: HT4100 4.1, 4.5, 4.9



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