: HT4100 4.1, 4.5, 4.9



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