: HT4100 4.1, 4.5, 4.9



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  1. Hole In Muffler(Recommended Replacement)
  2. 91 DeVille
  3. In reguard to my deville's rough idleing,could it just need an induction service?
  4. Code question.
  5. Plugs for 4.9
  6. 1994 Deville 4.9 (Serpentine Belt) - Save Me From the Junk Yard
  7. Inaccurate gas readout?
  8. 1990 Allante fuel injectors
  9. 4.9 with sleeves?
  10. 4.9 Air Cleaner
  11. Stoneage_caddy my deville is stuttering when idleing,any ideas?
  12. 92 4.9 fleetwood high idle
  13. 1994 4.9L won't pass emissions HCs too high How to fix?
  14. HELLO - I'm seeing an error code 52 - any idea what that means?
  15. 4100 Reliability
  16. 1982 eldorado low oiil pressure light on immediately after oil change??
  17. 82 deville VIBE SOLVED
  18. let the thing blow up??
  19. Low Oil Pressure Light 1982 eldorado
  20. engins problem
  21. radiator blew apart
  22. new to the forum - big problem
  23. Whats the best place to find a replacment 4.9
  24. RE: 82 deville
  25. 4.1 ELDO Hesitation and Stall
  26. 84 4.1 Eldo
  27. Fuel Injectors
  28. Regular gas vs. premium gas
  29. used injectors
  30. 82 deville vibration
  31. '84 Eldo Failed NOx
  32. Wow...26+ MPG in a 3900# vehicle with over 700 lbs of cargo/passengers
  33. Collapsed UPPER Rad Hose!
  34. injectors
  35. 4.9 Froze
  36. 4.1 Giving 3 codes...Need help
  37. Is the 4.9 Under Rated?
  38. I need a water pump have a couple of questions.
  39. 4.1 v6, 4.1 v8-- What's the differance?
  40. Dip Stick Tube
  41. 85 Fleetwood Brougham W/ 4100 -- No Start...
  42. Open or closed deck block
  43. Emission Results fine in set timing mode?
  44. A new problem...
  45. 4.9 Dead - How easy to swap in a 4.5?
  46. need some help
  47. What are common issues with the 4.9?
  48. injector part number
  49. Overheating not block or head 83 Brougham anyone know whats wrong?
  50. changing spark plugs
  51. A few qestions regarding timing, etc.
  52. 1990 feleetwood codes on air control panel
  53. 93 seville sls idle problems
  54. 86 Cadillac Deville Timing
  55. 85 FWB W/ 4100 Hesitation...
  56. 89 Deville, What would cause this?
  57. THROTTLE PROBLEMS 95 DeVILLE 4.9
  58. Can't seem to fond the answer.
  59. Anyone tested 4.9's fwhp?
  60. Could a catalytic convertor go bad in 2 years?
  61. Switched Oil and now it clatters!!!!!
  62. Fuel Injectors help!!!
  63. 1990 Allante Engine
  64. ISC motor ratchets after shutoff
  65. BBOB or ANYONE---A LITTLE HELP!!
  66. Need help with fuel system
  67. Got a VSS code on my 1990 Deville!!
  68. fuel injection parts
  69. Does the 4.9 really need 91 octane????
  70. When do u change the O2 sensors?
  71. 90 Deville hesitation after driving for hours
  72. 4.9 liter oil use?
  73. 91 DeVille--Problems to Watch For
  74. Failed Smog Test Please Help!!!
  75. Why would the NOx increase after my EGR is hooked up?
  76. 90 Deville runs like crap
  77. miss on the 4.5litre?
  78. Transmission service
  79. 91 caddy deville runs wrong
  80. 4.1 Serpentine Belt Frozen
  81. 'hidden Warranties'
  82. Please Help Me!!!
  83. high RPM, ISC not the problem?
  84. What is the Top mph a 4.9 can hit before it cuts off?
  85. what perfomance mods,if any???
  86. new problem arising?
  87. 4.9 Questions...
  88. 89 deville runs rough intermittantly??
  89. Injector Failure At 43,000 Miles???
  90. 4.1 Engine seems to be running rich
  91. 91 DeVille wants to go like crazy! Whats up?
  92. 4.1 Clutch Fan hooped?
  93. spark plug torque for 1991 4.9
  94. 93 Deville Werid Noise
  95. '90 Seville with 4.5 Knocks when warm
  96. Are the GM replacemnt 4100's a better design ?
  97. HT 4100 flooding out badly. Warm or cold
  98. fuel system problem...i think
  99. 85 eldo
  100. 94 deville loss of power
  101. where does the "gas mileage" sensor collect the data?
  102. leaking "fuel filter "??
  103. Dead mouse in the heater/ AC box HELP !!!
  104. 4.9 head gaskets fel-pro vs GM
  105. Fuel Guage problem
  106. help! i think i blew it. 4.5 hg
  107. 1988 4.5l fwd eats up distributor gears
  108. 88 eldo codes but why
  109. Source for sleeves 4.1 4.5 etc
  110. 85 FWB stalled out and won't start
  111. Should I buy it, guys?
  112. carb removal help urgent
  113. torx
  114. NEED HELP -Stalled 92 Seville STS, won't start
  115. Need help quick please 4.9 deville
  116. 1st post: Eldorado dies 3 miles after I bought it...HELP!
  117. 1990 Deville idle issue
  118. no rad fans 90 deville 4.5
  119. SERVICE SOON light comes on random, but serviced at dealer last year.
  120. Oil pressure in HT4100?
  121. MAP reading while applying brake
  122. tranny jumping in and out of gears
  123. Roaring Rattling Deville
  124. is my engine shot????
  125. 1990 cadillac sedan deville
  126. 4.9 Manifolds????
  127. 4.5L replacement for 4.1 in 84 eldo/seville?
  128. Rebuild 4.9L thread?
  129. 4.9 pushrod length/width?
  130. 4.1 engine questions
  131. Exaust question
  132. Low RPM ENgine Rough
  133. removing oil pan from 92 DeVille
  134. Steel Rocker Arm Supports
  135. 91 Eldorado Performance Tips
  136. A/C Leak
  137. TPS wiring Question.
  138. heres where im leaking coolant *pics
  139. 1991 SedanDeVille - "Service Engine Soon" Light
  140. The Surge/Stumble Revisited
  141. intermittent miss 4.5 1990 deville
  142. Adjusting the TPS - Right or Wrong?
  143. Whats up guys! I really need your help!!
  144. GM Coolant Pellets Do Not Work....
  145. Went through my codes today and...(help)
  146. 89 sedan deville hesitation problem--HELP!
  147. help with code please
  148. 4100 1990 deville
  149. Newbie here with a warning about Autozones (Wells) TPS
  150. Blown Head Gaskets 4.5 or 4.9 V8
  151. Red Line Water Wetter ?
  152. 4.5 Cooling System Additive
  153. 1987 Cadillac Sedan Deville
  154. My 1986 Cadi engine revs continually
  155. Hey, can anyone help me with this 4.9?
  156. 20w50 5W30 oil,not for use in a 4.9 liter engine?
  157. DeVille (DEVIL?) 91 *extreme* power loss.
  158. 92 Deville will not run with MAP sensor connected
  159. 85 Fleetwood 4.1 (FWD) NO START
  160. How to detect a misfiring cylinder....
  161. Why does '90 4.5L not drop to idle till almost stopped?
  162. start,start,no start
  163. Coolant Fan manual override switch
  164. Finally have my Eldorado back w/extra hp!!
  165. Do you have to change all 8 injectors on a 1992 4.9?
  166. Car overheat real bad when sitting still for 15 minute
  167. Changed Coolant Today!
  168. 4100 rwd deville swap
  169. '89 4.5L, 200k miles, oil leak behind waterpump?
  170. engine code e47
  171. crankcase pressure
  172. codes
  173. What grade of fuel should I use?
  174. Vibration in 1992 4.9!?!?!?!?
  175. engine races when started cold
  176. Look inside the 104k 4.9.... and a new valve cover :)
  177. need more hp!!!!!!
  178. 87 Seville 4.1 smokeing, don't know why.
  179. Rocker arm support installation question.
  180. What happened to my post?
  181. 4.5L timing?
  182. 4.9 Custom Header - Gauging Interest
  183. 95 Deville PO39 code need help!!!!!!!!!
  184. Converter Inlet Size??
  185. throttle switch short
  186. 4100 sleeve selection (rehash?)
  187. Oil change and now the light wont go out.
  188. Is it hard to change the coolant on the 4.1?
  189. Performance parts for caddy 4.9 engine?
  190. 4.9 Custom Air intake
  191. Radiator cap PSI for 4.9
  192. Timing 94 Deville
  193. rough running after warm up
  194. Nitrous in 4.9
  195. Stripped Head Bolt Threads
  196. 83 coupe air pump
  197. Removing cat-converter...good idea or no?
  198. URGENT!! Muffler?
  199. Finally summers here, first problem..brakes stuck
  200. leaking deville 4100 need bandaid
  201. Is 104C too hot for a 4.9L 1994 Deville?
  202. Is There Such A Thing As A Starter Motor Overheating?
  203. Illumina /Bbob/Nodh and other Tech types
  204. Possible Seville Engine Swap
  205. E39 Code
  206. 4.5 Performance?
  207. ht4100 bars leaks crap help
  208. 1990 4.5 needs new injectors
  209. My buddy thought the 4.9 was like 250hp!!
  210. Engine STILL missing (intermittant), tons of work done so far--HELP!!!
  211. rumble in the 'ville
  212. My Caddy won't start.
  213. Code 19....1984 DeVille
  214. Longevity of a 4.9L Is 150K too many miles?
  215. What are the common problem areas with 4.9Ls on 1994 Deville?
  216. Knock
  217. 4.9 straightpipes
  218. how common are coolant leaks in 4.9
  219. transmission trouble
  220. 1985 HT 4100 Cast Iron Block & Head???
  221. 93 Deville Idle Sticking
  222. Stuck with a HT4100? I have the solution!
  223. 4.9 problems
  224. Tranny Cooler Part Numbers:92 ETC
  225. 85 HT4100 Swap
  226. Engine knocking
  227. Oil leak (Bbob)
  228. Ht4100 Idle
  229. Any advice on a HT4100 while I'm fixing the timing chain/gears?
  230. dumbass in need of help
  231. HT4100 Idle speed (warmed up)?
  232. Transmission lags the downshifts + sometimes upshifts after high speed drive
  233. Changing Engine Coolant
  234. P085 ....... Idle Throttle Angle Too High
  235. serpantine belt problem, 92 deville
  236. Are You Sure Rotella Is good for the 4.9?
  237. antifreeze in oil please help bbob and all
  238. 89 STS torques to one side
  239. 88 eldorado 4.5 help please
  240. 4.9 water pump bolting question?
  241. 1992 Cadillac Sedan DeVille O2 Sensors
  242. 90 Eldo w/4.5 PROJECT CAR - Advice Desired
  243. fuel injector question
  244. It's the smog pump
  245. Removing/Reinstalling Accelerator Pedal
  246. Risks of Ethanol?
  247. 4.1 compression
  248. replaced water pump/wont start
  249. proper oil for 88 sedan deville
  250. Warmed up engine FLOWMASTER 40series DELTA FLOW clip