: HT4100 4.1, 4.5, 4.9



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  1. HT4100 Driveability Question/Problem
  2. Replacing water pump on '87 4100 - tips?
  3. Plug Wire Order-87 Ht4100
  4. intermittent miss and other weird happenings
  5. 4.5 Cooling System Woes...
  6. HT4100 SYSTEM PROBLEM E047 and B334
  7. Is lifter tick normal on a 4.9?
  8. Coolant and Supplement Change Intervals
  9. 4.1 v8 injector resistance
  10. OIL cooler lines leaking
  11. engine oil
  12. Need help
  13. Need a little help
  14. No Spark
  15. Normal??
  16. Coolant Questions
  17. Another tip for 4.x car owners
  18. Trans Fluid Capacity, '93 Deville, 4.9
  19. dumb question, anyone know where the pcv is on a 4.9?
  20. 4.9 hesitates on highway
  21. How many miles can you expect out of a 4.9 engine and transmission?
  22. 4.9 Exhaust Note
  23. 4.9 Will Not Idle Below 2500rpm!
  24. Engine miss.......AGAIN
  25. Ht4100 V8
  26. Need transmission advice, please!
  27. Not Sure What Engine I have
  28. Turbo Muffler on a 4.9
  29. Premium Fuel in the 4.9?
  30. Ht4100
  31. HT4100 v8 frd eldorado
  32. Alternator issues
  33. HT4100 Hesitation Advice
  34. A/C Recharge
  35. Anyone change a starter on a FWD 4100?
  36. ac problems
  37. 1991 Seville
  38. 1985 Eldorado thinks it a diesel?
  39. 4.9 Problems at Wide Open Throttle
  40. Eldorado and the 4.1 engine ... ????
  41. HT 4100: Avoid at all costs????? Help!
  42. Changed PCV Valve at 98k Miles
  43. Engine Noise
  44. Speed Limiter
  45. Starter/voltage problem...
  46. engine swaps - 4500, 4900, 4100 engines
  47. Service Engine Light
  48. tachometer [jumps] 4.9 Seville
  49. boost HP on a 4.9 in my 1992 seville
  50. 83 Coupe Deville hard code 33 problems
  51. 4.9 shudder when at idle
  52. Possible injector leaks?
  53. Out of no where, my 92 Eldo did not start today.
  54. HT4100 Engine 250V8
  55. Help with and '89 Deville w/4.5L
  56. Tune-up questions, spark plugs
  57. Mystery Grind in Transmission, Engine, Where?
  58. 85 Deville 4100 Driveability
  59. I dread turning this car off!
  60. 4.9 instead of 4.5??
  61. 88 cdv
  62. Should I buy a car with a 4.1 L Engine?
  63. Ok ive given up on this engine.
  64. Oil test shows coolant contamination in 4.9!
  65. Need 2 things please...
  66. honest mpg of 4.9 city driving survey
  67. transmission bump on downshift
  68. ISC motor 1993 Deville
  69. Think i messed something up
  70. A little help needed identifying a loose connector
  71. Intermittent ISC? TPS? Problem still
  72. 4.9 STILL runs rough sets codes
  73. TPS Question
  74. Maitenance Questions, 4.9L 1993 Deville
  75. loud rumble now when stopping now
  76. 4.1L Oil Cooler path through Radiator
  77. Can overheating a 4.9L once damage your headgaskets?
  78. 4.9L: original red/blue A/C valve caps?
  79. Better intake for the 4.1L
  80. Idle is too high now
  81. Slight fuel leak at TBI
  82. Check Vehicle Light
  83. Setting Timing on '84 HT4100 4.1L
  84. tuning Questions for a 93 deville
  85. gas leak from cannister (85 Eldorado)
  86. High startup idle?
  87. Car wont shift on its own but shifts manually
  88. Coolant Supplement?
  89. Calling all 4.5 PFI and 4.9 PFI Owners
  90. Think the engine/tranny would last?
  91. Rocker Arm Support Part Problem-HELP?
  92. Problems w/ 4.9
  93. HT4100 Misfire Question
  94. indexing spark plugs
  95. 4.5L L (front) Cracked Header
  96. Alternator Issues--Please Help!
  97. Another Isc Question?
  98. 4.1L.. What's the problem?
  99. Best way to bleed the cooling system?
  100. car runs too rich didnt pass smog
  101. ht4100 engine cleanup. how to?
  102. Why An Aluminum Block with Iron Heads?
  103. 1985 deville runs great but
  104. 85 Seville with 4.1 Engine: Buy or Run?
  105. Anyone change the valve cover gaskets?
  106. Horrendous gas mileage
  107. Failed smog test - high CO
  108. Looking f/a 4100 4.1?
  109. 85 Deville TV Cable Adjustment
  110. fuel injection??>??
  111. 4.9L seville/deville fastchips or superchips performance chip
  112. keeps going like the energizer bunny
  113. E055 OBD1 Code
  114. Air Filter Question
  115. Serevice engine soon
  116. 4.1/4100 Distributor Hold down- how to tighten???
  117. 4.9 litre plug wire access problem.
  118. Engine mount - Any unique replacements?
  119. 4.9 Squeaking at Idle
  120. The continuing saga of my tranny problems...please help!
  121. 86 Fleetwood engine swap
  122. What senses the RPM on HT4100 engines?
  123. Open Throttle Switch Signal E27
  124. 83 FWB Idle Problems
  125. Got a code do not know what or where to check
  126. weird SES and hard start problem
  127. Sputtering, loss of power when hot
  128. Your opinion of the 4.5L V8 in the 88 DeVille
  129. oil
  130. Tranny Slipping?
  131. part identification 4.9
  132. 1992 seville 4.9 fuel filter location
  133. Good old 83' Coupe Deville
  134. new cadillac seville owner coolant flush
  135. 1993 Deville power steering pump failure
  136. ECM software
  137. 130 mph in a 4.9!
  138. Frozen Pulley
  139. Ignition Module issue
  140. Removing EGR valve - 4100
  141. Bad alternator in 93 Deville, need help
  142. Restore Lubricants
  143. Bad Head Gasket 92 DeVille 4.9- Need opinion
  144. Throttle Position Sensor Misadjusted
  145. A.I.R. Pump 4.5l '89 Deville
  146. temp sensor
  147. Don't ask oil questions on this site.
  148. 1985 deville died
  149. where do i go from here
  150. Need Help On Two More Things
  151. serious help needed
  152. 1983 Caddy transmission
  153. Strange Timing Issues
  154. Mobil 1 10W30
  155. 1985 Deville with a 4100 and it will not crank
  156. 1985 Deville with a 4100 and it will not crank
  157. Code E48 diagnosis
  158. codes ???please help
  159. 4.5 Allante intake on 93 4.9 deville
  160. New Trouble Code
  161. 1989 Caddy Deville......
  162. Throttle Body Plate issue
  163. Code and Coolant Prob.
  164. Low oil pressure!
  165. Oil Cooler Lines Leaking
  166. 1989 Caddy Deville......help!!!
  167. Stallling at idle
  168. gas pedal
  169. 4.5 TBI rough idle
  170. 94 Deville has almost no power from start
  171. 84 eldo conv't - 70 weight oil - yes or no?
  172. E012,E053 Won't run
  173. 1990 Seville Timing chain?
  174. 4.9 groaning
  175. '84 Eldo Code 44
  176. HT-4500 Starting trouble
  177. Speedometer Sensor issue ?
  178. The Ultimate FWD Cadillac Engine Swap
  179. Sticky Gas Pedal...4.5L
  180. Underhood smoking... need help with a diagnosis
  181. Fixed EGR now MPG is lower
  182. engin and trany swap for an 85 coupe deville
  183. Favorite things about the 4.9?
  184. 86 EGR Valve
  185. 4.5 TBI smoking
  186. Fuel pump on 4.9 92 Deville
  187. Fleetwood/DeVille Speedometer
  188. 4.1 Knock?? Or Tap??
  189. 1990 deville 4.5 air pump noisy
  190. 4.5L TBI Grumbling
  191. HT4500 and 4900 series Performance
  192. 4.1L injector
  193. how to get more hp from a 4100
  194. Intermittent Lurch—91 DeVille 4.9
  195. MAP Problems
  196. Oil Level
  197. How to start when very cold (less than 0 F)
  198. Need Help Please
  199. Engine surges at slow speed
  200. Stop Engine, Low Oil Pressure
  201. 1988 Fleetwood 4.5 Distributor order
  202. 1985 Seville Power Steering Pulley bolt
  203. Installing oil pump in 4.9 engine.
  204. 1985 deville ht4100 jump start
  205. GM Top End Cleaner Has Been Discontinued
  206. Makes Me Happy!
  207. HT4100 Question
  208. HT 4100 knock, 83 Eldorado (I know, another thread on this)
  209. Makes me nervous!
  210. 4.9 E55 code. TPS?
  211. Thoughts on the 4.5
  212. power steering leakk
  213. The SEA FOAM experience thread.
  214. Oh just great, a collapsed lifter in #1 cylinder!!
  215. 94 4.9 bypass siezed A/C compressor
  216. 85 Deville Still Has Poor Performance
  217. Need exhaust manifolds 4.1 HT4100
  218. 93 Deville stalls after car warms up
  219. New Caddy Owner, Need Some Help
  220. Rattle Under Car
  221. What kind of ISC motor should i get?
  222. 84 eldorado fuse panel pictures?
  223. Crack in my Block
  224. 93 DeVille AC converter clutch bypass ???
  225. Cooling System - Water Pump Conditioner/Anti-Rust
  226. Stock Exhaust dimensions on 93 Devilles
  227. Campaign 95-C-72 (recall)
  228. fuel pressure????
  229. Just finished my 4.9 Water pump repair pics inside
  230. 4.9L Rear Oil Leak
  231. Quick question: Ignition Control Module
  232. Disaster
  233. EGR Valve
  234. 4.1 main bearing thump
  235. Tranny problems, E39!! Please help, dont want to rebuild...
  236. 95 Deville 4.9 need help
  237. OMG water pump problem!
  238. Bypass Catalytic Converter on 1993 Deville?
  239. Starter motor gone on 87 deville 4.1
  240. Need help 4.9 L Fuel Delivery problem
  241. 92 4.9 DeVille runs horrible, sets codes
  242. Roller Lifters On The 4.9?
  243. water pump change on 4.1ltr
  244. 93 deville
  245. 1993 Cadillac Seville: Please Help starting problem
  246. Bad coil?
  247. Rebuilding a tbi on 89 deville
  248. I Broke it
  249. 4.9 Surges After Hot Start
  250. Poor mileage and slighly high HC levels