: HT4100 4.1, 4.5, 4.9



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  1. Antifreeze for my HT4100
  2. 1989 Eldorado Biarritz MPG
  3. 1991 deville engine dies when coasting
  4. The Homemade 5 Liter PFI Project .....
  5. 85 seville valve lifters
  6. Blown 4.1 ht in 83 eldorado ?? how to tell ?
  7. Bogging problem
  8. Throttle body problem, help please
  9. I knew I saw it someplace, now where did it go, no not my sanity but close?
  10. 4.5......which sensor is bad?
  11. 4.9 bearing part number or TSB?
  12. Help with HT4100 water pump
  13. which is the better motor
  14. Nitrous Question
  15. 1995 DeVille Idle Fluctuation
  16. issues w/ back pressure?!?
  17. Well the pump is on, but my serpentine belt...what?
  18. 83 Sedan Deville 4100
  19. Its an Invasion 4.9, 5spd Stick Fiero
  20. why I love my 4.5...
  21. 1985 deville coolant and heater core questions.
  22. New member here, and I need some '93 Deville help (water pump installation)
  23. 1990 Allante Bosch fuel injectors/FiveOMotorsports
  24. Cleaning '90 EGR 4.5
  25. Groll Polluter FIXED??????????????????
  26. Where does this fuel line run?
  27. 88 Deville.Tensioner Pulley.
  28. 85 4100 is running rough and hesitating
  29. car will not go past 35mph 82 with a 4.1
  30. Does anyone have a picture or info on the Negative block ground?
  31. EGR Cleaning
  32. Cheap quality Rebuilt transmissions
  33. 4.5 Fast Idle problem
  34. I need a no Yo-Yo shift-kit immediately!! '84 RWD DeVille
  35. 93 Runs rough & loud when wet
  36. Spark Plug Replacement
  37. Fuel Injector Compatiblity
  38. Oil pan gasket
  39. No Spark/ No Start Problem/ Pulling what hair I have left out!
  40. oil change
  41. Accel fuel injectors
  42. Alldata (autozone)????????????????????
  43. A/C Compressor
  44. Help ECM E85
  45. Fuel Pumps on '82-85 HT4100 -- Life span??
  46. Analyzing Fuel Economy
  47. Difference between '82 vs '85 Fuel Injectors on the HT4100????
  48. Oil Theories
  49. Got Injectors? 4.9/4.5
  50. E048
  51. Why Wont This Car Start After I Put In A New Alternator.
  52. '85 Throttle Body in an 82 Eldo???
  53. 4.9 knocking
  54. Hole In Muffler(Recommended Replacement)
  55. 91 DeVille
  56. In reguard to my deville's rough idleing,could it just need an induction service?
  57. Code question.
  58. Plugs for 4.9
  59. 1994 Deville 4.9 (Serpentine Belt) - Save Me From the Junk Yard
  60. Inaccurate gas readout?
  61. 1990 Allante fuel injectors
  62. 4.9 with sleeves?
  63. 4.9 Air Cleaner
  64. Stoneage_caddy my deville is stuttering when idleing,any ideas?
  65. 92 4.9 fleetwood high idle
  66. 1994 4.9L won't pass emissions HCs too high How to fix?
  67. HELLO - I'm seeing an error code 52 - any idea what that means?
  68. 4100 Reliability
  69. 1982 eldorado low oiil pressure light on immediately after oil change??
  70. 82 deville VIBE SOLVED
  71. let the thing blow up??
  72. Low Oil Pressure Light 1982 eldorado
  73. engins problem
  74. radiator blew apart
  75. new to the forum - big problem
  76. Whats the best place to find a replacment 4.9
  77. RE: 82 deville
  78. 4.1 ELDO Hesitation and Stall
  79. 84 4.1 Eldo
  80. Fuel Injectors
  81. Regular gas vs. premium gas
  82. used injectors
  83. 82 deville vibration
  84. '84 Eldo Failed NOx
  85. Wow...26+ MPG in a 3900# vehicle with over 700 lbs of cargo/passengers
  86. Collapsed UPPER Rad Hose!
  87. injectors
  88. 4.9 Froze
  89. 4.1 Giving 3 codes...Need help
  90. Is the 4.9 Under Rated?
  91. I need a water pump have a couple of questions.
  92. 4.1 v6, 4.1 v8-- What's the differance?
  93. Dip Stick Tube
  94. 85 Fleetwood Brougham W/ 4100 -- No Start...
  95. Open or closed deck block
  96. Emission Results fine in set timing mode?
  97. A new problem...
  98. 4.9 Dead - How easy to swap in a 4.5?
  99. need some help
  100. What are common issues with the 4.9?
  101. injector part number
  102. Overheating not block or head 83 Brougham anyone know whats wrong?
  103. changing spark plugs
  104. A few qestions regarding timing, etc.
  105. 1990 feleetwood codes on air control panel
  106. 93 seville sls idle problems
  107. 86 Cadillac Deville Timing
  108. 85 FWB W/ 4100 Hesitation...
  109. 89 Deville, What would cause this?
  110. THROTTLE PROBLEMS 95 DeVILLE 4.9
  111. Can't seem to fond the answer.
  112. Anyone tested 4.9's fwhp?
  113. Could a catalytic convertor go bad in 2 years?
  114. Switched Oil and now it clatters!!!!!
  115. Fuel Injectors help!!!
  116. 1990 Allante Engine
  117. ISC motor ratchets after shutoff
  118. BBOB or ANYONE---A LITTLE HELP!!
  119. Need help with fuel system
  120. Got a VSS code on my 1990 Deville!!
  121. fuel injection parts
  122. Does the 4.9 really need 91 octane????
  123. When do u change the O2 sensors?
  124. 90 Deville hesitation after driving for hours
  125. 4.9 liter oil use?
  126. 91 DeVille--Problems to Watch For
  127. Failed Smog Test Please Help!!!
  128. Why would the NOx increase after my EGR is hooked up?
  129. 90 Deville runs like crap
  130. miss on the 4.5litre?
  131. Transmission service
  132. 91 caddy deville runs wrong
  133. 4.1 Serpentine Belt Frozen
  134. 'hidden Warranties'
  135. Please Help Me!!!
  136. high RPM, ISC not the problem?
  137. What is the Top mph a 4.9 can hit before it cuts off?
  138. what perfomance mods,if any???
  139. new problem arising?
  140. 4.9 Questions...
  141. 89 deville runs rough intermittantly??
  142. Injector Failure At 43,000 Miles???
  143. 4.1 Engine seems to be running rich
  144. 91 DeVille wants to go like crazy! Whats up?
  145. 4.1 Clutch Fan hooped?
  146. spark plug torque for 1991 4.9
  147. 93 Deville Werid Noise
  148. '90 Seville with 4.5 Knocks when warm
  149. Are the GM replacemnt 4100's a better design ?
  150. HT 4100 flooding out badly. Warm or cold
  151. fuel system problem...i think
  152. 85 eldo
  153. 94 deville loss of power
  154. where does the "gas mileage" sensor collect the data?
  155. leaking "fuel filter "??
  156. Dead mouse in the heater/ AC box HELP !!!
  157. 4.9 head gaskets fel-pro vs GM
  158. Fuel Guage problem
  159. help! i think i blew it. 4.5 hg
  160. 1988 4.5l fwd eats up distributor gears
  161. 88 eldo codes but why
  162. Source for sleeves 4.1 4.5 etc
  163. 85 FWB stalled out and won't start
  164. Should I buy it, guys?
  165. carb removal help urgent
  166. torx
  167. NEED HELP -Stalled 92 Seville STS, won't start
  168. Need help quick please 4.9 deville
  169. 1st post: Eldorado dies 3 miles after I bought it...HELP!
  170. 1990 Deville idle issue
  171. no rad fans 90 deville 4.5
  172. SERVICE SOON light comes on random, but serviced at dealer last year.
  173. Oil pressure in HT4100?
  174. MAP reading while applying brake
  175. tranny jumping in and out of gears
  176. Roaring Rattling Deville
  177. is my engine shot????
  178. 1990 cadillac sedan deville
  179. 4.9 Manifolds????
  180. 4.5L replacement for 4.1 in 84 eldo/seville?
  181. Rebuild 4.9L thread?
  182. 4.9 pushrod length/width?
  183. 4.1 engine questions
  184. Exaust question
  185. Low RPM ENgine Rough
  186. removing oil pan from 92 DeVille
  187. Steel Rocker Arm Supports
  188. 91 Eldorado Performance Tips
  189. A/C Leak
  190. TPS wiring Question.
  191. heres where im leaking coolant *pics
  192. 1991 SedanDeVille - "Service Engine Soon" Light
  193. The Surge/Stumble Revisited
  194. intermittent miss 4.5 1990 deville
  195. Adjusting the TPS - Right or Wrong?
  196. Whats up guys! I really need your help!!
  197. GM Coolant Pellets Do Not Work....
  198. Went through my codes today and...(help)
  199. 89 sedan deville hesitation problem--HELP!
  200. help with code please
  201. 4100 1990 deville
  202. Newbie here with a warning about Autozones (Wells) TPS
  203. Blown Head Gaskets 4.5 or 4.9 V8
  204. Red Line Water Wetter ?
  205. 4.5 Cooling System Additive
  206. 1987 Cadillac Sedan Deville
  207. My 1986 Cadi engine revs continually
  208. Hey, can anyone help me with this 4.9?
  209. 20w50 5W30 oil,not for use in a 4.9 liter engine?
  210. DeVille (DEVIL?) 91 *extreme* power loss.
  211. 92 Deville will not run with MAP sensor connected
  212. 85 Fleetwood 4.1 (FWD) NO START
  213. How to detect a misfiring cylinder....
  214. Why does '90 4.5L not drop to idle till almost stopped?
  215. start,start,no start
  216. Coolant Fan manual override switch
  217. Finally have my Eldorado back w/extra hp!!
  218. Do you have to change all 8 injectors on a 1992 4.9?
  219. Car overheat real bad when sitting still for 15 minute
  220. Changed Coolant Today!
  221. 4100 rwd deville swap
  222. '89 4.5L, 200k miles, oil leak behind waterpump?
  223. engine code e47
  224. crankcase pressure
  225. codes
  226. What grade of fuel should I use?
  227. Vibration in 1992 4.9!?!?!?!?
  228. engine races when started cold
  229. Look inside the 104k 4.9.... and a new valve cover :)
  230. need more hp!!!!!!
  231. 87 Seville 4.1 smokeing, don't know why.
  232. Rocker arm support installation question.
  233. What happened to my post?
  234. 4.5L timing?
  235. 4.9 Custom Header - Gauging Interest
  236. 95 Deville PO39 code need help!!!!!!!!!
  237. Converter Inlet Size??
  238. throttle switch short
  239. 4100 sleeve selection (rehash?)
  240. Oil change and now the light wont go out.
  241. Is it hard to change the coolant on the 4.1?
  242. Performance parts for caddy 4.9 engine?
  243. 4.9 Custom Air intake
  244. Radiator cap PSI for 4.9
  245. Timing 94 Deville
  246. rough running after warm up
  247. Nitrous in 4.9
  248. Stripped Head Bolt Threads
  249. 83 coupe air pump
  250. Removing cat-converter...good idea or no?