HT4100 4.1, 4.5, 4.9 | Cadillac Owners Forum

Sticky OBD I codes for 4.x Engines

0

89K

PCM and alternator getting hot

2

71

Allante running lean HT4100 engine 87 52000 mileage

0

72

HT4100 High Idle at startup

1

109

by smokuspollutus

Crank hub pulling

2

617

by smokuspollutus

1985 4.1 AC sounds

4

271

1984 Seville engine rebuild problems

4

431

4100 still running better to rebuild or replace

5

6K

3

953

by TreyMcFarland

Replaced EGR, engine barely runs now - 1990 4.5 Fleetwood

4

368

Blower motor resistor

1

252

4.9 PCV grommet

1

317

1990 TPS relearn procedure . . .

3

11K

Fuel Pump circuit problem 84 Brougham

6

5K

by SlideTheAddyImInMyCaddy

HT 4100 engine - is it that bad

2 3

53

47K

high RPM, ISC not the problem?

4

1K

need vacuum fitting

3

520

by donny brasco

1984 Seville 4.1 - need head bolt set

3

2K

4.9 Cracked Block Leaking Coolant

2

33

8K

oil drain holes in heads

3

476

by Marx3

1983 HT4100 coolant question

5

915

by Marx3

ht4100 aluminum valve covers

1

552

by jayoldschool

1984 4.1 wont start, need pointers!

16

986

by Marx3

4100 HT Idle speed setting

7

8K

by Christine1984

overheating, now power, 83 coupe deville ht4100

15

5K

by Christian caddy

HT4100 Damper Bolt

14

9K

by Submariner409

Life expectancy for 4.9 and 4T60E

2 3

59

21K

Why does '90 4.5L not drop to idle till almost stopped?

16

4K

by KenAllante91

thinking about getting mods on 4.5

9

8K

by Submariner409

1987 Deville 4.1 to 4.9 Conversion

2

38

23K

1982 Coupe Deville alternator not charging.

5

608

1983 Eldorado 4100 fuel pump changed - no power while in gear two days later

3

757

84 Fleetwood Brougham 4.1l rwd coolant leak near passenger side tire

0

473

by SlideTheAddyImInMyCaddy

305/350 swapping

8

968

by TONY_C

Carnut, got it to work, Thanks !

3

1K

I have a code 26 on an 84 SDV

5

2K

by Submariner409