occasional misfire
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 977
Likes: 1
From: wash. dc
occasional misfire
i put in new points, rotor, cap and plugs... set dwell at 30* and timing at 16*BTDC... can't seem to get rid of occasional misfire at idle... 71BB, q-jet...also got 18-20" of vacuum at idle
Melting Slicks
Joined: May 2002
Posts: 2,431
Likes: 52
From: Florida
Originally Posted by 71redskin
i put in new points, rotor, cap and plugs... set dwell at 30* and timing at 16*BTDC... can't seem to get rid of occasional misfire at idle... 71BB, q-jet...also got 18-20" of vacuum at idle
Jim
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 977
Likes: 1
From: wash. dc
being too lean could be an issue... got it at one to one and a half out on the adjustment screws, but it also puts vac at 18-20" which i thought was the best since when tuning the carb you wanna have it set at the most vac you can get...i'll try opening it another half turn and see what that does....i'll keep you posted. thanx, ron
Melting Slicks
Joined: May 2002
Posts: 2,431
Likes: 52
From: Florida
Originally Posted by 71redskin
being too lean could be an issue... got it at one to one and a half out on the adjustment screws, but it also puts vac at 18-20" which i thought was the best since when tuning the carb you wanna have it set at the most vac you can get...i'll try opening it another half turn and see what that does....i'll keep you posted. thanx, ron
Jim
Thread Starter
Burning Brakes
Joined: Feb 2005
Posts: 977
Likes: 1
From: wash. dc
thanks jim for the input. i got a lil blue smoke and did a comp test... 140-150, sqirted oil in cylinder and press. was also good. got valve seals now just waiting for decent weather as i have a carport. i always use AC r44ts... when the rain stops i'll go over it again and see how it idles.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
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
Le Mans Master
Joined: Jul 2005
Posts: 5,752
Likes: 4
From: Austin Texas
Make sure your not tapping PCV vacuum from the #8 port fitting, it needs to be at the bottom of the carb. baseplate or on the open part of the intake plenum. If you have any vacuum hose on the #8 intake port fitting, cap it off and see if the miss is gone. Any vacuum leak at that point will cause a mis-fire on # 8 cylinder. G/L