: HT4100 4.1, 4.5, 4.9



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  1. E Codes on my 4.5 HELP
  2. E39 and E48 codes could I get some advice?
  3. Can anything go wrong/Flushing coolant?
  4. Another way to pull codes?
  5. Camshaft lifter questions
  6. exhaust manifold
  7. 4.5L ECM inputs
  8. Why I hate NTK Oxy Sensors from Now ON.
  9. Coolant pellets/conditoner
  10. Prob with 86 deville sedan with 4.9L *HELP*
  11. Ported vacuum switch--supposed to have a wire connected to it?
  12. 4.9L Aluminum Head project?
  13. Stoneage_caddy I had my car's fuel preasure checked today,have a couple of questions
  14. Anyone running an Auto meter Air/Fuel Ratio meter.
  15. What O2 sensor(s) are you using.
  16. antifreeze for my 85 fleetwoods ht4100
  17. Antifreeze for my HT4100
  18. 1989 Eldorado Biarritz MPG
  19. 1991 deville engine dies when coasting
  20. The Homemade 5 Liter PFI Project .....
  21. 85 seville valve lifters
  22. Blown 4.1 ht in 83 eldorado ?? how to tell ?
  23. Bogging problem
  24. Throttle body problem, help please
  25. I knew I saw it someplace, now where did it go, no not my sanity but close?
  26. 4.5......which sensor is bad?
  27. 4.9 bearing part number or TSB?
  28. Help with HT4100 water pump
  29. which is the better motor
  30. Nitrous Question
  31. 1995 DeVille Idle Fluctuation
  32. issues w/ back pressure?!?
  33. Well the pump is on, but my serpentine belt...what?
  34. 83 Sedan Deville 4100
  35. Its an Invasion 4.9, 5spd Stick Fiero
  36. why I love my 4.5...
  37. 1985 deville coolant and heater core questions.
  38. New member here, and I need some '93 Deville help (water pump installation)
  39. 1990 Allante Bosch fuel injectors/FiveOMotorsports
  40. Cleaning '90 EGR 4.5
  41. Groll Polluter FIXED??????????????????
  42. Where does this fuel line run?
  43. 88 Deville.Tensioner Pulley.
  44. 85 4100 is running rough and hesitating
  45. car will not go past 35mph 82 with a 4.1
  46. Does anyone have a picture or info on the Negative block ground?
  47. EGR Cleaning
  48. Cheap quality Rebuilt transmissions
  49. 4.5 Fast Idle problem
  50. I need a no Yo-Yo shift-kit immediately!! '84 RWD DeVille
  51. 93 Runs rough & loud when wet
  52. Spark Plug Replacement
  53. Fuel Injector Compatiblity
  54. Oil pan gasket
  55. No Spark/ No Start Problem/ Pulling what hair I have left out!
  56. oil change
  57. Accel fuel injectors
  58. Alldata (autozone)????????????????????
  59. A/C Compressor
  60. Help ECM E85
  61. Fuel Pumps on '82-85 HT4100 -- Life span??
  62. Analyzing Fuel Economy
  63. Difference between '82 vs '85 Fuel Injectors on the HT4100????
  64. Oil Theories
  65. Got Injectors? 4.9/4.5
  66. E048
  67. Why Wont This Car Start After I Put In A New Alternator.
  68. '85 Throttle Body in an 82 Eldo???
  69. 4.9 knocking
  70. Hole In Muffler(Recommended Replacement)
  71. 91 DeVille
  72. In reguard to my deville's rough idleing,could it just need an induction service?
  73. Code question.
  74. Plugs for 4.9
  75. 1994 Deville 4.9 (Serpentine Belt) - Save Me From the Junk Yard
  76. Inaccurate gas readout?
  77. 1990 Allante fuel injectors
  78. 4.9 with sleeves?
  79. 4.9 Air Cleaner
  80. Stoneage_caddy my deville is stuttering when idleing,any ideas?
  81. 92 4.9 fleetwood high idle
  82. 1994 4.9L won't pass emissions HCs too high How to fix?
  83. HELLO - I'm seeing an error code 52 - any idea what that means?
  84. 4100 Reliability
  85. 1982 eldorado low oiil pressure light on immediately after oil change??
  86. 82 deville VIBE SOLVED
  87. let the thing blow up??
  88. Low Oil Pressure Light 1982 eldorado
  89. engins problem
  90. radiator blew apart
  91. new to the forum - big problem
  92. Whats the best place to find a replacment 4.9
  93. RE: 82 deville
  94. 4.1 ELDO Hesitation and Stall
  95. 84 4.1 Eldo
  96. Fuel Injectors
  97. Regular gas vs. premium gas
  98. used injectors
  99. 82 deville vibration
  100. '84 Eldo Failed NOx
  101. Wow...26+ MPG in a 3900# vehicle with over 700 lbs of cargo/passengers
  102. Collapsed UPPER Rad Hose!
  103. injectors
  104. 4.9 Froze
  105. 4.1 Giving 3 codes...Need help
  106. Is the 4.9 Under Rated?
  107. I need a water pump have a couple of questions.
  108. 4.1 v6, 4.1 v8-- What's the differance?
  109. Dip Stick Tube
  110. 85 Fleetwood Brougham W/ 4100 -- No Start...
  111. Open or closed deck block
  112. Emission Results fine in set timing mode?
  113. A new problem...
  114. 4.9 Dead - How easy to swap in a 4.5?
  115. need some help
  116. What are common issues with the 4.9?
  117. injector part number
  118. Overheating not block or head 83 Brougham anyone know whats wrong?
  119. changing spark plugs
  120. A few qestions regarding timing, etc.
  121. 1990 feleetwood codes on air control panel
  122. 93 seville sls idle problems
  123. 86 Cadillac Deville Timing
  124. 85 FWB W/ 4100 Hesitation...
  125. 89 Deville, What would cause this?
  126. THROTTLE PROBLEMS 95 DeVILLE 4.9
  127. Can't seem to fond the answer.
  128. Anyone tested 4.9's fwhp?
  129. Could a catalytic convertor go bad in 2 years?
  130. Switched Oil and now it clatters!!!!!
  131. Fuel Injectors help!!!
  132. 1990 Allante Engine
  133. ISC motor ratchets after shutoff
  134. BBOB or ANYONE---A LITTLE HELP!!
  135. Need help with fuel system
  136. Got a VSS code on my 1990 Deville!!
  137. fuel injection parts
  138. Does the 4.9 really need 91 octane????
  139. When do u change the O2 sensors?
  140. 90 Deville hesitation after driving for hours
  141. 4.9 liter oil use?
  142. 91 DeVille--Problems to Watch For
  143. Failed Smog Test Please Help!!!
  144. Why would the NOx increase after my EGR is hooked up?
  145. 90 Deville runs like crap
  146. miss on the 4.5litre?
  147. Transmission service
  148. 91 caddy deville runs wrong
  149. 4.1 Serpentine Belt Frozen
  150. 'hidden Warranties'
  151. Please Help Me!!!
  152. high RPM, ISC not the problem?
  153. What is the Top mph a 4.9 can hit before it cuts off?
  154. what perfomance mods,if any???
  155. new problem arising?
  156. 4.9 Questions...
  157. 89 deville runs rough intermittantly??
  158. Injector Failure At 43,000 Miles???
  159. 4.1 Engine seems to be running rich
  160. 91 DeVille wants to go like crazy! Whats up?
  161. 4.1 Clutch Fan hooped?
  162. spark plug torque for 1991 4.9
  163. 93 Deville Werid Noise
  164. '90 Seville with 4.5 Knocks when warm
  165. Are the GM replacemnt 4100's a better design ?
  166. HT 4100 flooding out badly. Warm or cold
  167. fuel system problem...i think
  168. 85 eldo
  169. 94 deville loss of power
  170. where does the "gas mileage" sensor collect the data?
  171. leaking "fuel filter "??
  172. Dead mouse in the heater/ AC box HELP !!!
  173. 4.9 head gaskets fel-pro vs GM
  174. Fuel Guage problem
  175. help! i think i blew it. 4.5 hg
  176. 1988 4.5l fwd eats up distributor gears
  177. 88 eldo codes but why
  178. Source for sleeves 4.1 4.5 etc
  179. 85 FWB stalled out and won't start
  180. Should I buy it, guys?
  181. carb removal help urgent
  182. torx
  183. NEED HELP -Stalled 92 Seville STS, won't start
  184. Need help quick please 4.9 deville
  185. 1st post: Eldorado dies 3 miles after I bought it...HELP!
  186. 1990 Deville idle issue
  187. no rad fans 90 deville 4.5
  188. SERVICE SOON light comes on random, but serviced at dealer last year.
  189. Oil pressure in HT4100?
  190. MAP reading while applying brake
  191. tranny jumping in and out of gears
  192. Roaring Rattling Deville
  193. is my engine shot????
  194. 1990 cadillac sedan deville
  195. 4.9 Manifolds????
  196. 4.5L replacement for 4.1 in 84 eldo/seville?
  197. Rebuild 4.9L thread?
  198. 4.9 pushrod length/width?
  199. 4.1 engine questions
  200. Exaust question
  201. Low RPM ENgine Rough
  202. removing oil pan from 92 DeVille
  203. Steel Rocker Arm Supports
  204. 91 Eldorado Performance Tips
  205. A/C Leak
  206. TPS wiring Question.
  207. heres where im leaking coolant *pics
  208. 1991 SedanDeVille - "Service Engine Soon" Light
  209. The Surge/Stumble Revisited
  210. intermittent miss 4.5 1990 deville
  211. Adjusting the TPS - Right or Wrong?
  212. Whats up guys! I really need your help!!
  213. GM Coolant Pellets Do Not Work....
  214. Went through my codes today and...(help)
  215. 89 sedan deville hesitation problem--HELP!
  216. help with code please
  217. 4100 1990 deville
  218. Newbie here with a warning about Autozones (Wells) TPS
  219. Blown Head Gaskets 4.5 or 4.9 V8
  220. Red Line Water Wetter ?
  221. 4.5 Cooling System Additive
  222. 1987 Cadillac Sedan Deville
  223. My 1986 Cadi engine revs continually
  224. Hey, can anyone help me with this 4.9?
  225. 20w50 5W30 oil,not for use in a 4.9 liter engine?
  226. DeVille (DEVIL?) 91 *extreme* power loss.
  227. 92 Deville will not run with MAP sensor connected
  228. 85 Fleetwood 4.1 (FWD) NO START
  229. How to detect a misfiring cylinder....
  230. Why does '90 4.5L not drop to idle till almost stopped?
  231. start,start,no start
  232. Coolant Fan manual override switch
  233. Finally have my Eldorado back w/extra hp!!
  234. Do you have to change all 8 injectors on a 1992 4.9?
  235. Car overheat real bad when sitting still for 15 minute
  236. Changed Coolant Today!
  237. 4100 rwd deville swap
  238. '89 4.5L, 200k miles, oil leak behind waterpump?
  239. engine code e47
  240. crankcase pressure
  241. codes
  242. What grade of fuel should I use?
  243. Vibration in 1992 4.9!?!?!?!?
  244. engine races when started cold
  245. Look inside the 104k 4.9.... and a new valve cover :)
  246. need more hp!!!!!!
  247. 87 Seville 4.1 smokeing, don't know why.
  248. Rocker arm support installation question.
  249. What happened to my post?
  250. 4.5L timing?