: HT4100 4.1, 4.5, 4.9



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