: HT4100 4.1, 4.5, 4.9



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  1. Error code E31 (93 Deville 4.9L)
  2. 4.9 air filter question...
  3. please help
  4. 88 4.5 Coupe Deville
  5. Rough Idle, stalls and hesitations, but...
  6. Need Help with BarsLeak and Radiator drain!
  7. '92 4.9 operating temp
  8. Engine etc.
  9. Distributor Cap
  10. Car is running rich
  11. 4.1 oil capacity
  12. no heat in cab + overheating
  13. My 88 Sedan Deville, HELP!!!
  14. Removing Alternator On 91 4.9
  15. 4.9 Battery Cables?
  16. Performance Muffler - Ideas?
  17. Should I flush tranny at 52K????
  18. Need Allante Parts - HELP
  19. 251 Belt Problems? Alternator/Fan not working.
  20. 4.1 no start
  21. 4.9:Emission Fail, High HC
  22. Cooling System Pressure Test
  23. 4.9 cam specs.
  24. Requesting 4.5 89' Info
  25. 1988 Eldo fuel tank swap
  26. AC duct rattle
  27. 4.5 running like poop
  28. New Electric "Turbo" not supercharger!
  29. coolant leak in 94 sedan deville (4.9)
  30. a few error codes
  31. She rufuses to be fixed
  32. 4.9 in a 85 fiero with caddy trans
  33. ISC motor acts sticky
  34. egr questions
  35. 88 Coupe deVille backfire
  36. Codes E01-E11, E95?
  37. Self Sticky - 4.9 Engine History and Changes
  38. smog pump adjustment
  39. new to forum
  40. engine missing
  41. 4.9 Idling fast and intermittent service light
  42. Interesting comparison.....
  43. Help! Caddy died and won't start
  44. popping sound when 4.9 is being raced....
  45. performance parts
  46. Injectors & Struts...
  47. 4.5L - 155hp, 180hp, 200hp variants and questions!
  48. power steering pulley
  49. 4.9 better than Northstar?
  50. ht 4100 question
  51. 1990 Deville E98
  52. transmission use
  53. Silent Performance Muffler
  54. Po85
  55. idle speed change?
  56. Cooling Fan Fault?
  57. What to do on a tune up to the 4.9?
  58. Transmission Oil Leak
  59. '90 Deville Speed Sensor.
  60. Nut down the distributor hole
  61. Trans Question 93 4.9 seville
  62. 350 SBC swap pics for DeVillish....
  63. 4.5 engine ticking noise???
  64. 4.5PFI Tune-up tips?
  65. 1990 Fleetwood to a 4.9 or N*
  66. 1985 Fleetwood FWD 4100
  67. tubes in throttle body
  68. Car shuts off after idle for 40 min
  69. ACDelco filter
  70. 1991 Fleetwood 4.9 high speed power loss
  71. Remote oil filter for 4.9 ?
  72. low oil pressure light
  73. 4.9 performance upgrades ?
  74. Premium fuel?
  75. How to find the leaky injector
  76. Cleaning the throttle body on a 4.9
  77. Spark plug removal on a 93 SDV
  78. Fuel Pump on 1990 deville
  79. 1991 Seville pics and questions
  80. Nylon or Metal timeing chain?
  81. im new here but here goes...
  82. '85 Fleetwood Brougham High Idel
  83. No fuel delivery to '87 Biaritz
  84. Better performance out of my 4.5?
  85. '89 SD 4.5 Diag. code E59, nowhere to be found.
  86. 1992 Eldorado Belt Size HELP! 4.9l
  87. Cadillac code check...
  88. $.1 motor
  89. to fix 1 or the other
  90. Caddy problems
  91. Is there a 4.9L NOS Kit?
  92. idiot lights.....
  93. i need help
  94. front pulley torque
  95. More 4.9 issues
  96. what are the best spark plugs?
  97. Engine Dyagnostic Codes
  98. information center
  99. Oil Leak 91 Eldorado 4.9
  100. idle speed adjustment
  101. Best oil filter?
  102. My errors have returned, inexplicibly. Help.
  103. DMV high emitter profile 4100 engine
  104. question on 91-up caddys with 4.9 engine
  105. Dual Output Muffler on a 91 Deville
  106. Cracked Manifold
  107. 10W40 oil is a bad weight?
  108. Dynomax Super Turbo
  109. Anyone have any luck With "Performance Modules"
  110. New To 4.9s And Have A few ?s
  111. 1990 TPS relearn procedure . . .
  112. engine backfires out of throtle body
  113. 88 eldo 4.5, changed the intake gasket yesterday!!
  114. Oil leak 4.5 engine 91 Allante
  115. Motor oil brand
  116. Coolant Leak Fixed- Now Running Rough After Warmup
  117. HELP Failed Emissions!!
  118. 87 deville stalls after a few mins of driving..
  119. I need Info soon
  120. 1986 Coupe DeVille w/ HT4100 V8
  121. 4.5 reliability + durability
  122. Porting your intake....
  123. 91 seville codes
  124. What engine and box can replace 4.1?
  125. 4.1 Autobox advice needed
  126. dealer shocks with 4.9 "information"
  127. Clearing codes on a '90 Fleetwood FWD
  128. Stalling 93 Seviile
  129. My 90's got sensor issues (and a glowing Cat Conv)
  130. 89 sedan deville major problem
  131. 4.5 is just a bigger 4.1? PLUS - BarsLeak or not?
  132. Hard to start below 0 F
  133. 82 4100 front crank oil leak
  134. 1992 Seville High Idle??
  135. Low Oil Pressure - 84 Eldo
  136. Computer Codes and Stereo Questions
  137. didn't pass emissions???
  138. Cooling Problems
  139. My '87 Deville is not running good when warm
  140. Oxygen Sensors - 1993 4.9
  141. Chips
  142. 4.5L V8 engine block leaking?
  143. Best way to use GM top end cleaner in the 4.9?
  144. 94 4.9L S-belt idlers blown - help!!
  145. 4.9L Injectors
  146. Tune up - do I have a distributor cap and rotor?
  147. 4.9 knocks under load
  148. 4.9l V8 Sfi Ohv 16v
  149. such a....BAD vibration..
  150. Can I use any coolant in my 4.9?
  151. 1995 Deville... ONLY 28K miles.... HELP
  152. NO Heat - Deville '87
  153. What can I do to make my 4.9 run like new??
  154. What kind of mpg should I be getting in my 92 4.9?
  155. Diesel engine smell on a 90 Deville
  156. HT4100 strange coolant problem
  157. Significant V4.9 engine vibration at 1300-1600 RPM
  158. Egr!!!
  159. Need 90 SDV 4.5 Idle Reset Procedure & Diag Codes
  160. Replacing HT4100 FWD
  161. Hmmmm
  162. wheres the fuel pump on my 87..?
  163. Allante Intakes
  164. Return-to-idle switch
  165. PC interface for 1994 ???
  166. low oil pressure light
  167. Low oil pressure light when breaking
  168. 92 Deville 4.9L..how many O2 sensors.
  169. 4.9 fuel injection questions
  170. Water pump change
  171. car just stalled..not starting..oil light
  172. 85 deville low idle
  173. 1991 4.9 hesitation problem
  174. oil /STOP light and "smokey" oil on 87 caddy...
  175. code E40..power steering pressure switch..anyone else with the same problem?
  176. 4.5 oil pan removal
  177. EGR Pipe Leak
  178. HELP!! Before I kill my car!
  179. HP on a 4.9L
  180. Bad gas mileage
  181. Oil pan removal 89 Coupe Deville
  182. Iac
  183. Engine swap Question, Want to dump 4100.
  184. My car runs like POOP!!
  185. 4.9 Oil Leak
  186. Recurring misfire/injector problem?
  187. isc relearn
  188. 4.9L Idle Problem
  189. Open and closed loop
  190. stalling
  191. Cadillac engine in Sand Rail
  192. oil pressure switch on 82' 4100
  193. Running Rough After Tune Up???
  194. '87 Deville with oil light on..while in idle...help please!
  195. 4.9 Headgaskets
  196. Solved What I thought was an exhaust rattle
  197. Exhaust/Tailpipe Question
  198. 4.9 Liter Performance
  199. 4.5 fwd to chevy 350
  200. no power /bad mileage
  201. missing 4100 engine, 1988
  202. I'm trying to save a Seville from the crusher
  203. Swapping 4100 for 307. Any advice?
  204. Deville runs rough under 11 gallons of gas
  205. Engine shutter on expressway
  206. 1989 caddy surging
  207. 1988 Seville (oil-le3aks)
  208. 86 Deville,swap 4.1 for 4.9.....
  209. performance exhaust for 4.9
  210. Interestingly Odd Problem!
  211. Deville 4.9 Intake Mods?
  212. BIG problem with the AIR system.....
  213. Ran rough for one minute, then gone!??
  214. What a stupid place for an oil filter!!
  215. best oil for high mileage 4.9
  216. RPM at idle for 1987 cadillac eldorado
  217. 4100 service now light
  218. 89 Cadillac Deville
  219. 1990 Allante won't start
  220. Heater core replaced, now AC line is freezing
  221. Disappearing coolant
  222. O2 sensor
  223. Oh No!!!!! Blown 4.9 Headgasket !!!!
  224. how to/ Tune up
  225. Help!! 95 Deville Fuel Inj Test
  226. 4.9 performance
  227. 92 Eldo Problems
  228. Need info on the fuel injection system on the 4100
  229. car problems
  230. firing order
  231. stripped cylinder head bolt hole on a 4.9L
  232. Newbie looking for HT4100 info
  233. Need 4.9 info.
  234. Oil Leak, 92, 4.9
  235. New member needs some help
  236. Trouble Shooting
  237. Bosch Fuel Injectors
  238. '94 Deville4.9L idles rough !
  239. Where is the fuel filter on a 90 Coupe DeVille??
  240. Engine Swaps and Expense
  241. 4.9 bearing thump
  242. Doss
  243. Recurring Cooling Problems - any ideas?
  244. Need Advise on ISC Adjustment
  245. 4.9 aftermarket (possibly)
  246. 4.9L and HEI help!
  247. 4.9 life expectancy
  248. Dead DeVille Aftermath!
  249. anyone with a GM manual ????angie????
  250. disable traction control