: HT4100 4.1, 4.5, 4.9



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  1. 1985 deville coolant and heater core questions.
  2. New member here, and I need some '93 Deville help (water pump installation)
  3. 1990 Allante Bosch fuel injectors/FiveOMotorsports
  4. Cleaning '90 EGR 4.5
  5. Groll Polluter FIXED??????????????????
  6. Where does this fuel line run?
  7. 88 Deville.Tensioner Pulley.
  8. 85 4100 is running rough and hesitating
  9. car will not go past 35mph 82 with a 4.1
  10. Does anyone have a picture or info on the Negative block ground?
  11. EGR Cleaning
  12. Cheap quality Rebuilt transmissions
  13. 4.5 Fast Idle problem
  14. I need a no Yo-Yo shift-kit immediately!! '84 RWD DeVille
  15. 93 Runs rough & loud when wet
  16. Spark Plug Replacement
  17. Fuel Injector Compatiblity
  18. Oil pan gasket
  19. No Spark/ No Start Problem/ Pulling what hair I have left out!
  20. oil change
  21. Accel fuel injectors
  22. Alldata (autozone)????????????????????
  23. A/C Compressor
  24. Help ECM E85
  25. Fuel Pumps on '82-85 HT4100 -- Life span??
  26. Analyzing Fuel Economy
  27. Difference between '82 vs '85 Fuel Injectors on the HT4100????
  28. Oil Theories
  29. Got Injectors? 4.9/4.5
  30. E048
  31. Why Wont This Car Start After I Put In A New Alternator.
  32. '85 Throttle Body in an 82 Eldo???
  33. 4.9 knocking
  34. Hole In Muffler(Recommended Replacement)
  35. 91 DeVille
  36. In reguard to my deville's rough idleing,could it just need an induction service?
  37. Code question.
  38. Plugs for 4.9
  39. 1994 Deville 4.9 (Serpentine Belt) - Save Me From the Junk Yard
  40. Inaccurate gas readout?
  41. 1990 Allante fuel injectors
  42. 4.9 with sleeves?
  43. 4.9 Air Cleaner
  44. Stoneage_caddy my deville is stuttering when idleing,any ideas?
  45. 92 4.9 fleetwood high idle
  46. 1994 4.9L won't pass emissions HCs too high How to fix?
  47. HELLO - I'm seeing an error code 52 - any idea what that means?
  48. 4100 Reliability
  49. 1982 eldorado low oiil pressure light on immediately after oil change??
  50. 82 deville VIBE SOLVED
  51. let the thing blow up??
  52. Low Oil Pressure Light 1982 eldorado
  53. engins problem
  54. radiator blew apart
  55. new to the forum - big problem
  56. Whats the best place to find a replacment 4.9
  57. RE: 82 deville
  58. 4.1 ELDO Hesitation and Stall
  59. 84 4.1 Eldo
  60. Fuel Injectors
  61. Regular gas vs. premium gas
  62. used injectors
  63. 82 deville vibration
  64. '84 Eldo Failed NOx
  65. Wow...26+ MPG in a 3900# vehicle with over 700 lbs of cargo/passengers
  66. Collapsed UPPER Rad Hose!
  67. injectors
  68. 4.9 Froze
  69. 4.1 Giving 3 codes...Need help
  70. Is the 4.9 Under Rated?
  71. I need a water pump have a couple of questions.
  72. 4.1 v6, 4.1 v8-- What's the differance?
  73. Dip Stick Tube
  74. 85 Fleetwood Brougham W/ 4100 -- No Start...
  75. Open or closed deck block
  76. Emission Results fine in set timing mode?
  77. A new problem...
  78. 4.9 Dead - How easy to swap in a 4.5?
  79. need some help
  80. What are common issues with the 4.9?
  81. injector part number
  82. Overheating not block or head 83 Brougham anyone know whats wrong?
  83. changing spark plugs
  84. A few qestions regarding timing, etc.
  85. 1990 feleetwood codes on air control panel
  86. 93 seville sls idle problems
  87. 86 Cadillac Deville Timing
  88. 85 FWB W/ 4100 Hesitation...
  89. 89 Deville, What would cause this?
  90. THROTTLE PROBLEMS 95 DeVILLE 4.9
  91. Can't seem to fond the answer.
  92. Anyone tested 4.9's fwhp?
  93. Could a catalytic convertor go bad in 2 years?
  94. Switched Oil and now it clatters!!!!!
  95. Fuel Injectors help!!!
  96. 1990 Allante Engine
  97. ISC motor ratchets after shutoff
  98. BBOB or ANYONE---A LITTLE HELP!!
  99. Need help with fuel system
  100. Got a VSS code on my 1990 Deville!!
  101. fuel injection parts
  102. Does the 4.9 really need 91 octane????
  103. When do u change the O2 sensors?
  104. 90 Deville hesitation after driving for hours
  105. 4.9 liter oil use?
  106. 91 DeVille--Problems to Watch For
  107. Failed Smog Test Please Help!!!
  108. Why would the NOx increase after my EGR is hooked up?
  109. 90 Deville runs like crap
  110. miss on the 4.5litre?
  111. Transmission service
  112. 91 caddy deville runs wrong
  113. 4.1 Serpentine Belt Frozen
  114. 'hidden Warranties'
  115. Please Help Me!!!
  116. high RPM, ISC not the problem?
  117. What is the Top mph a 4.9 can hit before it cuts off?
  118. what perfomance mods,if any???
  119. new problem arising?
  120. 4.9 Questions...
  121. 89 deville runs rough intermittantly??
  122. Injector Failure At 43,000 Miles???
  123. 4.1 Engine seems to be running rich
  124. 91 DeVille wants to go like crazy! Whats up?
  125. 4.1 Clutch Fan hooped?
  126. spark plug torque for 1991 4.9
  127. 93 Deville Werid Noise
  128. '90 Seville with 4.5 Knocks when warm
  129. Are the GM replacemnt 4100's a better design ?
  130. HT 4100 flooding out badly. Warm or cold
  131. fuel system problem...i think
  132. 85 eldo
  133. 94 deville loss of power
  134. where does the "gas mileage" sensor collect the data?
  135. leaking "fuel filter "??
  136. Dead mouse in the heater/ AC box HELP !!!
  137. 4.9 head gaskets fel-pro vs GM
  138. Fuel Guage problem
  139. help! i think i blew it. 4.5 hg
  140. 1988 4.5l fwd eats up distributor gears
  141. 88 eldo codes but why
  142. Source for sleeves 4.1 4.5 etc
  143. 85 FWB stalled out and won't start
  144. Should I buy it, guys?
  145. carb removal help urgent
  146. torx
  147. NEED HELP -Stalled 92 Seville STS, won't start
  148. Need help quick please 4.9 deville
  149. 1st post: Eldorado dies 3 miles after I bought it...HELP!
  150. 1990 Deville idle issue
  151. no rad fans 90 deville 4.5
  152. SERVICE SOON light comes on random, but serviced at dealer last year.
  153. Oil pressure in HT4100?
  154. MAP reading while applying brake
  155. tranny jumping in and out of gears
  156. Roaring Rattling Deville
  157. is my engine shot????
  158. 1990 cadillac sedan deville
  159. 4.9 Manifolds????
  160. 4.5L replacement for 4.1 in 84 eldo/seville?
  161. Rebuild 4.9L thread?
  162. 4.9 pushrod length/width?
  163. 4.1 engine questions
  164. Exaust question
  165. Low RPM ENgine Rough
  166. removing oil pan from 92 DeVille
  167. Steel Rocker Arm Supports
  168. 91 Eldorado Performance Tips
  169. A/C Leak
  170. TPS wiring Question.
  171. heres where im leaking coolant *pics
  172. 1991 SedanDeVille - "Service Engine Soon" Light
  173. The Surge/Stumble Revisited
  174. intermittent miss 4.5 1990 deville
  175. Adjusting the TPS - Right or Wrong?
  176. Whats up guys! I really need your help!!
  177. GM Coolant Pellets Do Not Work....
  178. Went through my codes today and...(help)
  179. 89 sedan deville hesitation problem--HELP!
  180. help with code please
  181. 4100 1990 deville
  182. Newbie here with a warning about Autozones (Wells) TPS
  183. Blown Head Gaskets 4.5 or 4.9 V8
  184. Red Line Water Wetter ?
  185. 4.5 Cooling System Additive
  186. 1987 Cadillac Sedan Deville
  187. My 1986 Cadi engine revs continually
  188. Hey, can anyone help me with this 4.9?
  189. 20w50 5W30 oil,not for use in a 4.9 liter engine?
  190. DeVille (DEVIL?) 91 *extreme* power loss.
  191. 92 Deville will not run with MAP sensor connected
  192. 85 Fleetwood 4.1 (FWD) NO START
  193. How to detect a misfiring cylinder....
  194. Why does '90 4.5L not drop to idle till almost stopped?
  195. start,start,no start
  196. Coolant Fan manual override switch
  197. Finally have my Eldorado back w/extra hp!!
  198. Do you have to change all 8 injectors on a 1992 4.9?
  199. Car overheat real bad when sitting still for 15 minute
  200. Changed Coolant Today!
  201. 4100 rwd deville swap
  202. '89 4.5L, 200k miles, oil leak behind waterpump?
  203. engine code e47
  204. crankcase pressure
  205. codes
  206. What grade of fuel should I use?
  207. Vibration in 1992 4.9!?!?!?!?
  208. engine races when started cold
  209. Look inside the 104k 4.9.... and a new valve cover :)
  210. need more hp!!!!!!
  211. 87 Seville 4.1 smokeing, don't know why.
  212. Rocker arm support installation question.
  213. What happened to my post?
  214. 4.5L timing?
  215. 4.9 Custom Header - Gauging Interest
  216. 95 Deville PO39 code need help!!!!!!!!!
  217. Converter Inlet Size??
  218. throttle switch short
  219. 4100 sleeve selection (rehash?)
  220. Oil change and now the light wont go out.
  221. Is it hard to change the coolant on the 4.1?
  222. Performance parts for caddy 4.9 engine?
  223. 4.9 Custom Air intake
  224. Radiator cap PSI for 4.9
  225. Timing 94 Deville
  226. rough running after warm up
  227. Nitrous in 4.9
  228. Stripped Head Bolt Threads
  229. 83 coupe air pump
  230. Removing cat-converter...good idea or no?
  231. URGENT!! Muffler?
  232. Finally summers here, first problem..brakes stuck
  233. leaking deville 4100 need bandaid
  234. Is 104C too hot for a 4.9L 1994 Deville?
  235. Is There Such A Thing As A Starter Motor Overheating?
  236. Illumina /Bbob/Nodh and other Tech types
  237. Possible Seville Engine Swap
  238. E39 Code
  239. 4.5 Performance?
  240. ht4100 bars leaks crap help
  241. 1990 4.5 needs new injectors
  242. My buddy thought the 4.9 was like 250hp!!
  243. Engine STILL missing (intermittant), tons of work done so far--HELP!!!
  244. rumble in the 'ville
  245. My Caddy won't start.
  246. Code 19....1984 DeVille
  247. Longevity of a 4.9L Is 150K too many miles?
  248. What are the common problem areas with 4.9Ls on 1994 Deville?
  249. Knock
  250. 4.9 straightpipes