: HT4100 4.1, 4.5, 4.9



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