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View Full Version : HT4100 4.1, 4.5, 4.9

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  1. 4.9 liter oil use?
  2. 91 DeVille--Problems to Watch For
  3. Failed Smog Test Please Help!!!
  4. Why would the NOx increase after my EGR is hooked up?
  5. 90 Deville runs like crap
  6. miss on the 4.5litre?
  7. Transmission service
  8. 91 caddy deville runs wrong
  9. 4.1 Serpentine Belt Frozen
  10. 'hidden Warranties'
  11. Please Help Me!!!
  12. high RPM, ISC not the problem?
  13. What is the Top mph a 4.9 can hit before it cuts off?
  14. what perfomance mods,if any???
  15. new problem arising?
  16. 4.9 Questions...
  17. 89 deville runs rough intermittantly??
  18. Injector Failure At 43,000 Miles???
  19. 4.1 Engine seems to be running rich
  20. 91 DeVille wants to go like crazy! Whats up?
  21. 4.1 Clutch Fan hooped?
  22. spark plug torque for 1991 4.9
  23. 93 Deville Werid Noise
  24. '90 Seville with 4.5 Knocks when warm
  25. Are the GM replacemnt 4100's a better design ?
  26. HT 4100 flooding out badly. Warm or cold
  27. fuel system problem...i think
  28. 85 eldo
  29. 94 deville loss of power
  30. where does the "gas mileage" sensor collect the data?
  31. leaking "fuel filter "??
  32. Dead mouse in the heater/ AC box HELP !!!
  33. 4.9 head gaskets fel-pro vs GM
  34. Fuel Guage problem
  35. help! i think i blew it. 4.5 hg
  36. 1988 4.5l fwd eats up distributor gears
  37. 88 eldo codes but why
  38. Source for sleeves 4.1 4.5 etc
  39. 85 FWB stalled out and won't start
  40. Should I buy it, guys?
  41. carb removal help urgent
  42. torx
  43. NEED HELP -Stalled 92 Seville STS, won't start
  44. Need help quick please 4.9 deville
  45. 1st post: Eldorado dies 3 miles after I bought it...HELP!
  46. 1990 Deville idle issue
  47. no rad fans 90 deville 4.5
  48. SERVICE SOON light comes on random, but serviced at dealer last year.
  49. Oil pressure in HT4100?
  50. MAP reading while applying brake
  51. tranny jumping in and out of gears
  52. Roaring Rattling Deville
  53. is my engine shot????
  54. 1990 cadillac sedan deville
  55. 4.9 Manifolds????
  56. 4.5L replacement for 4.1 in 84 eldo/seville?
  57. Rebuild 4.9L thread?
  58. 4.9 pushrod length/width?
  59. 4.1 engine questions
  60. Exaust question
  61. Low RPM ENgine Rough
  62. removing oil pan from 92 DeVille
  63. Steel Rocker Arm Supports
  64. 91 Eldorado Performance Tips
  65. A/C Leak
  66. TPS wiring Question.
  67. heres where im leaking coolant *pics
  68. 1991 SedanDeVille - "Service Engine Soon" Light
  69. The Surge/Stumble Revisited
  70. intermittent miss 4.5 1990 deville
  71. Adjusting the TPS - Right or Wrong?
  72. Whats up guys! I really need your help!!
  73. GM Coolant Pellets Do Not Work....
  74. Went through my codes today and...(help)
  75. 89 sedan deville hesitation problem--HELP!
  76. help with code please
  77. 4100 1990 deville
  78. Newbie here with a warning about Autozones (Wells) TPS
  79. Blown Head Gaskets 4.5 or 4.9 V8
  80. Red Line Water Wetter ?
  81. 4.5 Cooling System Additive
  82. 1987 Cadillac Sedan Deville
  83. My 1986 Cadi engine revs continually
  84. Hey, can anyone help me with this 4.9?
  85. 20w50 5W30 oil,not for use in a 4.9 liter engine?
  86. DeVille (DEVIL?) 91 *extreme* power loss.
  87. 92 Deville will not run with MAP sensor connected
  88. 85 Fleetwood 4.1 (FWD) NO START
  89. How to detect a misfiring cylinder....
  90. Why does '90 4.5L not drop to idle till almost stopped?
  91. start,start,no start
  92. Coolant Fan manual override switch
  93. Finally have my Eldorado back w/extra hp!!
  94. Do you have to change all 8 injectors on a 1992 4.9?
  95. Car overheat real bad when sitting still for 15 minute
  96. Changed Coolant Today!
  97. 4100 rwd deville swap
  98. '89 4.5L, 200k miles, oil leak behind waterpump?
  99. engine code e47
  100. crankcase pressure
  101. codes
  102. What grade of fuel should I use?
  103. Vibration in 1992 4.9!?!?!?!?
  104. engine races when started cold
  105. Look inside the 104k 4.9.... and a new valve cover :)
  106. need more hp!!!!!!
  107. 87 Seville 4.1 smokeing, don't know why.
  108. Rocker arm support installation question.
  109. What happened to my post?
  110. 4.5L timing?
  111. 4.9 Custom Header - Gauging Interest
  112. 95 Deville PO39 code need help!!!!!!!!!
  113. Converter Inlet Size??
  114. throttle switch short
  115. 4100 sleeve selection (rehash?)
  116. Oil change and now the light wont go out.
  117. Is it hard to change the coolant on the 4.1?
  118. Performance parts for caddy 4.9 engine?
  119. 4.9 Custom Air intake
  120. Radiator cap PSI for 4.9
  121. Timing 94 Deville
  122. rough running after warm up
  123. Nitrous in 4.9
  124. Stripped Head Bolt Threads
  125. 83 coupe air pump
  126. Removing cat-converter...good idea or no?
  127. URGENT!! Muffler?
  128. Finally summers here, first problem..brakes stuck
  129. leaking deville 4100 need bandaid
  130. Is 104C too hot for a 4.9L 1994 Deville?
  131. Is There Such A Thing As A Starter Motor Overheating?
  132. Illumina /Bbob/Nodh and other Tech types
  133. Possible Seville Engine Swap
  134. E39 Code
  135. 4.5 Performance?
  136. ht4100 bars leaks crap help
  137. 1990 4.5 needs new injectors
  138. My buddy thought the 4.9 was like 250hp!!
  139. Engine STILL missing (intermittant), tons of work done so far--HELP!!!
  140. rumble in the 'ville
  141. My Caddy won't start.
  142. Code 19....1984 DeVille
  143. Longevity of a 4.9L Is 150K too many miles?
  144. What are the common problem areas with 4.9Ls on 1994 Deville?
  145. Knock
  146. 4.9 straightpipes
  147. how common are coolant leaks in 4.9
  148. transmission trouble
  149. 1985 HT 4100 Cast Iron Block & Head???
  150. 93 Deville Idle Sticking
  151. Stuck with a HT4100? I have the solution!
  152. 4.9 problems
  153. Tranny Cooler Part Numbers:92 ETC
  154. 85 HT4100 Swap
  155. Engine knocking
  156. Oil leak (Bbob)
  157. Ht4100 Idle
  158. Any advice on a HT4100 while I'm fixing the timing chain/gears?
  159. dumbass in need of help
  160. HT4100 Idle speed (warmed up)?
  161. Transmission lags the downshifts + sometimes upshifts after high speed drive
  162. Changing Engine Coolant
  163. P085 ....... Idle Throttle Angle Too High
  164. serpantine belt problem, 92 deville
  165. Are You Sure Rotella Is good for the 4.9?
  166. antifreeze in oil please help bbob and all
  167. 89 STS torques to one side
  168. 88 eldorado 4.5 help please
  169. 4.9 water pump bolting question?
  170. 1992 Cadillac Sedan DeVille O2 Sensors
  171. 90 Eldo w/4.5 PROJECT CAR - Advice Desired
  172. fuel injector question
  173. It's the smog pump
  174. Removing/Reinstalling Accelerator Pedal
  175. Risks of Ethanol?
  176. 4.1 compression
  177. replaced water pump/wont start
  178. proper oil for 88 sedan deville
  179. Warmed up engine FLOWMASTER 40series DELTA FLOW clip
  180. Brake cleaner - does it miff the engine gaskets?
  181. 94 Deville 4.9L ...P030 and some other codes....
  182. New to the forum....
  183. Who sells a good CA legal catalytic conv. ?? - We have very strict Smog tests here.
  184. Are these holes in the airfilter housing supposed to have something... '84 HT4100 TBI
  185. New Deville Clips
  186. 84 cadillac seville chargeing problem
  187. 1992 sedan deville head gaskets?
  188. 92 Deville Starter heat shied
  189. 4.5 intake gasket
  190. VSS location?
  191. How do you Remove&Clean Throttle Body, engines too big to see back there.
  192. No More Poop On Coupe ! Yea !
  193. 88 eldo 4.5 running temp and code E027 ?'s
  194. 93 Seville radiator fan
  195. PO41 No Cam reference Signal - broke down on trip
  196. Is the exhaust layout identical per the 1983 and 1984 DeVille 4.1 V8
  197. Aftermarket Cat
  198. Why doesn't an '84 DeVille F'ING show up on most of the online catalogs?
  199. What's the most universal oil filter wrench you have used?
  200. 91' deville
  201. 90 deville water pump?
  202. time for a tune up.. whats involved.
  203. Oil Pressure Light just came on - 4.1 V-8!
  204. CAN you change oil filter withOUT draining oil pan?
  205. 83 coupe 4100 ( 4.1) injector problems
  206. Slow Battery Drain
  207. 4.5 liter misfiring on acceleration, rough idle
  208. HT4100 EGR schematics needed to figure out smog issue, BAD F'ING NEWS
  209. Change of Plans! I'm not supercharging anything...
  210. torque convertors for teh 4t60
  211. BARO on 4.9?
  212. Knocking/Rattling From Engine
  213. injector duty cycle
  214. Dangers of flsuhing HT4100 with motor Flush and Supertech oil.
  215. Fuel pressure
  216. Newbie needs help with 87 seville 4.1L
  217. Can A 4.1 Trans be Used in a Long?...
  218. anyone know????
  219. 4.1 wiring from distributor to plugs HELP ASAP
  220. 84 Eldorado 4.1 V8 (HT4100) "E" engine, M57 tranny, Noise from lower end
  221. remove power steering pulley
  222. coolant temperature
  223. GM Reliability Testing?
  224. 84 SDV RWD 4.1 Intake gasket
  225. Is single 3" exhaust too big for a 4.1L @ 200 HP?
  226. Fuel Injector Replacement
  227. HELP!! 91 Eldo stalling problem
  228. used E C M ... from junk yard
  229. How much booooooooost PSI can these 4.1's take? What gives in under pressure?
  230. Bad ECU?(BBOB)
  231. WHAT THE **** IS EVERYONE's FAVORITE MUFFLER/CAT Pipe SETUP?
  232. 4.9 oil pump in 4.5?
  233. does ECU prevent engine braking
  234. What The Hell Is That Thing!?!?!?!
  235. Cleaning and tune up junk on an 88 4.5L deville
  236. 1990 Deville won't start HELP
  237. What kind of Exhaust systems do the 84 SDV 4.1Liter motors like to breath through?
  238. Took a Vid in my 91 Deville
  239. Knocking in the 4.9
  240. 94 deville questions
  241. Best way to flush system (84 HT4100 SDV)
  242. Info on GM Goodwrench replacement engine, HT4100
  243. And Yet Another ISC Motor Question
  244. Car has no spark
  245. idle rpm
  246. Oil leak
  247. 1990 4.5l air system problem
  248. Oxygen Sensor Broke?
  249. plug wires??
  250. isc motor question