: HT4100 4.1, 4.5, 4.9



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