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View Full Version : HT4100 4.1, 4.5, 4.9



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