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HT4100 4.1, 4.5, 4.9

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Sticky OBD I codes for 4.x Engines
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73K
 by DaveSmed
Boosting HT4100 Performance
2
28
22K
 by DemonCaddy
Idle is too high
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204
 by Joselopez
1990 Deville-- Code E41
8
8K
 by Dominguez123
1984 Fleetwood Brougham E28 Service Soon Code
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186
 by mr_ramirez84
1984 Eldorado Biarritz (HT4100 Top End Overhaul)
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830
 by smokuspollutus
1992 ETC - 4.9 unstable idle
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372
 by willx2
4.1L Engine Swap
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408
 by jayoldschool
4.1 main bearing thump
5
2K
 by Killa ninja
1983 Cadillac Seville HT-4100 Vacuum Leak?
16
12K
 by Naija510
1984 Eldorado Biarritz (HT4100 engine pictures needed))
5
209
 by Naija510
4.9 low rpm/light throttle stumbling/bucking
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5K
 by willx2
Ht 4100 caught fire help!!!
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99
 by Naija510
E49 code and possible solutions.
2
26
14K
 by Rivieraman
92 Allante 4.5 returning E041 Cam sensor
6
1K
 by Byrdman
Vacuum Line Routing Egr Solenoid & Regulator
6
9K
 by MooseMoose
Cold Air Intake?
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850
 by PhletchSRX4
1992 4.9l and the unavailable 10W30
4
522
 by jayoldschool
4.1 V8 motor oil leak
1
392
 by 1983 Fleetwood Brougham
Searching for 4.X parts...Can anyone help?
5
935
 by smokuspollutus
Coolant supplement Tabs
15
6K
 by Submariner409
Engine swaps for 1984 Fleetwood
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520
 by Cadikid85
Misfire 93 4.9
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309
 by CadillacCreel
Swapping HT4100 (4.1L V8) Fleetwood Brougham with a 5.7L V8
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994
 by smokuspollutus
1988 4.1L Allante Change Spark Plugs?
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517
 by Submariner409
Bypass A.I.R. pump
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535
 by Drbaker79
transmission dip stick
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454
 by cranney
Is it worth it to buy a 1984 Eldorado with the HT4100 V-8 ?
2
952
 by Submariner409
Ht 4100 parts
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437
 by 1984devillelimo
4.5 oil pan removal
4
2K
 by sallygreen
92 Deville runs rough. See pics
7
769
 by cadillac_al2
Convert 4.9L Distributor to 1 wire non-electronic
1
298
 by cadillac_al2
4100 issue, need help!
4
716
 by carnut
Dull clattering at idle
3
709
 by carnut
1992 DeVille 4.9 Oil Pan Removal
2
586
 by FiftySeriesSixtyTwo
Crank Damper Pulley
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272
 by RoadHazzard
HT4100 4.1, 4.5, 4.9 This forum is to discuss the newer aluminum block Cadillac engines.
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