Vats bypass info
Thread Starter
3rd Gear
Joined: Nov 2025
Posts: 3
Likes: 0
Vats bypass info
Working on an 85 model and previous owner cut out the vats module and installed a new Rockies bypass kit and it was good till now. Also found where they had installed resistors by the steering column to try and trick the vats, cut these out due to no longer having a module lol.
When i started it was no crank no start with a solid security light, found wire from ignition switch to fuse panel burned out. Replaced ignition switch and wiring to the fuse box, cut out the new Rockies bs and after reading out 85 and 86 model wiring diagrams cut a white wire at the ecm and provided constant ground, pushed power to the distributor b+ pin and it started fine, idled great. Cut the car off and crank no start, verified spark, fuel pump isint cutting on. Bypass fuel pump relay and definitely have good pressure at the rails. Is there something im missing that the ecm wants to see from the nonexistent vats? No more security light, we dont have a door key or the door locks or so jank that the key wont fit anymore.
Any help is appreciated!
When i started it was no crank no start with a solid security light, found wire from ignition switch to fuse panel burned out. Replaced ignition switch and wiring to the fuse box, cut out the new Rockies bs and after reading out 85 and 86 model wiring diagrams cut a white wire at the ecm and provided constant ground, pushed power to the distributor b+ pin and it started fine, idled great. Cut the car off and crank no start, verified spark, fuel pump isint cutting on. Bypass fuel pump relay and definitely have good pressure at the rails. Is there something im missing that the ecm wants to see from the nonexistent vats? No more security light, we dont have a door key or the door locks or so jank that the key wont fit anymore.
Any help is appreciated!
Team Owner
Joined: Sep 2003
Posts: 25,373
Likes: 2,734
Melting Slicks
Joined: Aug 2011
Posts: 2,844
Likes: 176
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Drifting
Joined: Nov 2015
Posts: 1,705
Likes: 326
Finalist 2020 C4 of the Year - Unmodified
MFG Date is NOT the same as the model year. As others mentioned, VIN has the actual model year.
Guessing your '86 also has iron heads, as in the valve covers have bolts around the edge. This makes it an "early" '86, later in this run switched to aluminum heads.
Guessing your '86 also has iron heads, as in the valve covers have bolts around the edge. This makes it an "early" '86, later in this run switched to aluminum heads.
Supporting Vendor
Joined: Nov 2025
Posts: 251
Likes: 27
From: Cotopaxi, Colorado