: HT4100 4.1, 4.5, 4.9



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  1. 4.5 to 4.9
  2. 85 Seville 4.1 Knocking?
  3. poor gas milage
  4. Outside temp sensor location---4.9 litre.
  5. My Car is Fixed!!! New Camshaft and Lifters
  6. Water pumps...Generally speaking.
  7. NOISEY cold start ups with the pulleys, only to quiet down when warm.
  8. 93 deville 4.9 noisey cold pulleys, quiet when warm. whats going out?
  9. My speedometer is WAY off, and has problems in park
  10. 91 deville Starter enable relay
  11. gas issue
  12. '88 DeVille EXTREME ISC problems
  13. 92 STS - Stalls anywhere but the highway.
  14. 93 Eldawg Stalls while driving but drives great
  15. EGR System Question
  16. 1987 Cadillac Deville No Fuel Preasure Im lost
  17. ECM questions
  18. Bosch 19# Injectors
  19. I Lost First Gear, Car barely moves with throttle!
  20. 83 Deville Performance?
  21. would an oil stabilizer help with burning
  22. OBD1 Codes
  23. HT4100 Brand New
  24. Help! 1983 Seville with HT-4100 FWD, need ideas for a swap-out?
  25. 85 Fleetwood FWD Won't Start! Help!
  26. Any good 4.x mechanics in the Detroit area?
  27. Water Pump Removal
  28. 1985 4.1L Distibutor Drive Gear for oil pump
  29. 6.0L? say what?
  30. '91 4.9 swap into a rear drive application?
  31. 1985 Fleetwood FWD 4.1L hesitation/rough idle/won't start
  32. Possible Transmission Problem when shifting from park
  33. Water Pump - Snapped Bolt
  34. replacing camshaft bearings?
  35. 85 Deville 4.1L Oil problems.
  36. Won't Start After Driving
  37. need help concerning tune up
  38. should I replace the catalytic converter
  39. 1990 deville shifting problem
  40. TBI injectors
  41. Flat cam or bad lifter?
  42. Code E15???????
  43. flickering Service Soon and no codes...
  44. 4.1 Engine: Sensor Above #8 Spark Plug?
  45. how many mods do you all know about?
  46. high output alternator
  47. ISC RPM Out Of Range
  48. Non GM parts=sick Cadillac??
  49. 4.9 Deville Concours driving terrible again!
  50. Torque converter lock up solenoid, Where?
  51. Engine Swap
  52. 85 Eldo HT 4100 ISC/TPS
  53. 4.5 spark plugs
  54. 4100 engine temp??
  55. Weird 4.9l issues
  56. Finally Solved 4.1 Hesitation: Coil & Plug Wires
  57. Need help with 85 Eldo HT4100 Tuneup
  58. 91 Fleetwood injector impedence?
  59. How do I access the internal codes and what are the normal parameters for a '92 4.9?
  60. SERVICE SOON telltale light!!
  61. Cadillac 4.5L PFI and 4.9L PFI IAT?
  62. my 4100--what would you do
  63. Another BIG 4.x Engine Tip--Especially for 4.1 Owners
  64. what is that god awful smell
  65. '92 Deville 4.9 runs great at startup, runs like crap when hot
  66. e44 o2 error
  67. 4.1 Sputters and pops
  68. Tips on swapping HT4100 for 500
  69. Coolant Temp Light = Sensor?
  70. Need Tps Help
  71. 4.9l Starter Connection Problem
  72. 91 Deville 4.9l No Start Issue
  73. 4.9 stalling problem,and allante question
  74. Conflicting torque information
  75. Replaced Water Pump on 89 4.5 Still leaking
  76. 4100 seville engine swap help needed
  77. 4.1 to 4.9.... RWD?
  78. Blower motor not operating
  79. Any great 4.9 mods?
  80. Remanufactured HT4100 - 10K and now oil in radiator/leak
  81. HT4100 Running BAD when warm.
  82. EGR stack tubes?????
  83. HT4100 Backfires
  84. Checked your A.I.R. system filter lately?
  85. 1990 Deville PRNDL problem
  86. 1990 Deville running poorly.
  87. Thanks for the muffler info
  88. Fuel/exhaust smell seems too strong...dangerous?
  89. 4.9ltr Northstar performance?
  90. anyone know how to remove the crankshaft pully 1990 deville 4.5
  91. 1994 Deville Running Rough
  92. What does this code mean?
  93. Fuse Popping on AC Clutch
  94. 93 Seville 4.9 rough idle, slow response, P041 code
  95. 1985 Eldorado Engine Died! help!
  96. A 4.X Water Pump Story - Not for the Faint of Heart
  97. service vehicle soon is on my dash
  98. Intake gaskets leaking...common problem on the 4.9?
  99. newbie need help
  100. 4.9 Pinging
  101. Stumbling on the on ramps 4.9
  102. Advice/Help Please -- Goodyear Gave Up
  103. 4.9L idle issues... no power.. etc.. TPS?
  104. 4.9 Engine Oil Capacity - 92 Seville
  105. Eldorado Driveability
  106. New member planning mods to 90 STS
  107. 4.5L TBI whistling
  108. 4.9L 1991 Seville driving me crazy - won't start
  109. Fuel Data Center Answers
  110. PCV valve location on 4.9 litre.
  111. HT4100 Driveability Question/Problem
  112. Replacing water pump on '87 4100 - tips?
  113. Plug Wire Order-87 Ht4100
  114. intermittent miss and other weird happenings
  115. 4.5 Cooling System Woes...
  116. HT4100 SYSTEM PROBLEM E047 and B334
  117. Is lifter tick normal on a 4.9?
  118. Coolant and Supplement Change Intervals
  119. 4.1 v8 injector resistance
  120. OIL cooler lines leaking
  121. engine oil
  122. Need help
  123. Need a little help
  124. No Spark
  125. Normal??
  126. Coolant Questions
  127. Another tip for 4.x car owners
  128. Trans Fluid Capacity, '93 Deville, 4.9
  129. dumb question, anyone know where the pcv is on a 4.9?
  130. 4.9 hesitates on highway
  131. How many miles can you expect out of a 4.9 engine and transmission?
  132. 4.9 Exhaust Note
  133. 4.9 Will Not Idle Below 2500rpm!
  134. Engine miss.......AGAIN
  135. Ht4100 V8
  136. Need transmission advice, please!
  137. Not Sure What Engine I have
  138. Turbo Muffler on a 4.9
  139. Premium Fuel in the 4.9?
  140. Ht4100
  141. HT4100 v8 frd eldorado
  142. Alternator issues
  143. HT4100 Hesitation Advice
  144. A/C Recharge
  145. Anyone change a starter on a FWD 4100?
  146. ac problems
  147. 1991 Seville
  148. 1985 Eldorado thinks it a diesel?
  149. 4.9 Problems at Wide Open Throttle
  150. Eldorado and the 4.1 engine ... ????
  151. HT 4100: Avoid at all costs????? Help!
  152. Changed PCV Valve at 98k Miles
  153. Engine Noise
  154. Speed Limiter
  155. Starter/voltage problem...
  156. engine swaps - 4500, 4900, 4100 engines
  157. Service Engine Light
  158. tachometer [jumps] 4.9 Seville
  159. boost HP on a 4.9 in my 1992 seville
  160. 83 Coupe Deville hard code 33 problems
  161. 4.9 shudder when at idle
  162. Possible injector leaks?
  163. Out of no where, my 92 Eldo did not start today.
  164. HT4100 Engine 250V8
  165. Help with and '89 Deville w/4.5L
  166. Tune-up questions, spark plugs
  167. Mystery Grind in Transmission, Engine, Where?
  168. 85 Deville 4100 Driveability
  169. I dread turning this car off!
  170. 4.9 instead of 4.5??
  171. 88 cdv
  172. Should I buy a car with a 4.1 L Engine?
  173. Ok ive given up on this engine.
  174. Oil test shows coolant contamination in 4.9!
  175. Need 2 things please...
  176. honest mpg of 4.9 city driving survey
  177. transmission bump on downshift
  178. ISC motor 1993 Deville
  179. Think i messed something up
  180. A little help needed identifying a loose connector
  181. Intermittent ISC? TPS? Problem still
  182. 4.9 STILL runs rough sets codes
  183. TPS Question
  184. Maitenance Questions, 4.9L 1993 Deville
  185. loud rumble now when stopping now
  186. 4.1L Oil Cooler path through Radiator
  187. Can overheating a 4.9L once damage your headgaskets?
  188. 4.9L: original red/blue A/C valve caps?
  189. Better intake for the 4.1L
  190. Idle is too high now
  191. Slight fuel leak at TBI
  192. Check Vehicle Light
  193. Setting Timing on '84 HT4100 4.1L
  194. tuning Questions for a 93 deville
  195. gas leak from cannister (85 Eldorado)
  196. High startup idle?
  197. Car wont shift on its own but shifts manually
  198. Coolant Supplement?
  199. Calling all 4.5 PFI and 4.9 PFI Owners
  200. Think the engine/tranny would last?
  201. Rocker Arm Support Part Problem-HELP?
  202. Problems w/ 4.9
  203. HT4100 Misfire Question
  204. indexing spark plugs
  205. 4.5L L (front) Cracked Header
  206. Alternator Issues--Please Help!
  207. Another Isc Question?
  208. 4.1L.. What's the problem?
  209. Best way to bleed the cooling system?
  210. car runs too rich didnt pass smog
  211. ht4100 engine cleanup. how to?
  212. Why An Aluminum Block with Iron Heads?
  213. 1985 deville runs great but
  214. 85 Seville with 4.1 Engine: Buy or Run?
  215. Anyone change the valve cover gaskets?
  216. Horrendous gas mileage
  217. Failed smog test - high CO
  218. Looking f/a 4100 4.1?
  219. 85 Deville TV Cable Adjustment
  220. fuel injection??>??
  221. 4.9L seville/deville fastchips or superchips performance chip
  222. keeps going like the energizer bunny
  223. E055 OBD1 Code
  224. Air Filter Question
  225. Serevice engine soon
  226. 4.1/4100 Distributor Hold down- how to tighten???
  227. 4.9 litre plug wire access problem.
  228. Engine mount - Any unique replacements?
  229. 4.9 Squeaking at Idle
  230. The continuing saga of my tranny problems...please help!
  231. 86 Fleetwood engine swap
  232. What senses the RPM on HT4100 engines?
  233. Open Throttle Switch Signal E27
  234. 83 FWB Idle Problems
  235. Got a code do not know what or where to check
  236. weird SES and hard start problem
  237. Sputtering, loss of power when hot
  238. Your opinion of the 4.5L V8 in the 88 DeVille
  239. oil
  240. Tranny Slipping?
  241. part identification 4.9
  242. 1992 seville 4.9 fuel filter location
  243. Good old 83' Coupe Deville
  244. new cadillac seville owner coolant flush
  245. 1993 Deville power steering pump failure
  246. ECM software
  247. 130 mph in a 4.9!
  248. Frozen Pulley
  249. Ignition Module issue
  250. Removing EGR valve - 4100