Weird Distributor/Idle Problem
Thread Starter
Racer
Joined: Dec 2010
Posts: 281
Likes: 4
From: Holbrook MA
Weird Distributor/Idle Problem
Over the weekend I installed an new Accell dist in my 77 L48. I set the base idle at 16 degrees and the car ran great. Then I remembered that I hadn't reconnected the vac line to the vac advance. When I did, the car idled rougher, with a slight misfire every few seconds. It has an adjustable vac canister, so I tried everything from all the way in to seven turns out, and it still idles better with the vac advance disconnected. Any ideas?
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
The combination of your initial timing and the vacuum advance is giving you more advance at idle than the engine wants.
In order to run manifold vacuum to your vac advance, you may need to run less initial advance.
In order to run manifold vacuum to your vac advance, you may need to run less initial advance.
Instructor
Joined: Aug 2009
Posts: 112
Likes: 0
From: Caledon Ont
If you have a timming light with a built in advance dial you check timing with the vacume to your dist. Set the dial to the timing you want and rotate the dist until the mark lines up to 0 on at you crank. This is good to within 2 degrees before or after TDC.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
