: HT4100 4.1, 4.5, 4.9



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