: HT4100 4.1, 4.5, 4.9



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  1. Do I have to change coolant?
  2. 1990 4.5L Eldroado Engine running rough
  3. 4.9 speed limiter...
  4. Is this the right stuff, going to attempt this weekend
  5. TPS setting
  6. Tune up on a 89 Deville w/ 4.5
  7. Quick Question
  8. 92 eldorado E0085 dtc help pls
  9. Engine Rattle
  10. 4.1 chrome?!
  11. WHat Buttons Do I hit to CHeck the Error COdes On My 93 4.9?
  12. 4.9 off idle stumble
  13. HELP! Would a bad EGR valve cause my car to run rough on the highway?
  14. White Smoke
  15. Radiator Leak
  16. 4.5 Vs 4.9... Compairable?
  17. ROUGH idle , strange code .
  18. 85 Fleetwood FWD Engine Trouble
  19. WTB: ASAP 4.9L Front Exhaust Manifold
  20. 91 Deville 4.9 rough idle
  21. My 86 SedanDeville is running rough above 55mph
  22. Has anyone converted to the electrocruise?
  23. '86 DeVille HT4100 knock - please help :-(
  24. Engine noise while in park?
  25. 4.9 with poor gas mileage. just changed o2
  26. Low Oil Pressure
  27. Changing oil pan gasket
  28. Looking for a couple of VSS wires - '91 Deville
  29. the return of E48/E49
  30. 84' seville is a mess!
  31. EGR Vavle
  32. engine swap
  33. 92deville, idle(rough) Injector service??
  34. CAM sensor
  35. supercharging the 4.9
  36. Please help me with my 4.1..or give me a mechanic who can
  37. How to remove/replace rattling CAT
  38. pellets and 4.5 engine
  39. ohm reading for injectors on 4.5
  40. ? acceptable ohm resistance for injectors
  41. Intermittent Stalling
  42. 4.5 EGR vs. 4.9 EGR
  43. 4.5 engine
  44. Pushrod?
  45. Got new codes today.
  46. 90 Deville Dies while driving
  47. 84 4.1 Swap To 305/350 ?
  48. new to the forum, need a little help (90 4.5l pfi)
  49. Air Pump Seized (4.1 engine)
  50. OBD I codes for 4.x Engines
  51. junked 4.1 installed chevy 5.0 runs great
  52. I replaced my tps and isc but it stall every now an then
  53. Engine running rough
  54. 85 cadillac seville
  55. '93 4.9L Spark Plugs and Wires
  56. TCC location, please Help!!
  57. White smoke still coming from exhaust?
  58. Starter Disabled "Anti-Theft"
  59. need source for 99 cadillac service manuals
  60. HT4100 coolant issue.
  61. 92 (4.9L) stalling
  62. Cars starting to run a little better!
  63. Oil Overfill Cause Engine Damage?
  64. 4T60E Trans Sport Mode???
  65. can't advance computer beyond PCM?
  66. Turbocharge the 4.9L?
  67. Transmission Wont Shift
  68. discontinued?
  69. Replaced Injectors.. Still no action in Cyls 3 and 4?
  70. Edelbrock engine....
  71. Rough Idle
  72. A/c
  73. Speedometer problems......
  74. 1985 Seville HELP NEEDED
  75. Weird A/C air condition problem
  76. Size of O-rings in fuel line
  77. Fuel Filter Location.
  78. 94 Deville Boils Over after Engine Off
  79. Dexcool in a 4.9L???
  80. 1992 4.9 goes to open loop at HWY speeds.
  81. Bad Engines?
  82. fuel pump location (84 4100)
  83. car wont start (84 4100)
  84. Overhauling and Modifying a 1982 HT4100
  85. 92 deville bad head gasket selling?
  86. 92 deville please help
  87. New 4.9 problem, horrific idle, backfiring
  88. Oil Cooler...
  89. 83 eldorado with new reman engine and tranny timing / ping probs
  90. 4.1 to 4.7
  91. Car giving me fits
  92. 89 Seville idles at 2200
  93. help with codes
  94. 4.5 cranks but no start
  95. 4.9L Stalling out
  96. 'Service Engine Soon' Light on my 4.9 DeVille - Any ideas?
  97. Pistons for a 4.5L and 4.9L the same???
  98. 4.9 distributor help
  99. umm...help please!
  100. 84 coupe deville codes
  101. engine swap
  102. 1990 deville starter replacement
  103. TPS Enhancer
  104. What kind of spark plugs for the HT4100?
  105. Vehicle Data List, Can you spot the problem?
  106. changing belt
  107. 92 Deville - OIL IN COOLANT
  108. 94' sedan deville woes Heeellllllp.
  109. What are the troubleshooting steps for injectors/plugs/wires?
  110. 4.9 Engine Oil Cooler Line replacement
  111. INTERMITTANT "Missing" and rough running/idle
  112. Ppplllleeeeaaassseee Help!!!
  113. ok so maybe its the alternator
  114. engine coolant supplement
  115. Ford SVO Injectors, Can i use them?
  116. '85 Deville Engine Temp Fan Light
  117. If I disconnect the battery.....
  118. 4.9L distributor questions
  119. How to go into different parts of OBD?
  120. gas smell?
  121. 92 Deville Surging during idle!
  122. symptoms of a bad cat?
  123. ebay purchase question?
  124. Flowmaster 80 Series-I LOVE IT!
  125. Over Heating
  126. high throttle on start. Code 26
  127. Fram Air Hog-Test
  128. 4.9L Roller Rockers?
  129. '86 Fleetwood 75 FWD
  130. TPS Adjustment for 85 4.1 (RWD)
  131. where is the thing???!!!!!!????
  132. radiator removal and installation
  133. 92 deville "set timing mode"????
  134. Ahh!!!
  135. What to do to make car stop running rich?
  136. 92 deville clicking after shut off???
  137. Spark Knock, Continued....
  138. Throttle Body and Air CLeaner Housing
  139. Engine Dies...
  140. Quick PCV question
  141. reman Ht 4100 is in looking for reman tranny advice, sources, install, fluid etc.
  142. bogging 4.9 in a Fiero
  143. Hi - 89 Deville 4.5 Liter V8 in 84 Pontiac Fiero
  144. Overheat Problem
  145. '89 DeVille, ISP motor bounces
  146. How to tell if water pump is going out?
  147. Overheating Badly
  148. MAT Sensor location...
  149. Serpentine belt for 4.9 ('91 Deville)?
  150. sputtering
  151. Radiator leak
  152. 15 Amp ERLS blowing
  153. 94 deville fuel delivery prob. HELP!
  154. wtf
  155. loud tapping noise in the left bank sounds like from top end
  156. swap engine
  157. eric
  158. replacing a broke pulley
  159. Jrb
  160. 87 eldorado 4.1L in an 84 fiero - SES light ON
  161. so many codes!
  162. 91 Deville 4.9 with no power- Need Help
  163. 0.07 volts for ground???
  164. 87 Eldorado 4.1L
  165. type of oil
  166. ISC motor idle speed
  167. how do i remove the throttle body?
  168. got my 4.1 reman in but it wont fire up
  169. High RPM on Motor Start - 4.9
  170. 4.5 V8 Water in Oil
  171. 88 4.5 V8 Water In Oil
  172. Aftermarket 4100 Parts?
  173. coolant leak from timing cover?
  174. Hammer -vs- Fussy Starter
  175. bad thermostats, hopefully?
  176. 4.1 TPS sensor
  177. Strange engine/ecu problem
  178. Best motor oil for 4.9?
  179. 4.5 Coolant Problems, Leaking Fluid - but from where?
  180. simple 4.9 questions
  181. 4.9L Firing order + Cylinder location HERE!
  182. 4.1 Rough Idle
  183. Best (Worst) Air Filters to Use
  184. 4.9L performance upgrades?
  185. 4.1 to 4.5 swap
  186. How much for New Head Gaskets?
  187. new mat and coolent sensors
  188. rough idle and sputtering
  189. 4.1 exhaust manifold
  190. 4.9 Head Gasket
  191. problem with "service engine soon"
  192. Advance timing on 4.9
  193. What MPG for 87 Eldorado, 4.1?
  194. E048 EGR fault code how to fix?
  195. 4.9 And The Gas Mileage Sucks!!!
  196. Any way to disable the ses light?
  197. 95 deville tranny question
  198. 92' dies then restarts by its self
  199. ECM pinouts
  200. Dead 89 deville engine
  201. Going to be a long weekend
  202. A few questions for the Caddy Experts 4.9L
  203. old radiator cap problematic?
  204. 4.9 ltr
  205. 4.9 reliability :P
  206. Help With Code
  207. confused
  208. 4.9 Ltr Timing Belt?
  209. Drive ADL switch?
  210. spark plug question
  211. code ro15
  212. 92 Fleetwood 4.9 hesitation/code help
  213. 4.5 no start, no life. sorta familiar
  214. Yea another code ??
  215. 4.1 Operating Temperatures
  216. coolant leak
  217. A few questions regarding the 4.9
  218. code questions please...
  219. Throttle body bolt stripped out of intake manifold
  220. steering wheel will lock up and car cut off
  221. Help with 89 Sedan deVille codes...
  222. how good are the bottom ends on the 4.9?
  223. E98 code - help!!??
  224. 4.9L northstar
  225. Need help ... engine kicks, accelerates/revs itself
  226. '89 DeVille a/c not working
  227. HT4100 Stalling
  228. 4.9 oil consumption
  229. ht 4100 change over to 350 chevy
  230. Will 4.9 heads fit on a 4.1 block?
  231. Thinking about getting a new coil
  232. 87 Cadillac Seville ,4.1 with blown head gasket
  233. Hi. I need lots of help concerning the 4.9L. Thanks.
  234. timing a 4.5
  235. pulley bearing? serpentine belt not moving
  236. Hub on crankshaft
  237. Tackling Motor mount Replacement-92 Seville(4.9)
  238. 1. Diag Codes 2. Engine Stall
  239. squeek squeek .my speedo cable i think
  240. coolant in oil in my new motor
  241. coolant in oil
  242. Reconnecting Spark Plug Wires - 4.9L
  243. rough poor idle on 91 Seville STS 4.9 ideas?
  244. bbob???
  245. Better MPG with 87 Octane
  246. Preliminary tune-up
  247. car from hell
  248. 1988 Coupe Deville 4.5 ECM problem
  249. Please Help!!!
  250. Well, it cranked but...