HT4100 4.1, 4.5, 4.9 | Cadillac Owners Forum

Sticky OBD I codes for 4.x Engines

0

76K

What's so great about the 4.9 engine?

2 3

42

19K

by Diamondwhiteseville

Bypass A.I.R. pump

1

949

Boosting HT4100 Performance

2

32

24K

I want it to go faster

0

251

by DennisArendt

1984 fleetwood 4.1 Timing Belt

2

325

by jayoldschool

4.1 L, Two Coolant sensors?

2

320

1985 Eldorado thinks it a diesel?

4

954

by smokuspollutus

1990 4.5l misfire e49 and low compression reading

0

110

4.1 to 4.9 swap

2

21

4K

by smokuspollutus

91 Deville 4.9 misses when hot outside

4

850

by Hog

87 deville 4.9 v8

0

167

by Caddy daddy 78/87

Advice after engine rebuild

5

519

90 deville backfiring and running rough?

13

3K

by Deezy

89 Deville engine pinging under load when warm

9

3K

by punchyponcho

Idle is too high

0

492

1990 Deville-- Code E41

8

8K

by Dominguez123

1984 Fleetwood Brougham E28 Service Soon Code

0

337

by mr_ramirez84

1984 Eldorado Biarritz (HT4100 Top End Overhaul)

13

1K

by smokuspollutus

1992 ETC - 4.9 unstable idle

4

516

by willx2

4.1L Engine Swap

3

610

by jayoldschool

4.1 main bearing thump

5

2K

1983 Cadillac Seville HT-4100 Vacuum Leak?

16

13K

1984 Eldorado Biarritz (HT4100 engine pictures needed))

5

401

4.9 low rpm/light throttle stumbling/bucking

14

5K

by willx2

Ht 4100 caught fire help!!!

0

177

E49 code and possible solutions.

2

26

15K

92 Allante 4.5 returning E041 Cam sensor

6

2K

Vacuum Line Routing Egr Solenoid & Regulator

6

9K

Cold Air Intake?

1

943

1992 4.9l and the unavailable 10W30

4

659

by jayoldschool

4.1 V8 motor oil leak

1

513

by 1983 Fleetwood Brougham

Searching for 4.X parts...Can anyone help?

5

1K

by smokuspollutus

Coolant supplement Tabs

15

7K

by Submariner409

Engine swaps for 1984 Fleetwood

5

672

0

387

by CadillacCreel