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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. PO41 No Cam reference Signal - broke down on trip
  2. 93 Seville radiator fan
  3. 88 eldo 4.5 running temp and code E027 ?'s
  4. No More Poop On Coupe ! Yea !
  5. How do you Remove&Clean Throttle Body, engines too big to see back there.
  6. VSS location?
  7. 4.5 intake gasket
  8. 92 Deville Starter heat shied
  9. 1992 sedan deville head gaskets?
  10. 84 cadillac seville chargeing problem
  11. New Deville Clips
  12. Are these holes in the airfilter housing supposed to have something... '84 HT4100 TBI
  13. Who sells a good CA legal catalytic conv. ?? - We have very strict Smog tests here.
  14. New to the forum....
  15. 94 Deville 4.9L ...P030 and some other codes....
  16. Brake cleaner - does it miff the engine gaskets?
  17. Warmed up engine FLOWMASTER 40series DELTA FLOW clip
  18. proper oil for 88 sedan deville
  19. replaced water pump/wont start
  20. 4.1 compression
  21. Risks of Ethanol?
  22. Removing/Reinstalling Accelerator Pedal
  23. It's the smog pump
  24. fuel injector question
  25. 90 Eldo w/4.5 PROJECT CAR - Advice Desired
  26. 1992 Cadillac Sedan DeVille O2 Sensors
  27. 4.9 water pump bolting question?
  28. 88 eldorado 4.5 help please
  29. 89 STS torques to one side
  30. antifreeze in oil please help bbob and all
  31. Are You Sure Rotella Is good for the 4.9?
  32. serpantine belt problem, 92 deville
  33. P085 ....... Idle Throttle Angle Too High
  34. Changing Engine Coolant
  35. Transmission lags the downshifts + sometimes upshifts after high speed drive
  36. HT4100 Idle speed (warmed up)?
  37. dumbass in need of help
  38. Any advice on a HT4100 while I'm fixing the timing chain/gears?
  39. Ht4100 Idle
  40. Oil leak (Bbob)
  41. Engine knocking
  42. 85 HT4100 Swap
  43. Tranny Cooler Part Numbers:92 ETC
  44. 4.9 problems
  45. Stuck with a HT4100? I have the solution!
  46. 93 Deville Idle Sticking
  47. 1985 HT 4100 Cast Iron Block & Head???
  48. transmission trouble
  49. how common are coolant leaks in 4.9
  50. 4.9 straightpipes
  51. Knock
  52. What are the common problem areas with 4.9Ls on 1994 Deville?
  53. Longevity of a 4.9L Is 150K too many miles?
  54. Code 19....1984 DeVille
  55. My Caddy won't start.
  56. rumble in the 'ville
  57. Engine STILL missing (intermittant), tons of work done so far--HELP!!!
  58. My buddy thought the 4.9 was like 250hp!!
  59. 1990 4.5 needs new injectors
  60. ht4100 bars leaks crap help
  61. 4.5 Performance?
  62. E39 Code
  63. Possible Seville Engine Swap
  64. Illumina /Bbob/Nodh and other Tech types
  65. Is There Such A Thing As A Starter Motor Overheating?
  66. Is 104C too hot for a 4.9L 1994 Deville?
  67. leaking deville 4100 need bandaid
  68. Finally summers here, first problem..brakes stuck
  69. URGENT!! Muffler?
  70. Removing cat-converter...good idea or no?
  71. 83 coupe air pump
  72. Stripped Head Bolt Threads
  73. Nitrous in 4.9
  74. rough running after warm up
  75. Timing 94 Deville
  76. Radiator cap PSI for 4.9
  77. 4.9 Custom Air intake
  78. Performance parts for caddy 4.9 engine?
  79. Is it hard to change the coolant on the 4.1?
  80. Oil change and now the light wont go out.
  81. 4100 sleeve selection (rehash?)
  82. throttle switch short
  83. Converter Inlet Size??
  84. 95 Deville PO39 code need help!!!!!!!!!
  85. 4.9 Custom Header - Gauging Interest
  86. 4.5L timing?
  87. What happened to my post?
  88. Rocker arm support installation question.
  89. 87 Seville 4.1 smokeing, don't know why.
  90. need more hp!!!!!!
  91. Look inside the 104k 4.9.... and a new valve cover :)
  92. engine races when started cold
  93. Vibration in 1992 4.9!?!?!?!?
  94. What grade of fuel should I use?
  95. codes
  96. crankcase pressure
  97. engine code e47
  98. '89 4.5L, 200k miles, oil leak behind waterpump?
  99. 4100 rwd deville swap
  100. Changed Coolant Today!
  101. Car overheat real bad when sitting still for 15 minute
  102. Do you have to change all 8 injectors on a 1992 4.9?
  103. Finally have my Eldorado back w/extra hp!!
  104. Coolant Fan manual override switch
  105. start,start,no start
  106. Why does '90 4.5L not drop to idle till almost stopped?
  107. How to detect a misfiring cylinder....
  108. 85 Fleetwood 4.1 (FWD) NO START
  109. 92 Deville will not run with MAP sensor connected
  110. DeVille (DEVIL?) 91 *extreme* power loss.
  111. 20w50 5W30 oil,not for use in a 4.9 liter engine?
  112. Hey, can anyone help me with this 4.9?
  113. My 1986 Cadi engine revs continually
  114. 1987 Cadillac Sedan Deville
  115. 4.5 Cooling System Additive
  116. Red Line Water Wetter ?
  117. Blown Head Gaskets 4.5 or 4.9 V8
  118. Newbie here with a warning about Autozones (Wells) TPS
  119. 4100 1990 deville
  120. help with code please
  121. 89 sedan deville hesitation problem--HELP!
  122. Went through my codes today and...(help)
  123. GM Coolant Pellets Do Not Work....
  124. Whats up guys! I really need your help!!
  125. Adjusting the TPS - Right or Wrong?
  126. intermittent miss 4.5 1990 deville
  127. The Surge/Stumble Revisited
  128. 1991 SedanDeVille - "Service Engine Soon" Light
  129. heres where im leaking coolant *pics
  130. TPS wiring Question.
  131. A/C Leak
  132. 91 Eldorado Performance Tips
  133. Steel Rocker Arm Supports
  134. removing oil pan from 92 DeVille
  135. Low RPM ENgine Rough
  136. Exaust question
  137. 4.1 engine questions
  138. 4.9 pushrod length/width?
  139. Rebuild 4.9L thread?
  140. 4.5L replacement for 4.1 in 84 eldo/seville?
  141. 4.9 Manifolds????
  142. 1990 cadillac sedan deville
  143. is my engine shot????
  144. Roaring Rattling Deville
  145. tranny jumping in and out of gears
  146. MAP reading while applying brake
  147. Oil pressure in HT4100?
  148. SERVICE SOON light comes on random, but serviced at dealer last year.
  149. no rad fans 90 deville 4.5
  150. 1990 Deville idle issue
  151. 1st post: Eldorado dies 3 miles after I bought it...HELP!
  152. Need help quick please 4.9 deville
  153. NEED HELP -Stalled 92 Seville STS, won't start
  154. torx
  155. carb removal help urgent
  156. Should I buy it, guys?
  157. 85 FWB stalled out and won't start
  158. Source for sleeves 4.1 4.5 etc
  159. 88 eldo codes but why
  160. 1988 4.5l fwd eats up distributor gears
  161. help! i think i blew it. 4.5 hg
  162. Fuel Guage problem
  163. 4.9 head gaskets fel-pro vs GM
  164. Dead mouse in the heater/ AC box HELP !!!
  165. leaking "fuel filter "??
  166. where does the "gas mileage" sensor collect the data?
  167. 94 deville loss of power
  168. 85 eldo
  169. fuel system problem...i think
  170. HT 4100 flooding out badly. Warm or cold
  171. Are the GM replacemnt 4100's a better design ?
  172. '90 Seville with 4.5 Knocks when warm
  173. 93 Deville Werid Noise
  174. spark plug torque for 1991 4.9
  175. 4.1 Clutch Fan hooped?
  176. 91 DeVille wants to go like crazy! Whats up?
  177. 4.1 Engine seems to be running rich
  178. Injector Failure At 43,000 Miles???
  179. 89 deville runs rough intermittantly??
  180. 4.9 Questions...
  181. new problem arising?
  182. what perfomance mods,if any???
  183. What is the Top mph a 4.9 can hit before it cuts off?
  184. high RPM, ISC not the problem?
  185. Please Help Me!!!
  186. 'hidden Warranties'
  187. 4.1 Serpentine Belt Frozen
  188. 91 caddy deville runs wrong
  189. Transmission service
  190. miss on the 4.5litre?
  191. 90 Deville runs like crap
  192. Why would the NOx increase after my EGR is hooked up?
  193. Failed Smog Test Please Help!!!
  194. 91 DeVille--Problems to Watch For
  195. 4.9 liter oil use?
  196. 90 Deville hesitation after driving for hours
  197. When do u change the O2 sensors?
  198. Does the 4.9 really need 91 octane????
  199. fuel injection parts
  200. Got a VSS code on my 1990 Deville!!
  201. Need help with fuel system
  202. BBOB or ANYONE---A LITTLE HELP!!
  203. ISC motor ratchets after shutoff
  204. 1990 Allante Engine
  205. Fuel Injectors help!!!
  206. Switched Oil and now it clatters!!!!!
  207. Could a catalytic convertor go bad in 2 years?
  208. Anyone tested 4.9's fwhp?
  209. Can't seem to fond the answer.
  210. THROTTLE PROBLEMS 95 DeVILLE 4.9
  211. 89 Deville, What would cause this?
  212. 85 FWB W/ 4100 Hesitation...
  213. 86 Cadillac Deville Timing
  214. 93 seville sls idle problems
  215. 1990 feleetwood codes on air control panel
  216. A few qestions regarding timing, etc.
  217. changing spark plugs
  218. Overheating not block or head 83 Brougham anyone know whats wrong?
  219. injector part number
  220. What are common issues with the 4.9?
  221. need some help
  222. 4.9 Dead - How easy to swap in a 4.5?
  223. A new problem...
  224. Emission Results fine in set timing mode?
  225. Open or closed deck block
  226. 85 Fleetwood Brougham W/ 4100 -- No Start...
  227. Dip Stick Tube
  228. 4.1 v6, 4.1 v8-- What's the differance?
  229. I need a water pump have a couple of questions.
  230. Is the 4.9 Under Rated?
  231. 4.1 Giving 3 codes...Need help
  232. 4.9 Froze
  233. injectors
  234. Collapsed UPPER Rad Hose!
  235. Wow...26+ MPG in a 3900# vehicle with over 700 lbs of cargo/passengers
  236. '84 Eldo Failed NOx
  237. 82 deville vibration
  238. used injectors
  239. Regular gas vs. premium gas
  240. Fuel Injectors
  241. 84 4.1 Eldo
  242. 4.1 ELDO Hesitation and Stall
  243. RE: 82 deville
  244. Whats the best place to find a replacment 4.9
  245. new to the forum - big problem
  246. radiator blew apart
  247. engins problem
  248. Low Oil Pressure Light 1982 eldorado
  249. let the thing blow up??
  250. 82 deville VIBE SOLVED