: HT4100 4.1, 4.5, 4.9



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