: HT4100 4.1, 4.5, 4.9



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  1. Alternator issues
  2. HT4100 Hesitation Advice
  3. A/C Recharge
  4. Anyone change a starter on a FWD 4100?
  5. ac problems
  6. 1991 Seville
  7. 1985 Eldorado thinks it a diesel?
  8. 4.9 Problems at Wide Open Throttle
  9. Eldorado and the 4.1 engine ... ????
  10. HT 4100: Avoid at all costs????? Help!
  11. Changed PCV Valve at 98k Miles
  12. Engine Noise
  13. Speed Limiter
  14. Starter/voltage problem...
  15. engine swaps - 4500, 4900, 4100 engines
  16. Service Engine Light
  17. tachometer [jumps] 4.9 Seville
  18. boost HP on a 4.9 in my 1992 seville
  19. 83 Coupe Deville hard code 33 problems
  20. 4.9 shudder when at idle
  21. Possible injector leaks?
  22. Out of no where, my 92 Eldo did not start today.
  23. HT4100 Engine 250V8
  24. Help with and '89 Deville w/4.5L
  25. Tune-up questions, spark plugs
  26. Mystery Grind in Transmission, Engine, Where?
  27. 85 Deville 4100 Driveability
  28. I dread turning this car off!
  29. 4.9 instead of 4.5??
  30. 88 cdv
  31. Should I buy a car with a 4.1 L Engine?
  32. Ok ive given up on this engine.
  33. Oil test shows coolant contamination in 4.9!
  34. Need 2 things please...
  35. honest mpg of 4.9 city driving survey
  36. transmission bump on downshift
  37. ISC motor 1993 Deville
  38. Think i messed something up
  39. A little help needed identifying a loose connector
  40. Intermittent ISC? TPS? Problem still
  41. 4.9 STILL runs rough sets codes
  42. TPS Question
  43. Maitenance Questions, 4.9L 1993 Deville
  44. loud rumble now when stopping now
  45. 4.1L Oil Cooler path through Radiator
  46. Can overheating a 4.9L once damage your headgaskets?
  47. 4.9L: original red/blue A/C valve caps?
  48. Better intake for the 4.1L
  49. Idle is too high now
  50. Slight fuel leak at TBI
  51. Check Vehicle Light
  52. Setting Timing on '84 HT4100 4.1L
  53. tuning Questions for a 93 deville
  54. gas leak from cannister (85 Eldorado)
  55. High startup idle?
  56. Car wont shift on its own but shifts manually
  57. Coolant Supplement?
  58. Calling all 4.5 PFI and 4.9 PFI Owners
  59. Think the engine/tranny would last?
  60. Rocker Arm Support Part Problem-HELP?
  61. Problems w/ 4.9
  62. HT4100 Misfire Question
  63. indexing spark plugs
  64. 4.5L L (front) Cracked Header
  65. Alternator Issues--Please Help!
  66. Another Isc Question?
  67. 4.1L.. What's the problem?
  68. Best way to bleed the cooling system?
  69. car runs too rich didnt pass smog
  70. ht4100 engine cleanup. how to?
  71. Why An Aluminum Block with Iron Heads?
  72. 1985 deville runs great but
  73. 85 Seville with 4.1 Engine: Buy or Run?
  74. Anyone change the valve cover gaskets?
  75. Horrendous gas mileage
  76. Failed smog test - high CO
  77. Looking f/a 4100 4.1?
  78. 85 Deville TV Cable Adjustment
  79. fuel injection??>??
  80. 4.9L seville/deville fastchips or superchips performance chip
  81. keeps going like the energizer bunny
  82. E055 OBD1 Code
  83. Air Filter Question
  84. Serevice engine soon
  85. 4.1/4100 Distributor Hold down- how to tighten???
  86. 4.9 litre plug wire access problem.
  87. Engine mount - Any unique replacements?
  88. 4.9 Squeaking at Idle
  89. The continuing saga of my tranny problems...please help!
  90. 86 Fleetwood engine swap
  91. What senses the RPM on HT4100 engines?
  92. Open Throttle Switch Signal E27
  93. 83 FWB Idle Problems
  94. Got a code do not know what or where to check
  95. weird SES and hard start problem
  96. Sputtering, loss of power when hot
  97. Your opinion of the 4.5L V8 in the 88 DeVille
  98. oil
  99. Tranny Slipping?
  100. part identification 4.9
  101. 1992 seville 4.9 fuel filter location
  102. Good old 83' Coupe Deville
  103. new cadillac seville owner coolant flush
  104. 1993 Deville power steering pump failure
  105. ECM software
  106. 130 mph in a 4.9!
  107. Frozen Pulley
  108. Ignition Module issue
  109. Removing EGR valve - 4100
  110. Bad alternator in 93 Deville, need help
  111. Restore Lubricants
  112. Bad Head Gasket 92 DeVille 4.9- Need opinion
  113. Throttle Position Sensor Misadjusted
  114. A.I.R. Pump 4.5l '89 Deville
  115. temp sensor
  116. Don't ask oil questions on this site.
  117. 1985 deville died
  118. where do i go from here
  119. Need Help On Two More Things
  120. serious help needed
  121. 1983 Caddy transmission
  122. Strange Timing Issues
  123. Mobil 1 10W30
  124. 1985 Deville with a 4100 and it will not crank
  125. 1985 Deville with a 4100 and it will not crank
  126. Code E48 diagnosis
  127. codes ???please help
  128. 4.5 Allante intake on 93 4.9 deville
  129. New Trouble Code
  130. 1989 Caddy Deville......
  131. Throttle Body Plate issue
  132. Code and Coolant Prob.
  133. Low oil pressure!
  134. Oil Cooler Lines Leaking
  135. 1989 Caddy Deville......help!!!
  136. Stallling at idle
  137. gas pedal
  138. 4.5 TBI rough idle
  139. 94 Deville has almost no power from start
  140. 84 eldo conv't - 70 weight oil - yes or no?
  141. E012,E053 Won't run
  142. 1990 Seville Timing chain?
  143. 4.9 groaning
  144. '84 Eldo Code 44
  145. HT-4500 Starting trouble
  146. Speedometer Sensor issue ?
  147. The Ultimate FWD Cadillac Engine Swap
  148. Sticky Gas Pedal...4.5L
  149. Underhood smoking... need help with a diagnosis
  150. Fixed EGR now MPG is lower
  151. engin and trany swap for an 85 coupe deville
  152. Favorite things about the 4.9?
  153. 86 EGR Valve
  154. 4.5 TBI smoking
  155. Fuel pump on 4.9 92 Deville
  156. Fleetwood/DeVille Speedometer
  157. 4.1 Knock?? Or Tap??
  158. 1990 deville 4.5 air pump noisy
  159. 4.5L TBI Grumbling
  160. HT4500 and 4900 series Performance
  161. 4.1L injector
  162. how to get more hp from a 4100
  163. Intermittent Lurch—91 DeVille 4.9
  164. MAP Problems
  165. Oil Level
  166. How to start when very cold (less than 0 F)
  167. Need Help Please
  168. Engine surges at slow speed
  169. Stop Engine, Low Oil Pressure
  170. 1988 Fleetwood 4.5 Distributor order
  171. 1985 Seville Power Steering Pulley bolt
  172. Installing oil pump in 4.9 engine.
  173. 1985 deville ht4100 jump start
  174. GM Top End Cleaner Has Been Discontinued
  175. Makes Me Happy!
  176. HT4100 Question
  177. HT 4100 knock, 83 Eldorado (I know, another thread on this)
  178. Makes me nervous!
  179. 4.9 E55 code. TPS?
  180. Thoughts on the 4.5
  181. power steering leakk
  182. The SEA FOAM experience thread.
  183. Oh just great, a collapsed lifter in #1 cylinder!!
  184. 94 4.9 bypass siezed A/C compressor
  185. 85 Deville Still Has Poor Performance
  186. Need exhaust manifolds 4.1 HT4100
  187. 93 Deville stalls after car warms up
  188. New Caddy Owner, Need Some Help
  189. Rattle Under Car
  190. What kind of ISC motor should i get?
  191. 84 eldorado fuse panel pictures?
  192. Crack in my Block
  193. 93 DeVille AC converter clutch bypass ???
  194. Cooling System - Water Pump Conditioner/Anti-Rust
  195. Stock Exhaust dimensions on 93 Devilles
  196. Campaign 95-C-72 (recall)
  197. fuel pressure????
  198. Just finished my 4.9 Water pump repair pics inside
  199. 4.9L Rear Oil Leak
  200. Quick question: Ignition Control Module
  201. Disaster
  202. EGR Valve
  203. 4.1 main bearing thump
  204. Tranny problems, E39!! Please help, dont want to rebuild...
  205. 95 Deville 4.9 need help
  206. OMG water pump problem!
  207. Bypass Catalytic Converter on 1993 Deville?
  208. Starter motor gone on 87 deville 4.1
  209. Need help 4.9 L Fuel Delivery problem
  210. 92 4.9 DeVille runs horrible, sets codes
  211. Roller Lifters On The 4.9?
  212. water pump change on 4.1ltr
  213. 93 deville
  214. 1993 Cadillac Seville: Please Help starting problem
  215. Bad coil?
  216. Rebuilding a tbi on 89 deville
  217. I Broke it
  218. 4.9 Surges After Hot Start
  219. Poor mileage and slighly high HC levels
  220. engine oil cooler lines
  221. Smoke out of exhaust
  222. Cleaned out my EGR tubes today, my E.4.8 code is gone!
  223. code help
  224. Low mileage 4.9 Idling Rough Engine Sputters and quits
  225. First time Caddy owner needs some advice please
  226. Trouble with diagnostics
  227. changing oil pump in 90 deville 4.5
  228. Help I dont want to get rid of my car BUT!
  229. Has anyone changed their catalytic converter?
  230. 4.9 Liter idle
  231. Removing hydraulic fittings
  232. How many miles on the 4.9? ?
  233. 88 Sedan Deville not liking the winter
  234. Coolant hose to blower motor
  235. Timing Question
  236. '84 Eldorado blown head gasket?
  237. Oil pan heater?
  238. 4.9 Deville 95 whining noise like supercharger..
  239. Location of the CAM Position Sensor on the 95 4.9L deville?
  240. YES, i did it!!! All went well!
  241. 92 Eldo 4.9 for sale
  242. 4.5 water pump
  243. 93 4.9 STS wont start
  244. DESPERATELY Need Help!!! 85 CDV
  245. Trying to find good price on Allante gear reduction to use on my 4.9
  246. How to clean out EGR valves and throttle body?
  247. time for engine replacement soon-- help!
  248. Heater
  249. Hard starting
  250. 4.5 differences