: HT4100 4.1, 4.5, 4.9



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  1. Help with and '89 Deville w/4.5L
  2. Tune-up questions, spark plugs
  3. Mystery Grind in Transmission, Engine, Where?
  4. 85 Deville 4100 Driveability
  5. I dread turning this car off!
  6. 4.9 instead of 4.5??
  7. 88 cdv
  8. Should I buy a car with a 4.1 L Engine?
  9. Ok ive given up on this engine.
  10. Oil test shows coolant contamination in 4.9!
  11. Need 2 things please...
  12. honest mpg of 4.9 city driving survey
  13. transmission bump on downshift
  14. ISC motor 1993 Deville
  15. Think i messed something up
  16. A little help needed identifying a loose connector
  17. Intermittent ISC? TPS? Problem still
  18. 4.9 STILL runs rough sets codes
  19. TPS Question
  20. Maitenance Questions, 4.9L 1993 Deville
  21. loud rumble now when stopping now
  22. 4.1L Oil Cooler path through Radiator
  23. Can overheating a 4.9L once damage your headgaskets?
  24. 4.9L: original red/blue A/C valve caps?
  25. Better intake for the 4.1L
  26. Idle is too high now
  27. Slight fuel leak at TBI
  28. Check Vehicle Light
  29. Setting Timing on '84 HT4100 4.1L
  30. tuning Questions for a 93 deville
  31. gas leak from cannister (85 Eldorado)
  32. High startup idle?
  33. Car wont shift on its own but shifts manually
  34. Coolant Supplement?
  35. Calling all 4.5 PFI and 4.9 PFI Owners
  36. Think the engine/tranny would last?
  37. Rocker Arm Support Part Problem-HELP?
  38. Problems w/ 4.9
  39. HT4100 Misfire Question
  40. indexing spark plugs
  41. 4.5L L (front) Cracked Header
  42. Alternator Issues--Please Help!
  43. Another Isc Question?
  44. 4.1L.. What's the problem?
  45. Best way to bleed the cooling system?
  46. car runs too rich didnt pass smog
  47. ht4100 engine cleanup. how to?
  48. Why An Aluminum Block with Iron Heads?
  49. 1985 deville runs great but
  50. 85 Seville with 4.1 Engine: Buy or Run?
  51. Anyone change the valve cover gaskets?
  52. Horrendous gas mileage
  53. Failed smog test - high CO
  54. Looking f/a 4100 4.1?
  55. 85 Deville TV Cable Adjustment
  56. fuel injection??>??
  57. 4.9L seville/deville fastchips or superchips performance chip
  58. keeps going like the energizer bunny
  59. E055 OBD1 Code
  60. Air Filter Question
  61. Serevice engine soon
  62. 4.1/4100 Distributor Hold down- how to tighten???
  63. 4.9 litre plug wire access problem.
  64. Engine mount - Any unique replacements?
  65. 4.9 Squeaking at Idle
  66. The continuing saga of my tranny problems...please help!
  67. 86 Fleetwood engine swap
  68. What senses the RPM on HT4100 engines?
  69. Open Throttle Switch Signal E27
  70. 83 FWB Idle Problems
  71. Got a code do not know what or where to check
  72. weird SES and hard start problem
  73. Sputtering, loss of power when hot
  74. Your opinion of the 4.5L V8 in the 88 DeVille
  75. oil
  76. Tranny Slipping?
  77. part identification 4.9
  78. 1992 seville 4.9 fuel filter location
  79. Good old 83' Coupe Deville
  80. new cadillac seville owner coolant flush
  81. 1993 Deville power steering pump failure
  82. ECM software
  83. 130 mph in a 4.9!
  84. Frozen Pulley
  85. Ignition Module issue
  86. Removing EGR valve - 4100
  87. Bad alternator in 93 Deville, need help
  88. Restore Lubricants
  89. Bad Head Gasket 92 DeVille 4.9- Need opinion
  90. Throttle Position Sensor Misadjusted
  91. A.I.R. Pump 4.5l '89 Deville
  92. temp sensor
  93. Don't ask oil questions on this site.
  94. 1985 deville died
  95. where do i go from here
  96. Need Help On Two More Things
  97. serious help needed
  98. 1983 Caddy transmission
  99. Strange Timing Issues
  100. Mobil 1 10W30
  101. 1985 Deville with a 4100 and it will not crank
  102. 1985 Deville with a 4100 and it will not crank
  103. Code E48 diagnosis
  104. codes ???please help
  105. 4.5 Allante intake on 93 4.9 deville
  106. New Trouble Code
  107. 1989 Caddy Deville......
  108. Throttle Body Plate issue
  109. Code and Coolant Prob.
  110. Low oil pressure!
  111. Oil Cooler Lines Leaking
  112. 1989 Caddy Deville......help!!!
  113. Stallling at idle
  114. gas pedal
  115. 4.5 TBI rough idle
  116. 94 Deville has almost no power from start
  117. 84 eldo conv't - 70 weight oil - yes or no?
  118. E012,E053 Won't run
  119. 1990 Seville Timing chain?
  120. 4.9 groaning
  121. '84 Eldo Code 44
  122. HT-4500 Starting trouble
  123. Speedometer Sensor issue ?
  124. The Ultimate FWD Cadillac Engine Swap
  125. Sticky Gas Pedal...4.5L
  126. Underhood smoking... need help with a diagnosis
  127. Fixed EGR now MPG is lower
  128. engin and trany swap for an 85 coupe deville
  129. Favorite things about the 4.9?
  130. 86 EGR Valve
  131. 4.5 TBI smoking
  132. Fuel pump on 4.9 92 Deville
  133. Fleetwood/DeVille Speedometer
  134. 4.1 Knock?? Or Tap??
  135. 1990 deville 4.5 air pump noisy
  136. 4.5L TBI Grumbling
  137. HT4500 and 4900 series Performance
  138. 4.1L injector
  139. how to get more hp from a 4100
  140. Intermittent Lurch—91 DeVille 4.9
  141. MAP Problems
  142. Oil Level
  143. How to start when very cold (less than 0 F)
  144. Need Help Please
  145. Engine surges at slow speed
  146. Stop Engine, Low Oil Pressure
  147. 1988 Fleetwood 4.5 Distributor order
  148. 1985 Seville Power Steering Pulley bolt
  149. Installing oil pump in 4.9 engine.
  150. 1985 deville ht4100 jump start
  151. GM Top End Cleaner Has Been Discontinued
  152. Makes Me Happy!
  153. HT4100 Question
  154. HT 4100 knock, 83 Eldorado (I know, another thread on this)
  155. Makes me nervous!
  156. 4.9 E55 code. TPS?
  157. Thoughts on the 4.5
  158. power steering leakk
  159. The SEA FOAM experience thread.
  160. Oh just great, a collapsed lifter in #1 cylinder!!
  161. 94 4.9 bypass siezed A/C compressor
  162. 85 Deville Still Has Poor Performance
  163. Need exhaust manifolds 4.1 HT4100
  164. 93 Deville stalls after car warms up
  165. New Caddy Owner, Need Some Help
  166. Rattle Under Car
  167. What kind of ISC motor should i get?
  168. 84 eldorado fuse panel pictures?
  169. Crack in my Block
  170. 93 DeVille AC converter clutch bypass ???
  171. Cooling System - Water Pump Conditioner/Anti-Rust
  172. Stock Exhaust dimensions on 93 Devilles
  173. Campaign 95-C-72 (recall)
  174. fuel pressure????
  175. Just finished my 4.9 Water pump repair pics inside
  176. 4.9L Rear Oil Leak
  177. Quick question: Ignition Control Module
  178. Disaster
  179. EGR Valve
  180. 4.1 main bearing thump
  181. Tranny problems, E39!! Please help, dont want to rebuild...
  182. 95 Deville 4.9 need help
  183. OMG water pump problem!
  184. Bypass Catalytic Converter on 1993 Deville?
  185. Starter motor gone on 87 deville 4.1
  186. Need help 4.9 L Fuel Delivery problem
  187. 92 4.9 DeVille runs horrible, sets codes
  188. Roller Lifters On The 4.9?
  189. water pump change on 4.1ltr
  190. 93 deville
  191. 1993 Cadillac Seville: Please Help starting problem
  192. Bad coil?
  193. Rebuilding a tbi on 89 deville
  194. I Broke it
  195. 4.9 Surges After Hot Start
  196. Poor mileage and slighly high HC levels
  197. engine oil cooler lines
  198. Smoke out of exhaust
  199. Cleaned out my EGR tubes today, my E.4.8 code is gone!
  200. code help
  201. Low mileage 4.9 Idling Rough Engine Sputters and quits
  202. First time Caddy owner needs some advice please
  203. Trouble with diagnostics
  204. changing oil pump in 90 deville 4.5
  205. Help I dont want to get rid of my car BUT!
  206. Has anyone changed their catalytic converter?
  207. 4.9 Liter idle
  208. Removing hydraulic fittings
  209. How many miles on the 4.9? ?
  210. 88 Sedan Deville not liking the winter
  211. Coolant hose to blower motor
  212. Timing Question
  213. '84 Eldorado blown head gasket?
  214. Oil pan heater?
  215. 4.9 Deville 95 whining noise like supercharger..
  216. Location of the CAM Position Sensor on the 95 4.9L deville?
  217. YES, i did it!!! All went well!
  218. 92 Eldo 4.9 for sale
  219. 4.5 water pump
  220. 93 4.9 STS wont start
  221. DESPERATELY Need Help!!! 85 CDV
  222. Trying to find good price on Allante gear reduction to use on my 4.9
  223. How to clean out EGR valves and throttle body?
  224. time for engine replacement soon-- help!
  225. Heater
  226. Hard starting
  227. 4.5 differences
  228. E98 rectification
  229. 87 fleetwood new ignition problem
  230. 1985 deville 4.1 Injector fuse keeps blowing
  231. PCM override, PS10
  232. EGR solenoid, is it normal?
  233. Get a LARGER capacity, 3 row radiator?
  234. Smoky when at full throttle!
  235. What does the code F.8.5 mean?
  236. 87 fleetwood 4.1 three problems,advice please!
  237. Removed Distributor--Question Before I Restart
  238. Changed the oil pump, lifter still taps on occasion warmed up..
  239. 87 deville, E48, EGR system problem
  240. Additive for newly remaned 86 DeVille Trans??
  241. Is it possible for a 4.9 main bearing thump to get progressively worse?
  242. 1989 Sedandeville issues
  243. 15W-40 Oil .....
  244. Fuel
  245. 82 eldorado alternator bracket
  246. 85 Deville ISC Problem--Might Have the Answer
  247. Help me Please!!!
  248. Weird idea
  249. Engine miss
  250. Pulled a thread