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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. im new here but here goes...
  2. '85 Fleetwood Brougham High Idel
  3. No fuel delivery to '87 Biaritz
  4. Better performance out of my 4.5?
  5. '89 SD 4.5 Diag. code E59, nowhere to be found.
  6. 1992 Eldorado Belt Size HELP! 4.9l
  7. Cadillac code check...
  8. $.1 motor
  9. to fix 1 or the other
  10. Caddy problems
  11. Is there a 4.9L NOS Kit?
  12. idiot lights.....
  13. i need help
  14. front pulley torque
  15. More 4.9 issues
  16. what are the best spark plugs?
  17. Engine Dyagnostic Codes
  18. information center
  19. Oil Leak 91 Eldorado 4.9
  20. idle speed adjustment
  21. Best oil filter?
  22. My errors have returned, inexplicibly. Help.
  23. DMV high emitter profile 4100 engine
  24. question on 91-up caddys with 4.9 engine
  25. Dual Output Muffler on a 91 Deville
  26. Cracked Manifold
  27. 10W40 oil is a bad weight?
  28. Dynomax Super Turbo
  29. Anyone have any luck With "Performance Modules"
  30. New To 4.9s And Have A few ?s
  31. 1990 TPS relearn procedure . . .
  32. engine backfires out of throtle body
  33. 88 eldo 4.5, changed the intake gasket yesterday!!
  34. Oil leak 4.5 engine 91 Allante
  35. Motor oil brand
  36. Coolant Leak Fixed- Now Running Rough After Warmup
  37. HELP Failed Emissions!!
  38. 87 deville stalls after a few mins of driving..
  39. I need Info soon
  40. 1986 Coupe DeVille w/ HT4100 V8
  41. 4.5 reliability + durability
  42. Porting your intake....
  43. 91 seville codes
  44. What engine and box can replace 4.1?
  45. 4.1 Autobox advice needed
  46. dealer shocks with 4.9 "information"
  47. Clearing codes on a '90 Fleetwood FWD
  48. Stalling 93 Seviile
  49. My 90's got sensor issues (and a glowing Cat Conv)
  50. 89 sedan deville major problem
  51. 4.5 is just a bigger 4.1? PLUS - BarsLeak or not?
  52. Hard to start below 0 F
  53. 82 4100 front crank oil leak
  54. 1992 Seville High Idle??
  55. Low Oil Pressure - 84 Eldo
  56. Computer Codes and Stereo Questions
  57. didn't pass emissions???
  58. Cooling Problems
  59. My '87 Deville is not running good when warm
  60. Oxygen Sensors - 1993 4.9
  61. Chips
  62. 4.5L V8 engine block leaking?
  63. Best way to use GM top end cleaner in the 4.9?
  64. 94 4.9L S-belt idlers blown - help!!
  65. 4.9L Injectors
  66. Tune up - do I have a distributor cap and rotor?
  67. 4.9 knocks under load
  68. 4.9l V8 Sfi Ohv 16v
  69. such a....BAD vibration..
  70. Can I use any coolant in my 4.9?
  71. 1995 Deville... ONLY 28K miles.... HELP
  72. NO Heat - Deville '87
  73. What can I do to make my 4.9 run like new??
  74. What kind of mpg should I be getting in my 92 4.9?
  75. Diesel engine smell on a 90 Deville
  76. HT4100 strange coolant problem
  77. Significant V4.9 engine vibration at 1300-1600 RPM
  78. Egr!!!
  79. Need 90 SDV 4.5 Idle Reset Procedure & Diag Codes
  80. Replacing HT4100 FWD
  81. Hmmmm
  82. wheres the fuel pump on my 87..?
  83. Allante Intakes
  84. Return-to-idle switch
  85. PC interface for 1994 ???
  86. low oil pressure light
  87. Low oil pressure light when breaking
  88. 92 Deville 4.9L..how many O2 sensors.
  89. 4.9 fuel injection questions
  90. Water pump change
  91. car just stalled..not starting..oil light
  92. 85 deville low idle
  93. 1991 4.9 hesitation problem
  94. oil /STOP light and "smokey" oil on 87 caddy...
  95. code E40..power steering pressure switch..anyone else with the same problem?
  96. 4.5 oil pan removal
  97. EGR Pipe Leak
  98. HELP!! Before I kill my car!
  99. HP on a 4.9L
  100. Bad gas mileage
  101. Oil pan removal 89 Coupe Deville
  102. Iac
  103. Engine swap Question, Want to dump 4100.
  104. My car runs like POOP!!
  105. 4.9 Oil Leak
  106. Recurring misfire/injector problem?
  107. isc relearn
  108. 4.9L Idle Problem
  109. Open and closed loop
  110. stalling
  111. Cadillac engine in Sand Rail
  112. oil pressure switch on 82' 4100
  113. Running Rough After Tune Up???
  114. '87 Deville with oil light on..while in idle...help please!
  115. 4.9 Headgaskets
  116. Solved What I thought was an exhaust rattle
  117. Exhaust/Tailpipe Question
  118. 4.9 Liter Performance
  119. 4.5 fwd to chevy 350
  120. no power /bad mileage
  121. missing 4100 engine, 1988
  122. I'm trying to save a Seville from the crusher
  123. Swapping 4100 for 307. Any advice?
  124. Deville runs rough under 11 gallons of gas
  125. Engine shutter on expressway
  126. 1989 caddy surging
  127. 1988 Seville (oil-le3aks)
  128. 86 Deville,swap 4.1 for 4.9.....
  129. performance exhaust for 4.9
  130. Interestingly Odd Problem!
  131. Deville 4.9 Intake Mods?
  132. BIG problem with the AIR system.....
  133. Ran rough for one minute, then gone!??
  134. What a stupid place for an oil filter!!
  135. best oil for high mileage 4.9
  136. RPM at idle for 1987 cadillac eldorado
  137. 4100 service now light
  138. 89 Cadillac Deville
  139. 1990 Allante won't start
  140. Heater core replaced, now AC line is freezing
  141. Disappearing coolant
  142. O2 sensor
  143. Oh No!!!!! Blown 4.9 Headgasket !!!!
  144. how to/ Tune up
  145. Help!! 95 Deville Fuel Inj Test
  146. 4.9 performance
  147. 92 Eldo Problems
  148. Need info on the fuel injection system on the 4100
  149. car problems
  150. firing order
  151. stripped cylinder head bolt hole on a 4.9L
  152. Newbie looking for HT4100 info
  153. Need 4.9 info.
  154. Oil Leak, 92, 4.9
  155. New member needs some help
  156. Trouble Shooting
  157. Bosch Fuel Injectors
  158. '94 Deville4.9L idles rough !
  159. Where is the fuel filter on a 90 Coupe DeVille??
  160. Engine Swaps and Expense
  161. 4.9 bearing thump
  162. Doss
  163. Recurring Cooling Problems - any ideas?
  164. Need Advise on ISC Adjustment
  165. 4.9 aftermarket (possibly)
  166. 4.9L and HEI help!
  167. 4.9 life expectancy
  168. Dead DeVille Aftermath!
  169. anyone with a GM manual ????angie????
  170. disable traction control
  171. Help! DeVille is dying!
  172. 4.5 vs. 4.9.... Allante....questions......
  173. check your egr tubes 4.9 bruthas
  174. 1984 4.1 liter waterpump
  175. H.E.I. Help Needed
  176. Low speed hesitation on pull away.
  177. 4.9 liter question
  178. bad EGR valve=poor mpg?
  179. 4.9 crappy milage
  180. More 4.9 Stall Problems!
  181. 4.9 jiggles
  182. injectors for '90 Deville
  183. 4.9 Stall Problem
  184. 1990 4.5 Deville rough idle/miss
  185. Service Code E30
  186. 4.9 performance
  187. What's so great about the 4.9 engine?
  188. 4.9 Serpentine Belt
  189. deck the heads?
  190. Leaky but good engine
  191. free power??
  192. 4.9 Performance Help
  193. Error Codes--please help
  194. throttle angle
  195. 1993 Deville
  196. 4.5 performance parts