: HT4100 4.1, 4.5, 4.9



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  1. Camshaft lifter questions
  2. exhaust manifold
  3. 4.5L ECM inputs
  4. Why I hate NTK Oxy Sensors from Now ON.
  5. Coolant pellets/conditoner
  6. Prob with 86 deville sedan with 4.9L *HELP*
  7. Ported vacuum switch--supposed to have a wire connected to it?
  8. 4.9L Aluminum Head project?
  9. Stoneage_caddy I had my car's fuel preasure checked today,have a couple of questions
  10. Anyone running an Auto meter Air/Fuel Ratio meter.
  11. What O2 sensor(s) are you using.
  12. antifreeze for my 85 fleetwoods ht4100
  13. Antifreeze for my HT4100
  14. 1989 Eldorado Biarritz MPG
  15. 1991 deville engine dies when coasting
  16. The Homemade 5 Liter PFI Project .....
  17. 85 seville valve lifters
  18. Blown 4.1 ht in 83 eldorado ?? how to tell ?
  19. Bogging problem
  20. Throttle body problem, help please
  21. I knew I saw it someplace, now where did it go, no not my sanity but close?
  22. 4.5......which sensor is bad?
  23. 4.9 bearing part number or TSB?
  24. Help with HT4100 water pump
  25. which is the better motor
  26. Nitrous Question
  27. 1995 DeVille Idle Fluctuation
  28. issues w/ back pressure?!?
  29. Well the pump is on, but my serpentine belt...what?
  30. 83 Sedan Deville 4100
  31. Its an Invasion 4.9, 5spd Stick Fiero
  32. why I love my 4.5...
  33. 1985 deville coolant and heater core questions.
  34. New member here, and I need some '93 Deville help (water pump installation)
  35. 1990 Allante Bosch fuel injectors/FiveOMotorsports
  36. Cleaning '90 EGR 4.5
  37. Groll Polluter FIXED??????????????????
  38. Where does this fuel line run?
  39. 88 Deville.Tensioner Pulley.
  40. 85 4100 is running rough and hesitating
  41. car will not go past 35mph 82 with a 4.1
  42. Does anyone have a picture or info on the Negative block ground?
  43. EGR Cleaning
  44. Cheap quality Rebuilt transmissions
  45. 4.5 Fast Idle problem
  46. I need a no Yo-Yo shift-kit immediately!! '84 RWD DeVille
  47. 93 Runs rough & loud when wet
  48. Spark Plug Replacement
  49. Fuel Injector Compatiblity
  50. Oil pan gasket
  51. No Spark/ No Start Problem/ Pulling what hair I have left out!
  52. oil change
  53. Accel fuel injectors
  54. Alldata (autozone)????????????????????
  55. A/C Compressor
  56. Help ECM E85
  57. Fuel Pumps on '82-85 HT4100 -- Life span??
  58. Analyzing Fuel Economy
  59. Difference between '82 vs '85 Fuel Injectors on the HT4100????
  60. Oil Theories
  61. Got Injectors? 4.9/4.5
  62. E048
  63. Why Wont This Car Start After I Put In A New Alternator.
  64. '85 Throttle Body in an 82 Eldo???
  65. 4.9 knocking
  66. Hole In Muffler(Recommended Replacement)
  67. 91 DeVille
  68. In reguard to my deville's rough idleing,could it just need an induction service?
  69. Code question.
  70. Plugs for 4.9
  71. 1994 Deville 4.9 (Serpentine Belt) - Save Me From the Junk Yard
  72. Inaccurate gas readout?
  73. 1990 Allante fuel injectors
  74. 4.9 with sleeves?
  75. 4.9 Air Cleaner
  76. Stoneage_caddy my deville is stuttering when idleing,any ideas?
  77. 92 4.9 fleetwood high idle
  78. 1994 4.9L won't pass emissions HCs too high How to fix?
  79. HELLO - I'm seeing an error code 52 - any idea what that means?
  80. 4100 Reliability
  81. 1982 eldorado low oiil pressure light on immediately after oil change??
  82. 82 deville VIBE SOLVED
  83. let the thing blow up??
  84. Low Oil Pressure Light 1982 eldorado
  85. engins problem
  86. radiator blew apart
  87. new to the forum - big problem
  88. Whats the best place to find a replacment 4.9
  89. RE: 82 deville
  90. 4.1 ELDO Hesitation and Stall
  91. 84 4.1 Eldo
  92. Fuel Injectors
  93. Regular gas vs. premium gas
  94. used injectors
  95. 82 deville vibration
  96. '84 Eldo Failed NOx
  97. Wow...26+ MPG in a 3900# vehicle with over 700 lbs of cargo/passengers
  98. Collapsed UPPER Rad Hose!
  99. injectors
  100. 4.9 Froze
  101. 4.1 Giving 3 codes...Need help
  102. Is the 4.9 Under Rated?
  103. I need a water pump have a couple of questions.
  104. 4.1 v6, 4.1 v8-- What's the differance?
  105. Dip Stick Tube
  106. 85 Fleetwood Brougham W/ 4100 -- No Start...
  107. Open or closed deck block
  108. Emission Results fine in set timing mode?
  109. A new problem...
  110. 4.9 Dead - How easy to swap in a 4.5?
  111. need some help
  112. What are common issues with the 4.9?
  113. injector part number
  114. Overheating not block or head 83 Brougham anyone know whats wrong?
  115. changing spark plugs
  116. A few qestions regarding timing, etc.
  117. 1990 feleetwood codes on air control panel
  118. 93 seville sls idle problems
  119. 86 Cadillac Deville Timing
  120. 85 FWB W/ 4100 Hesitation...
  121. 89 Deville, What would cause this?
  122. THROTTLE PROBLEMS 95 DeVILLE 4.9
  123. Can't seem to fond the answer.
  124. Anyone tested 4.9's fwhp?
  125. Could a catalytic convertor go bad in 2 years?
  126. Switched Oil and now it clatters!!!!!
  127. Fuel Injectors help!!!
  128. 1990 Allante Engine
  129. ISC motor ratchets after shutoff
  130. BBOB or ANYONE---A LITTLE HELP!!
  131. Need help with fuel system
  132. Got a VSS code on my 1990 Deville!!
  133. fuel injection parts
  134. Does the 4.9 really need 91 octane????
  135. When do u change the O2 sensors?
  136. 90 Deville hesitation after driving for hours
  137. 4.9 liter oil use?
  138. 91 DeVille--Problems to Watch For
  139. Failed Smog Test Please Help!!!
  140. Why would the NOx increase after my EGR is hooked up?
  141. 90 Deville runs like crap
  142. miss on the 4.5litre?
  143. Transmission service
  144. 91 caddy deville runs wrong
  145. 4.1 Serpentine Belt Frozen
  146. 'hidden Warranties'
  147. Please Help Me!!!
  148. high RPM, ISC not the problem?
  149. What is the Top mph a 4.9 can hit before it cuts off?
  150. what perfomance mods,if any???
  151. new problem arising?
  152. 4.9 Questions...
  153. 89 deville runs rough intermittantly??
  154. Injector Failure At 43,000 Miles???
  155. 4.1 Engine seems to be running rich
  156. 91 DeVille wants to go like crazy! Whats up?
  157. 4.1 Clutch Fan hooped?
  158. spark plug torque for 1991 4.9
  159. 93 Deville Werid Noise
  160. '90 Seville with 4.5 Knocks when warm
  161. Are the GM replacemnt 4100's a better design ?
  162. HT 4100 flooding out badly. Warm or cold
  163. fuel system problem...i think
  164. 85 eldo
  165. 94 deville loss of power
  166. where does the "gas mileage" sensor collect the data?
  167. leaking "fuel filter "??
  168. Dead mouse in the heater/ AC box HELP !!!
  169. 4.9 head gaskets fel-pro vs GM
  170. Fuel Guage problem
  171. help! i think i blew it. 4.5 hg
  172. 1988 4.5l fwd eats up distributor gears
  173. 88 eldo codes but why
  174. Source for sleeves 4.1 4.5 etc
  175. 85 FWB stalled out and won't start
  176. Should I buy it, guys?
  177. carb removal help urgent
  178. torx
  179. NEED HELP -Stalled 92 Seville STS, won't start
  180. Need help quick please 4.9 deville
  181. 1st post: Eldorado dies 3 miles after I bought it...HELP!
  182. 1990 Deville idle issue
  183. no rad fans 90 deville 4.5
  184. SERVICE SOON light comes on random, but serviced at dealer last year.
  185. Oil pressure in HT4100?
  186. MAP reading while applying brake
  187. tranny jumping in and out of gears
  188. Roaring Rattling Deville
  189. is my engine shot????
  190. 1990 cadillac sedan deville
  191. 4.9 Manifolds????
  192. 4.5L replacement for 4.1 in 84 eldo/seville?
  193. Rebuild 4.9L thread?
  194. 4.9 pushrod length/width?
  195. 4.1 engine questions
  196. Exaust question
  197. Low RPM ENgine Rough
  198. removing oil pan from 92 DeVille
  199. Steel Rocker Arm Supports
  200. 91 Eldorado Performance Tips
  201. A/C Leak
  202. TPS wiring Question.
  203. heres where im leaking coolant *pics
  204. 1991 SedanDeVille - "Service Engine Soon" Light
  205. The Surge/Stumble Revisited
  206. intermittent miss 4.5 1990 deville
  207. Adjusting the TPS - Right or Wrong?
  208. Whats up guys! I really need your help!!
  209. GM Coolant Pellets Do Not Work....
  210. Went through my codes today and...(help)
  211. 89 sedan deville hesitation problem--HELP!
  212. help with code please
  213. 4100 1990 deville
  214. Newbie here with a warning about Autozones (Wells) TPS
  215. Blown Head Gaskets 4.5 or 4.9 V8
  216. Red Line Water Wetter ?
  217. 4.5 Cooling System Additive
  218. 1987 Cadillac Sedan Deville
  219. My 1986 Cadi engine revs continually
  220. Hey, can anyone help me with this 4.9?
  221. 20w50 5W30 oil,not for use in a 4.9 liter engine?
  222. DeVille (DEVIL?) 91 *extreme* power loss.
  223. 92 Deville will not run with MAP sensor connected
  224. 85 Fleetwood 4.1 (FWD) NO START
  225. How to detect a misfiring cylinder....
  226. Why does '90 4.5L not drop to idle till almost stopped?
  227. start,start,no start
  228. Coolant Fan manual override switch
  229. Finally have my Eldorado back w/extra hp!!
  230. Do you have to change all 8 injectors on a 1992 4.9?
  231. Car overheat real bad when sitting still for 15 minute
  232. Changed Coolant Today!
  233. 4100 rwd deville swap
  234. '89 4.5L, 200k miles, oil leak behind waterpump?
  235. engine code e47
  236. crankcase pressure
  237. codes
  238. What grade of fuel should I use?
  239. Vibration in 1992 4.9!?!?!?!?
  240. engine races when started cold
  241. Look inside the 104k 4.9.... and a new valve cover :)
  242. need more hp!!!!!!
  243. 87 Seville 4.1 smokeing, don't know why.
  244. Rocker arm support installation question.
  245. What happened to my post?
  246. 4.5L timing?
  247. 4.9 Custom Header - Gauging Interest
  248. 95 Deville PO39 code need help!!!!!!!!!
  249. Converter Inlet Size??
  250. throttle switch short