about the HT4100 Engine?
  22. Results of my Emissions Test
  23. Need help 91 Deville
  24. What should engine timing be when not in Timing Mode (25 degree BTDC?)
  25. Question having to do with the 4.9
  26. Simple rotor/distib cap question
  27. HT4100 85 Eldo. Header Issue
  28. Fuel Injector Replacement Tips
  29. clickinggg....
  30. No spark on '90 4.5 Seville
  31. computer accuracy
  32. Do I have to use a new A/C comp. or can I use a reman?
  33. 4.5 intake gasket replacement
  34. Life expectancy for 4.9 and 4T60E
  35. plug stuck in head
  36. Aluminum Heads?
  37. 2002 DeVille DTS maintenance
  38. ignition problems..
  39. Not a new problem
  40. I have a question, someone please explain.
  41. 91 Sedan Deville Gas Mileage ...
  42. 1990 deville hesitates
  43. Great, now I have MORE trouble codes!! E91 and E98
  44. 1994 Sedan deville 4.9L Stalls/dies well driving
  45. PCM Programming for 4.5L V8?
  46. Trouble Code E48 "EGR System Problem"....what exactly is it.
  47. 223-232f
  48. Trying to beat the heat....
  49. STP Fuel Injector Cleaner--it works!
  50. A starting we will go...
  51. 1990 deville 4.5 trouble code air management fault?
  52. 88 deville broke down need help
  53. ? easy way to remove 4.9 @ self serv yard?
  54. Sound like the egr to you guys?
  55. Trouble clearing codes
  56. 4.9 Bearing Thump--Who's Got It?
  57. When to replace O2 sensor?
  58. '92 deVille..surging, stuttering, stalling???
  59. 91 deville fuel injectors......
  60. motor rattle
  61. My car's 'puter done gone got brokeded (92 Eldo 4.9)
  62. 92 deville egr tubes ??
  63. 92' Deville Alternator/power Problem
  64. Changing TPS on 1993 Eldo 4.9
  65. O2S Help Please!
  66. Dead Cylinder - OH NOOOOOO!!!!
  67. A/C Hose Insulation Source
  68. Want your ISC problems solved? Look here...
  69. hmm, how do I get to that A/C compressor clutch?
  70. STOP ENGINE TEMP light problem.
  71. Brake light problem.
  72. Charge Battery Light On (No Codes) !!
  73. A Little help guys, please
  74. Green plug?
  75. How to check timing on an '85 Seville?
  76. No fuel pressure when ignition on, engine off
  77. 90 deville backfiring and running rough?
  78. 4.9 Eldorado Plugs/Wires install question
  79. Accel Wires
  80. Simple question
  81. 87 SDV E30 code
  82. 90 deville misfire
  83. Electrical problem + codes
  84. bad coolant leak: deville 4.5
  85. 1990 fleetwood won't run right - help
  86. 91 Deville 4.9 misses when hot outside
  87. 92 Deville throwing MAP codes, heats up and conks out.
  88. Cooling fans/AC problem
  89. Mufflers Bottom Line?
  90. 1993 Seville w/ 4.9L P041 Code
  91. HT4900 (4.9) Exhaust Manifold Interchangeability
  92. 94 Deville, odd noise and stalling now. Pics attached.
  93. Coolant Leak
  94. bad coolant leak: deville 4.5
  95. hesitation and backfire 4100
  96. 90 Coupe Deville engine problems
  97. 1990 deville hard stall on idle
  98. Cone Filter & Cold Air Intake
  99. Rough runing, missing?
  100. isc/driveability
  101. spudder of some sort
  102. 91 4.9 Runs Rich and Gas Mileage Question
  103. Hey Guys, Long time no chat, and need some input on a non input vss signal. Blew.....
  104. OLDS 350 swap
  105. 1984 eldo some new problems
  106. 4.9 EGR Removal???
  107. Recommended Spark Plugs
  108. 4.9 Running Rough...
  109. problem solved
  110. Changing Oil To Synthetic?
  111. 4.9 performance
  112. 4100 transmission
  113. Coolant System
  114. ECM says my MAT sensor is bad.
  115. Adjusting the timing
  116. PCM codes
  117. Deisel noise around 2000 rpm's
  118. Still having problems on 93 sedandeville
  119. Now im getting worried!
  120. 4100 Flowmaster 80 series VIDEOS
  121. First Car, 4.9 Eldorado. Performance Upgrades HELP? (car-noob)
  122. Cold Air Intake?
  123. 4.1 codes
  124. Helicoil vs Timesert on non N* (4.1, 4.5, 4.9)
  125. Cadillac 4.9 Head Gasket Photos
  126. Where to get Exhaust Manifold Studs
  127. Do your own oil changes.
  128. Ping Ping Go Away!!!
  129. F48
  130. 1985 Seville 4100
  131. Running fuel injector cleaner through your gas tank
  132. Cleaning the throttle body plates!
  133. Post your average MPG
  134. 1984 Throttle body need help, please.
  135. Why is my caddy over heating ?
  136. Poor mpg on 93 sedandeville
  137. Squeeking Noise!
  138. Rwd/fwd Ht4100
  139. TRANS ID'ing
  140. HT4100 Check In
  141. 15W40 delco with GM oil supplement
  142. Performance transmission rebuild...
  143. 4.5 L tranny bolt pattern
  144. isc motor re-learn
  145. 4.9 Extremely rough running issue
  146. Stripped Head Bolt Hole Where Do I Get Helicoil?
  147. engine swap 4100 to 305 chevy
  148. 1984 Cadillac - 4100 firing order and distributor rotation
  149. '92 Eldo Problems
  150. overheating, now power, 83 coupe deville ht4100
  151. Whats the brown stuff on my valves?
  152. Doing My 4.9 Head Gasket Looking for Advice on Parts
  153. ecm replacement
  154. Recommended sealant for water pump gasket on 91 deville
  155. What do i coat the head bolts with?
  156. Bad Map on 91 Deville?
  157. 4.9 or northstar?? which has less problems??
  158. Amsoil test results
  159. 91 Seville Overheat
  160. Are Head Bolts T.t.y Or Not (conflicting Answers)???????
  161. Iron heads
  162. ??? ???E30 isc code??? ???
  163. Got rusty tubes?
  164. Squealing under hood when cold
  165. What is this?????
  166. Noise at EGR conditions
  167. '90 DeVille has high NOX at low speed, failed smog. Some help needed.
  168. exhaust ideas
  169. 1990 fleetwood won't run right - help
  170. 89 deville stumble/miss on acceleration
  171. Diagnostic Mode
  172. Curious Fuel Pump Behavior
  173. Cooling fan fault
  174. High Idle. ISC? Need Advice!!!!
  175. 92 STS Engine Trouble
  176. head gasket, intake gasket or what?
  177. Engine RPM.... is this normal?
  178. 91 Eldorado No Crank B334 code system problem
  179. E67!!!!!! how do i fix
  180. Video of my 4.9 5spd in Action.
  181. broke water pump on my 88!
  182. In search of a new/rebuilt vacuum pump...
  183. Help with the codes please!!
  184. Digital Fuel Injection vs Crossfire Injection
  185. Im Having Problems With My 86 Cadillac
  186. Rust in my cooling system, PLEASE HELP!
  187. 3/8"-ish metal line off of throttle body runs where... ..?
  188. 1990 sedan deville isc crap =(
  189. 5 liter fuel injectors in a 4.9 project!
  190. Cylinder Pressure Test Question???????
  191. Trans Problem?
  192. I need a quick answer
  193. ISC Motor question
  194. Question on use of Rotella 15W-40
  195. 82 HT4100 Hearse Fuel System Codes
  196. Is my EGR valave toast?
  197. just died
  198. Newbie 4100 owner advice
  199. Cleaning under hood - recommendations?
  200. It WON'T slow down...
  201. Spark plugs and spark knock
  202. Where is the control valve assembly for the transmission??
  203. Does the ISC motor affect the tranny shifting/downshifting???
  204. Ethanol in your Caddy....?!
  205. Any Ideas? 93 Deville Stalling
  206. Camshaft position sensor
  207. What's wrong with the tranny?
  208. 1990 Sedan Deville - Any Help is Appreciated
  209. Changing Water Pump on 95 Deville
  210. engine ping
  211. hesitation,back fire and bad Idle 4.9
  212. 4.9 performance exhaust
  213. Any Neat Tricks Replacing Lh Head Gasket???
  214. real cold air intake(no short ram)4.9
  215. Throttle Body 1984 HT4100
  216. 4.9 exploding mufflers
  217. Northstar engine builders in So Cal?
  218. A/C Compressor Only Works at High RPM?
  219. How often do you have to calibrate your TPS?
  220. Its not the fuel pump.
  221. Swapping 4.9 to 4.6N*
  222. 4100 coolant loss #3 cylinder
  223. will 4.5L heads bolt up to a 4.1L
  224. Engine Miss...driving me mad...
  225. Compression ratios?
  226. They see me coming OR So they think
  227. They see me coming OR So they think
  228. exhaust leak
  229. Changing Thermostat on 88 Coupe Deville
  230. HT4100 flooding out badly. Code 15,20,52 ?
  231. GM Top Engine Cleaner
  232. Coolant temp gets up around 230 some times
  233. Toasted fuel pump?
  234. What is that tube for?
  235. Finally bought some things for the car !
  236. 4.9L What the Hell is this? ...
  237. Is this converter alright?
  238. Professional injector cleaning?
  239. Is my fuel pressure low???? 93 Deville
  240. E62 Cruise control vacum solenoid error code
  241. I am going to make a cut out
  242. Problem adding a cutout to '90 Seville exhaust system,
  243. Flawed logic or a..
  244. transmission bolt up from 4.5L to 4.1L HT4100
  245. Does Anyone Have A Step By Step Guide To Adjusting The Tps?
  246. All Show And No Go
  247. Coolant issues must be contagious
  248. Coolant gushed out on highway, engine rattles
  249. Yet another exhaust theory question.
  250. 4.5 sounds real good with no cat