: HT4100 4.1, 4.5, 4.9



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  1. New Electric "Turbo" not supercharger!
  2. coolant leak in 94 sedan deville (4.9)
  3. a few error codes
  4. She rufuses to be fixed
  5. 4.9 in a 85 fiero with caddy trans
  6. ISC motor acts sticky
  7. egr questions
  8. 88 Coupe deVille backfire
  9. Codes E01-E11, E95?
  10. Self Sticky - 4.9 Engine History and Changes
  11. smog pump adjustment
  12. new to forum
  13. engine missing
  14. 4.9 Idling fast and intermittent service light
  15. Interesting comparison.....
  16. Help! Caddy died and won't start
  17. popping sound when 4.9 is being raced....
  18. performance parts
  19. Injectors & Struts...
  20. 4.5L - 155hp, 180hp, 200hp variants and questions!
  21. power steering pulley
  22. 4.9 better than Northstar?
  23. ht 4100 question
  24. 1990 Deville E98
  25. transmission use
  26. Silent Performance Muffler
  27. Po85
  28. idle speed change?
  29. Cooling Fan Fault?
  30. What to do on a tune up to the 4.9?
  31. Transmission Oil Leak
  32. '90 Deville Speed Sensor.
  33. Nut down the distributor hole
  34. Trans Question 93 4.9 seville
  35. 350 SBC swap pics for DeVillish....
  36. 4.5 engine ticking noise???
  37. 4.5PFI Tune-up tips?
  38. 1990 Fleetwood to a 4.9 or N*
  39. 1985 Fleetwood FWD 4100
  40. tubes in throttle body
  41. Car shuts off after idle for 40 min
  42. ACDelco filter
  43. 1991 Fleetwood 4.9 high speed power loss
  44. Remote oil filter for 4.9 ?
  45. low oil pressure light
  46. 4.9 performance upgrades ?
  47. Premium fuel?
  48. How to find the leaky injector
  49. Cleaning the throttle body on a 4.9
  50. Spark plug removal on a 93 SDV
  51. Fuel Pump on 1990 deville
  52. 1991 Seville pics and questions
  53. Nylon or Metal timeing chain?
  54. im new here but here goes...
  55. '85 Fleetwood Brougham High Idel
  56. No fuel delivery to '87 Biaritz
  57. Better performance out of my 4.5?
  58. '89 SD 4.5 Diag. code E59, nowhere to be found.
  59. 1992 Eldorado Belt Size HELP! 4.9l
  60. Cadillac code check...
  61. $.1 motor
  62. to fix 1 or the other
  63. Caddy problems
  64. Is there a 4.9L NOS Kit?
  65. idiot lights.....
  66. i need help
  67. front pulley torque
  68. More 4.9 issues
  69. what are the best spark plugs?
  70. Engine Dyagnostic Codes
  71. information center
  72. Oil Leak 91 Eldorado 4.9
  73. idle speed adjustment
  74. Best oil filter?
  75. My errors have returned, inexplicibly. Help.
  76. DMV high emitter profile 4100 engine
  77. question on 91-up caddys with 4.9 engine
  78. Dual Output Muffler on a 91 Deville
  79. Cracked Manifold
  80. 10W40 oil is a bad weight?
  81. Dynomax Super Turbo
  82. Anyone have any luck With "Performance Modules"
  83. New To 4.9s And Have A few ?s
  84. 1990 TPS relearn procedure . . .
  85. engine backfires out of throtle body
  86. 88 eldo 4.5, changed the intake gasket yesterday!!
  87. Oil leak 4.5 engine 91 Allante
  88. Motor oil brand
  89. Coolant Leak Fixed- Now Running Rough After Warmup
  90. HELP Failed Emissions!!
  91. 87 deville stalls after a few mins of driving..
  92. I need Info soon
  93. 1986 Coupe DeVille w/ HT4100 V8
  94. 4.5 reliability + durability
  95. Porting your intake....
  96. 91 seville codes
  97. What engine and box can replace 4.1?
  98. 4.1 Autobox advice needed
  99. dealer shocks with 4.9 "information"
  100. Clearing codes on a '90 Fleetwood FWD
  101. Stalling 93 Seviile
  102. My 90's got sensor issues (and a glowing Cat Conv)
  103. 89 sedan deville major problem
  104. 4.5 is just a bigger 4.1? PLUS - BarsLeak or not?
  105. Hard to start below 0 F
  106. 82 4100 front crank oil leak
  107. 1992 Seville High Idle??
  108. Low Oil Pressure - 84 Eldo
  109. Computer Codes and Stereo Questions
  110. didn't pass emissions???
  111. Cooling Problems
  112. My '87 Deville is not running good when warm
  113. Oxygen Sensors - 1993 4.9
  114. Chips
  115. 4.5L V8 engine block leaking?
  116. Best way to use GM top end cleaner in the 4.9?
  117. 94 4.9L S-belt idlers blown - help!!
  118. 4.9L Injectors
  119. Tune up - do I have a distributor cap and rotor?
  120. 4.9 knocks under load
  121. 4.9l V8 Sfi Ohv 16v
  122. such a....BAD vibration..
  123. Can I use any coolant in my 4.9?
  124. 1995 Deville... ONLY 28K miles.... HELP
  125. NO Heat - Deville '87
  126. What can I do to make my 4.9 run like new??
  127. What kind of mpg should I be getting in my 92 4.9?
  128. Diesel engine smell on a 90 Deville
  129. HT4100 strange coolant problem
  130. Significant V4.9 engine vibration at 1300-1600 RPM
  131. Egr!!!
  132. Need 90 SDV 4.5 Idle Reset Procedure & Diag Codes
  133. Replacing HT4100 FWD
  134. Hmmmm
  135. wheres the fuel pump on my 87..?
  136. Allante Intakes
  137. Return-to-idle switch
  138. PC interface for 1994 ???
  139. low oil pressure light
  140. Low oil pressure light when breaking
  141. 92 Deville 4.9L..how many O2 sensors.
  142. 4.9 fuel injection questions
  143. Water pump change
  144. car just stalled..not starting..oil light
  145. 85 deville low idle
  146. 1991 4.9 hesitation problem
  147. oil /STOP light and "smokey" oil on 87 caddy...
  148. code E40..power steering pressure switch..anyone else with the same problem?
  149. 4.5 oil pan removal
  150. EGR Pipe Leak
  151. HELP!! Before I kill my car!
  152. HP on a 4.9L
  153. Bad gas mileage
  154. Oil pan removal 89 Coupe Deville
  155. Iac
  156. Engine swap Question, Want to dump 4100.
  157. My car runs like POOP!!
  158. 4.9 Oil Leak
  159. Recurring misfire/injector problem?
  160. isc relearn
  161. 4.9L Idle Problem
  162. Open and closed loop
  163. stalling
  164. Cadillac engine in Sand Rail
  165. oil pressure switch on 82' 4100
  166. Running Rough After Tune Up???
  167. '87 Deville with oil light on..while in idle...help please!
  168. 4.9 Headgaskets
  169. Solved What I thought was an exhaust rattle
  170. Exhaust/Tailpipe Question
  171. 4.9 Liter Performance
  172. 4.5 fwd to chevy 350
  173. no power /bad mileage
  174. missing 4100 engine, 1988
  175. I'm trying to save a Seville from the crusher
  176. Swapping 4100 for 307. Any advice?
  177. Deville runs rough under 11 gallons of gas
  178. Engine shutter on expressway
  179. 1989 caddy surging
  180. 1988 Seville (oil-le3aks)
  181. 86 Deville,swap 4.1 for 4.9.....
  182. performance exhaust for 4.9
  183. Interestingly Odd Problem!
  184. Deville 4.9 Intake Mods?
  185. BIG problem with the AIR system.....
  186. Ran rough for one minute, then gone!??
  187. What a stupid place for an oil filter!!
  188. best oil for high mileage 4.9
  189. RPM at idle for 1987 cadillac eldorado
  190. 4100 service now light
  191. 89 Cadillac Deville
  192. 1990 Allante won't start
  193. Heater core replaced, now AC line is freezing
  194. Disappearing coolant
  195. O2 sensor
  196. Oh No!!!!! Blown 4.9 Headgasket !!!!
  197. how to/ Tune up
  198. Help!! 95 Deville Fuel Inj Test
  199. 4.9 performance
  200. 92 Eldo Problems
  201. Need info on the fuel injection system on the 4100
  202. car problems
  203. firing order
  204. stripped cylinder head bolt hole on a 4.9L
  205. Newbie looking for HT4100 info
  206. Need 4.9 info.
  207. Oil Leak, 92, 4.9
  208. New member needs some help
  209. Trouble Shooting
  210. Bosch Fuel Injectors
  211. '94 Deville4.9L idles rough !
  212. Where is the fuel filter on a 90 Coupe DeVille??
  213. Engine Swaps and Expense
  214. 4.9 bearing thump
  215. Doss
  216. Recurring Cooling Problems - any ideas?
  217. Need Advise on ISC Adjustment
  218. 4.9 aftermarket (possibly)
  219. 4.9L and HEI help!
  220. 4.9 life expectancy
  221. Dead DeVille Aftermath!
  222. anyone with a GM manual ????angie????
  223. disable traction control
  224. Help! DeVille is dying!
  225. 4.5 vs. 4.9.... Allante....questions......
  226. check your egr tubes 4.9 bruthas
  227. 1984 4.1 liter waterpump
  228. H.E.I. Help Needed
  229. Low speed hesitation on pull away.
  230. 4.9 liter question
  231. bad EGR valve=poor mpg?
  232. 4.9 crappy milage
  233. More 4.9 Stall Problems!
  234. 4.9 jiggles
  235. injectors for '90 Deville
  236. 4.9 Stall Problem
  237. 1990 4.5 Deville rough idle/miss
  238. Service Code E30
  239. 4.9 performance
  240. What's so great about the 4.9 engine?
  241. 4.9 Serpentine Belt
  242. deck the heads?
  243. Leaky but good engine
  244. free power??
  245. 4.9 Performance Help
  246. Error Codes--please help
  247. throttle angle
  248. 1993 Deville
  249. 4.5 performance parts