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Engine Performance + Maintenance
If it's under the hood, its in here.
96+ Vortec Performance + Computer Swaps
If you want to do the 0411 PCM swap or have a 1996+ Vortec motor this is your forum!
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19K
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19K
99 L29 454 build
37 minutes ago
BNielsen
LSX + Carb Swaps
This section is for info on LSX or carburetor swaps into the OBS trucks.
Threads
634
Messages
7.9K
Threads
634
Messages
7.9K
5.7 TBI to 5.3 LM7
Yesterday at 6:36 PM
Schurkey
Exhaust
Anything exhaust - from headers cats and pipes to tips.
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1.1K
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13.9K
Threads
1.1K
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13.9K
New Y-pipe and cat for the old girl
Today at 5:53 PM
L31MaxExpress
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Sticky
Let's get connected!!!
Scooterwrench
Oct 1, 2023
4
5
6
Replies
59
Views
6K
Apr 1, 2024
Scooterwrench
Sticky
GMT400 - Community Scan Tool
studigggs
Jan 9, 2023
30
31
32
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314
Views
33K
Today at 11:07 AM
Bob2650
B
Sticky
TBI small block intake gasket replacement (PIC HEAVY)
someotherguy
Dec 25, 2022
3
4
5
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41
Views
13K
Feb 16, 2024
95OBSMan
Sticky
How to Put a Vortec Motor in a TBI Truck
Erik the Awful
Jun 17, 2020
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113
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74K
Mar 26, 2024
rebelyell
R
Sticky
88-98 Service Manuals
hatzie
Dec 15, 2018
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15
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144
Views
243K
Apr 20, 2024
BeautyandtheBeast
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Sticky
The Ultimate 88-98 Performance Toolbox
Devs93
Aug 1, 2012
2
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4
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35
Views
250K
Mar 12, 2023
jpcedotal
S
Sticky
ULTIMATE TBI mods stage 1
shelbyt.67
Jun 28, 2012
26
27
28
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273
Views
328K
May 5, 2022
PlayingWithTBI
Sticky
How to MarkVIII your OBS on a budget..!
monstar_est87
Apr 30, 2012
16
17
18
Replies
171
Views
145K
Sep 23, 2023
Casey916
Sticky
Engine Oil Cooler Upgrade: Add 2 quarts! (SAS guys you'll want to see this)
88GMCtruck
Apr 14, 2010
2
3
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28
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73K
Dec 27, 2023
pgutier1
Sticky
GMT400 History
Greg
Mar 16, 2010
23
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245
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327K
Feb 27, 2023
Will Fuller
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S
Sticky
Tune Up Parts Numbers
supjim12
Dec 22, 2009
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37
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65K
May 15, 2022
Erik the Awful
Sticky
How to Replace oil filter adapter gasket & o-ring
Hodges87
Dec 14, 2009
4
5
6
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55
Views
159K
Jun 20, 2023
Illbedipped
Sticky
Maintenance: RPO Code Database & Decoder
Greg
Dec 4, 2009
2
3
4
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33
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49K
Jul 3, 2023
GoToGuy
Sticky
Water Pump Relacement
Ginger
Dec 4, 2009
7
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86
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85K
Jun 7, 2021
HotWheelsBurban
Sticky
Intake Gasket Replacement
Ginger
Dec 4, 2009
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124
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120K
Dec 9, 2022
mary7654
M
Sticky
Putting A Chip In A TBI Truck
Bighead38
Dec 3, 2009
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202
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295K
Jul 10, 2023
mwilliams55555
Sticky
The Stupid Engine Questions Thread
Mike
Dec 3, 2009
207
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2K
Views
369K
Sunday at 4:14 PM
FighterOfTheFoo
Knock Sensore code P0325 in K2500 7.4
WojTec
Today at 5:29 PM
Replies
2
Views
46
Today at 5:36 PM
WojTec
K
Engine Cutting out and Lighting Flicker
Keymo
Today at 4:48 PM
Replies
2
Views
63
43 minutes ago
thinger2
J
New engine options 1993 K1500 5.7l tbi 4l60e
Jskingry
Today at 10:20 AM
Replies
6
Views
121
18 minutes ago
Jskingry
J
S
Thermostatic valves for the TBI Intake
Striker1423
Today at 9:43 AM
2
3
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21
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282
24 minutes ago
99xcss4
H
TBI flooding when on a full tank
highrpmsbc
Yesterday at 11:00 PM
Replies
3
Views
119
Today at 6:03 PM
GoToGuy
Knock sensor issues
Parking lot mechanic
Yesterday at 9:03 PM
Replies
4
Views
123
Yesterday at 11:07 PM
Parking lot mechanic
H
Diagnosing lean fuel air mixture/mysterious PCV line, '97 5.7 Suburban
hickoryballz
Yesterday at 3:11 PM
Replies
6
Views
139
Today at 1:52 PM
hickoryballz
H
I
Where to buy 94 5.7 TBI Intake Manifold studs or studded bolts?
indexcow
Yesterday at 12:12 PM
Replies
5
Views
122
Today at 12:04 AM
someotherguy
J
Aluminum Heads to 90 C1500
JGM350
Yesterday at 12:23 AM
2
Replies
10
Views
246
Yesterday at 6:13 PM
PlayingWithTBI
K
Oil Priming on L31 Vortec
katwood16
Monday at 10:37 PM
2
Replies
18
Views
391
Today at 9:57 AM
0xDEADBEEF
Fuel pressure issues
thatguyHoBo
Monday at 8:35 PM
Replies
8
Views
237
Yesterday at 6:45 PM
thatguyHoBo
AC Issues. Actuator?
twebuh
Monday at 7:44 PM
Replies
6
Views
187
Yesterday at 10:13 AM
twebuh
R
C2500 cranks but no start, while flashing security light 3 times
Ryanl99c2500
Monday at 5:42 PM
Replies
4
Views
121
Monday at 9:47 PM
HotWheelsBurban
Gas Mileage
Nick88
Monday at 12:40 PM
Replies
0
Views
131
Monday at 12:40 PM
Nick88
V
Hello my cheyenne 97 idle rough and accelerate poorly. At idle it sound like it as a cam in it.
vanec
Monday at 11:33 AM
Replies
0
Views
50
Monday at 11:33 AM
vanec
V
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