C3 Vette Registry - The Best Resource on the Net for C3 Vettes! C3 Vette
Forums -> C3 Fuel, Emission Control, and Exhaust Systems
Not Logged In! Login or Register!  Users Online: 14 / Help 
Features  Find C3 Parts on ebay in only 2 or 3 clicks!  | Add YOUR C3 to the Registry

Supporting Vendors
Volunteer Vette Products
VetteBookStore.com
CorvetteClothing.com
Mid America Motorworks
Bair's Corvettes

C3 of the Month
None Current
Enter Yours Today!
Online C3 Show
13
C3s are Registered

Vanity Plates
2 FUELSH
2 cruzn
Featured Links

Buy Now
Corvette from the Inside
Corvette from the Inside


Corvette Magazine - $19.99 for 8 issues
Corvette Magazine
Only $19.99 for 8 issues


Corvette by the Numbers
Corvette by the Numbers


The Corvette Factories: Building America's Sports Car (Hardcover)
The Corvette Factories: Building America's Sports Car (Hardcover)



| Hide Signatures and Profile Pics

 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
7/1/16 8:30am - Original Message: 'Accelerator like a switch'
Grahamred70
Former Member
- Send Private Message


, - United Kingdom

Vette(s):
1970 convertible in red 350

Joined: 10/6/2015
Posts: 82
I'm having a bit of an issue tuning my Holley to get a good idle with smooth transition from off the gas to on, the pedal is more like a switch either on or off! which doesn't make it much fun around town, trying to trickle along it feels rich but on the gas it pulls like a train. Could it be the float level?
Having to take off the air cleaner to access the idle mixture screws possibly doesn't help or wouldn't it make much difference at idle?
I've got a rebuild kit for the carb but work keeps getting in the way to tinker and weekends I just want to get in and drive it!
 
Thanks
Graham
 Reply Reply  Quote Reply w/Quote
 
Support C3VR!
Suport our advertisers
7/1/16 11:13am - Reply: 'Re: Accelerator like a switch'
Adams' Apple Lifetime Member
Lifetime Member
Moderator
- Send Private Message


Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas

Joined: 11/8/2003
Posts: 19458
 Does it have a "bog", or hesitation when you first give it gas to accelerate? If so, I would first look at the accelerator pump and cam for proper operation/calibration. Check your ignition timing also.
From there I would have to say the thing needs to be cleaned/rebuilt.


____________________________________
Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
 Reply Reply  Quote Reply w/Quote
7/1/16 3:32pm - Reply: 'Re: Accelerator like a switch'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 398
If removing the air cleaner changes the idle speed, then the carb has a problem.
The good news about Holley carbs are they have a lot of adjustments.  The bad news is they have a lot of adjustments.  Wink

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
7/2/16 4:11am - Reply: 'Re: Accelerator like a switch'
Grahamred70
Former Member
- Send Private Message


, - United Kingdom

Vette(s):
1970 convertible in red 350

Joined: 10/6/2015
Posts: 82
Not so much a bog but if I press gently on the pedal nothing happens at first then the power comes on in a rush making it very difficult to drive slowly like when in traffic around town.
I'm doing a parade today in a local carnival so that should be fun (not!) but I promised so I can't let them down!
Thanks
Graham
PS Its a List 6619-1 Holley which I believe is an emmissions carb from the 70's whatever that means!


|UPDATED|7/2/2016 2:11:06 AM (AZT)|/UPDATED|
 Reply Reply  Quote Reply w/Quote
7/3/16 12:10am - Reply: 'Re: Accelerator like a switch'
73shark
Standard Member
- Send Private Message


Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 398
Is it a spreadbore or a squarebore?

____________________________________

1973 L-82 4 spd

 Reply Reply  Quote Reply w/Quote
7/3/16 1:46am - Reply: 'Re: Accelerator like a switch'
Grahamred70
Former Member
- Send Private Message


, - United Kingdom

Vette(s):
1970 convertible in red 350

Joined: 10/6/2015
Posts: 82
Not really sure of the difference, it's on a performer inlet, any way my last tweaking a seem to have been more successful as she behaved very well yesterday in the carnival procession covering a few miles at a snails pace with a celebrity guest in the car with me, pulled steadily at 500-750 rpm even up hill and idled happily when stopped. I had an issue recently when checking timing with my dial back timing light which showed the timing badly retarded but after stripping off the pulleys to check the damper all seemed to be in order so my timing light must have been playing tricks on me! I will rebuild the carb as its weeping a bit of fuel from a couple of places, nothing too serious but needs doing. Thanks for your help Graham
 Reply Reply  Quote Reply w/Quote
7/11/16 7:19am - Reply: 'Re: Accelerator like a switch'
Grahamred70
Former Member
- Send Private Message


, - United Kingdom

Vette(s):
1970 convertible in red 350

Joined: 10/6/2015
Posts: 82
Spent yesterday rebuilding my Holley, the diaphragm was porous on the accelerator pump which explained the weeping leak, everything else looked OK, quite clean inside which I was a little surprised about so the filter must be doing its job!
Just got to fit it back in place, set the float levels and see how it performs, the jets etc. were all standard to original for that carb, the only thing I did find was that the secondary float level was set low so hope the float is OK.
Thanks
Graham
 Reply Reply  Quote Reply w/Quote
 New Topic New Topic Post Reply Reply New Poll New Poll Search     Search Page [1]  
 Forums -> C3 Fuel, Emission Control, and Exhaust Systems
(Moderator: Adam Wartell, Norsky, Adams' Apple, kstyer)
 

 
Official C3 Vette Registry Community:
Home | Forums | Email | Who's Online | Clubs | Events | Member Stats

Other Official C3 Vette Registry Areas:
Members | Research | Shop | My Account | About C3VR
 

Corvette is a registered trademark of the General Motors Corporation(GM) & Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise noted) and does not claim or imply that Chevrolet or GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated with, sponsored or supported by GM.  Copyright/trademark/sales mark infringements are not intended, or implied and are in fact used to support GM, Chevrolet and Corvette

Official C3 Vette Registry content is Copyright 2001-2017, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS

Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 30