Welcome to the New and Improved C4 DIY Sticky.
Thanks to all the great members here for sharing their experiences. This would be an empty thread without all of you.

If you've done any mod, repair etc. with pics, post just the link here.

I will copy/paste your link here in the opening post under it's appropriate designation.

BUYERS GUIDE AND PRE-PURCHASE CHECKLIST (What should I look for in a C4?)

http://www.corvettephotographs.com/c...repurchase.htm

http://tinyurl.com/68ljjt

Ok. Now that you bought one......

FIRST THING ANY C4 OWNER SHOULD DO
Emergency Hood Release
http://forums.corvetteforum.com/c4-g...with-pics.html

HOOD WON'T RELEASE
Post #4
http://forums.corvetteforum.com/c4-t...-not-open.html

TECH TIPS A to Z
https://www.corvetteforum.com/techtip....php?TopicID=2
The above link you will find:

1 to 4 Shift Lockout Relay
1984-96 Antenna Bypass Switch
2 Minute Door Handle Renew
A-arm Bushing Press-replacement poly
AC R134 retrofit
ADDITION BOSE AMP FIX INFORMATION
Additional Headlight Bushing replacement info. 1988
Additional to alternator.
Air Cleaner Housing Maintenance
Bloomington Gold
Brake noise eliminator
C-4 Door handle Renew/ Reconditioning
C-4 Tech Tip: Fuse Box Panel ****
C4 4+3 Overdrive Bypass
C4 Bose Amp Fix
C4 door panel attachment repair
C4 drive-on ramps
C4 Exhaust manifold stud removal and 3 stud bracket fix
C4 Exhaust Resonance Tips
C4 Front Spring Removal.
C4 Ramps for under $45
C4 Rear Axle Recommended Maintenance
C4 throttle body coolant by-pass
C4 Wiper Arms
Car Will Not Start When Hot!
Changing the fule filter on a late model C4
Cheap Blower and Turbo Silicon Hoses & Elbows
Cheap One Man Brake Bleeder
Complete vented Optispark replacement guide
Convert the A/C Condenser to a transmission oil cooler
Coolant flushing tool
Dana 36 =>Dana 44
Disable Light Sensor for Automatic Headlights
Do-It-Yourself Wheel Alignment
Early Convertible Top Installation and Glass Retrofit
Early LT1 P/S Upgrades For Reliability At Higher RPM
Electronic Climate Control Intermittent
Electronic Climate Control Intermittent
Emergency Hood Release
Five cheap mods to give your C4 up to 70 added HP
Fixing Your C4 Sport Seat Lumbar Support
Free Fuel Pressure Increase Modification
General Notes for Rebuilding a '92-'96 Tilt Steering Core
Getting in when you're locked out...
Hard starting fuel problem diagnosis
Headlight motor repair / Bushing replacement
Heated O2 Sensor for Long Tube Headers
How to adjust doors and side window glass
How to Adjust your Early C4 TPS and Idle Speed
How to Bleed a Master Cylinder
How to change a fuel filter in late model C4s.
How to control both fans with the Aux Fan Switch on a C4.
How to Do an Open Air Lid Mod
How to Remove and Clean your Radiator
How to remove the power antenna motor from 1992-96 Vettes
How to Repair & Rebuild your Alternator
How to Repair & Refinish Interior Plastic Pieces
How to replace CS-130 alternator with CS-144
How to Replace Your Front Brakes
How to Replace your Waterpump & Timing Chain
How to straighten a warped airbox
How to Upgrade Your Driving Lights
HVAC Diagnostic code translation 90-96
Idle Air Control (IAC) Valve for LT1/4
Inf Rest Light on 1990 Corvettes
Installing a Custom Eprom
Installing a Fire Extinguisher in your C4
Keyless Entry Remote Maintenance
Lowering your C4
LT-1 Coolant Change Procedure
LT1 Throttle Body Coolant Bypass
LT1 to LT4 Instrument cluster R&R
Lumbar Pump Repair (sport seats)
Manual control of your cooling fans
Meziere Coolant Pump Install
Mirror Rattle Fix
MSD installation in C4
No cost air Pump Removal
No More Squeaky Tops
Optispark Repair
Outer Door Window Weatherstrip Replacment
Plenum Studs
Popping / Buzzing Bose System (even when the radio is off & key is out) ... and how to fix it.
Possible cause of hard starting and no fuel pressure.
Power Steering Pump Replacement Cheat........
R-406A, a replacement for R-12
Random starting LT1
Refinishing Black Plastic Panels in a C4
Remove the late L98 "Frisbee"
Replace your outer window seals
Replacing C4 Seat Covers
Replacing the Breadbox on a C4 Corvette
Ripper Shifter Install
Rubber Bumper Repair Basics
Rubber coating on console - how to fix it.
Steering Rack Replacement
Steering Wheel Replacement on a Budget
Think you have a leaking injector, try this test.
Throttle Body Cleaning 101
Tires
Transmission problem solving
Universal Joint Removal and Installation
Upgrade your '85-'89 ECS module.
Using 94 Firebird Part For 91-96 Front Hub Bearing
Valve Cover Removal on 1985 Corvette
VAT key codes and values
Worn Wire Loom Behind Battery Tray
ZF Transmission Recommended
'94-'96 Power Antenna Motor Replacement
'96 Auto Transmission Removal


MEMBER HOW-TO PICTORIALS

LT1/LT4 SPECIFIC REPAIRS/REPLACEMENTS

LT1 Optispark/Waterpump Install
http://forums.corvetteforum.com/c4-t...-pictures.html

LT1 Fuel Injectors (Bosch III Install)
http://forums.corvetteforum.com/c4-t...up-within.html

LT1 Brake Booster Replacement
http://forums.corvetteforum.com/c4-g...with-pics.html

LT1 Fuel Pump
http://www.joby.se/corvette/mods/2001-0X07_fuelpump/
Newest edition 10-1-10
http://forums.corvetteforum.com/c4-t...s-of-pics.html

L98 REPAIRS/REPLACEMENT

How to Adjust TPS and Idle
http://forums.corvetteforum.com/c4-t...dle-speed.html

L98 valve seals
http://forums.corvetteforum.com/c4-t...8-finally.html

4+3 O/d filter
http://forums.corvetteforum.com/1571645223-post6.html

TPI Sensor Locations and resistance values
http://www.corvettebuyers.com/c4vett...nformation.htm

Brake Booster Replacement
http://forums.corvetteforum.com/c4-g...tructions.html

90/91 Tacho Problems (Read Both!)
http://forums.corvetteforum.com/c4-g...1990-vert.html
http://forums.corvetteforum.com/1574563401-post2.html

1990/91 High Read Tach Repair
http://forums.corvetteforum.com/c4-g...post1575222722

Park brake adjust 84 - 87
http://forums.corvetteforum.com/1560187929-post1.html

4+3 Trans Operating differences by year
http://www.5speeds.com/43table.htm

GENERAL REPAIR/REPLACEMENT (L98/LT1/LT4)

Service Bulletins
http://www.corvetteactioncenter.com/...s/1984+-+1996/

Fuel Gauge Stuck (and how to repair)
http://forums.corvetteforum.com/c4-t...h-article.html

Headlight Motor Bushing Replacement
http://www.corvettefever.com/howto/33098/index.html

BlackHarleyMans' Suspension Rebuild (LT4)
http://forums.corvetteforum.com/c4-t...-pictures.html

Park brake adjust 88+
http://forums.corvetteforum.com/1574610903-post5.html

Replace tail lights/bulbs
http://forums.corvetteforum.com/1568414438-post5.html

Headlight bushing replace ( late 2 wire )
http://home.comcast.net/~zrjuan/headlight.html

C4 Engine wiring Diagrams (inc fans / lights /charging )
http://www.franken-us-buddys.de/inde...-%20Wiring.pdf

Fuel gauge sender repair
http://forums.corvetteforum.com/c4-t...h-article.html

ZF6 Clutch and Slave Cylinder Replacement
http://forums.corvetteforum.com/c4-g...-included.html

Weatherstrip
http://forums.corvetteforum.com/c4-g...therstrip.html

Head Gasket (Post #19)
http://forums.corvetteforum.com/c4-t...-1991-l98.html

Rear Clicking Sound
http://forums.corvetteforum.com/c4-t...e-washers.html

ECM-PCM Tuning FAQS
http://forums.corvetteforum.com/c4-s...ction-faq.html

VATS Bypass/Removal/Troubleshoot
http://www.vatssucks.com/

INTERIOR

Sport Seat Leather Replacement (Done on a 1988)
http://forums.corvetteforum.com/c4-t...ats-today.html

Seat Leather Replacement (Done on a 1990)
http://forums.corvetteforum.com/c4-g...-write-up.html

Visor Replacment
http://forums.corvetteforum.com/c4-t...tallation.html

Door Panel Fix
http://forums.corvetteforum.com/c4-g...panel-fix.html

Repairing/Replace Headliner
http://forums.corvetteforum.com/c4-g...post1567849184

84 -86E Window Regulator upgrade (or fix 86L+)
http://webpages.charter.net/khasting...windowreg.html

Repairing Plastic Trim
http://forums.corvetteforum.com/c4-t...stic-trim.html

CAR AUDIO UPGRADE/SWAPS

Complete Audio Upgrade
http://forums.corvetteforum.com/audi...kers-subs.html

Custom Speaker Boxes/Audio Upgrade
Part 1
http://forums.corvetteforum.com/c4-g...-no-56k-2.html
Part 2
http://forums.corvetteforum.com/c4-g...ii-no-56k.html

ENGINE BUILDS/SWAPS

PLRX LT4 Build Up
http://forums.corvetteforum.com/c4-t...-plrx-lt4.html

BLACKHARLEYMAN'S LT4 383 Build
http://forums.corvetteforum.com/c4-t...-pictures.html

COPO'S LS3 Monster Swap
http://forums.corvetteforum.com/c4-f...-out-here.html

LT1 to LS2 Swap
http://forums.corvetteforum.com/c4-t...ction-pix.html

MODS/UPGRADES

LT1/4- What NOT to waste your $ on
http://web.archive.org/web/200801201.../increase.html

LT1 More HP
http://web.archive.org/web/200801201...rformance.html

AC Delete without idler (L98)
http://forums.corvetteforum.com/c4-t...te-pulley.html

Upgrading Auto Trans- Install a 4L80E
http://www.joby.se/corvette/mods/2004-12-26_4l80/

Mod to use D36 C Beam with D44 swap
http://www.joby.se/corvette/mods/2001-0X11_diff/

C5 Brake Upgrade
http://forums.corvetteforum.com/c4-t...done-pics.html

Brake Bias Spring after C5 Install (Post #7)
http://forums.corvetteforum.com/c4-t...pgrade-do.html

Installing Coilovers LT1/LT4
http://forums.corvetteforum.com/c4-t...r-summary.html

Installing Coilovers L98
http://forums.corvetteforum.com/c4-t...lover-mod.html
http://forums.corvetteforum.com/c4-t...ck-towers.html

L98 HSR Mod
http://forums.corvetteforum.com/c4-t...r-hsr-mod.html
http://forums.corvetteforum.com/c4-t...ealth-ram.html

L98 Exhaust Comparison
http://forums.corvetteforum.com/c4-t...te-videos.html

DeWitt Aluminum Radiator Install
http://forums.corvetteforum.com/c4-t...tallation.html

LT1 Header Install
http://forums.corvetteforum.com/c4-g...es-within.html

HID Install
Headlights
http://forums.corvetteforum.com/c4-t...with-pics.html
Fog Lights & Markers
http://forums.corvetteforum.com/c4-t...installed.html
Tail Lights
http://forums.corvetteforum.com/c4-g...ion-picts.html

B&M Shifter
http://forums.corvetteforum.com/c4-t...installed.html

Front Air Dam Mod
http://forums.corvetteforum.com/c4-g...t-air-dam.html

Major Repaint Prep
http://forums.corvetteforum.com/c4-g...s-of-pics.html

L98 Trans Swap- 4+3 to T56
http://members.cisdi.com/~anesthes/f-car-t5/

Lowering your C4 (Front and Rear)
http://webpages.charter.net/khasting.../lowering.html

Speedo gear Calculator for rearend ratio change
http://webpages.charter.net/khasting...peedocalc.html

Interesting Fog and Side Vent Screen Cover Mod. How to starts on Post 16.
http://forums.corvetteforum.com/c4-g...you-think.html

1984 SPECIFIC

Wiring Diagram
http://forums.corvetteforum.com/c4-g...es-within.html

Parking Brake Adjust 84-87
http://forums.corvetteforum.com/1560187929-post1.html

4+3 Trans Operating differences by year
http://www.5speeds.com/43table.htm

4+3 O/d filter
http://forums.corvetteforum.com/1571645223-post6.html

Oil Pan Gasket Replacement
http://forums.corvetteforum.com/c4-g...t-placing.html

OTHER ITEMS LISTED IN THIS THREAD

How to Pull Codes on your C4
Post #18 Below