Old 11-20-2020, 08:27 PM
hill67bird hill67bird is offline
Join Date: Jan 2016
Location: xenia ohio
Posts: 52
Default 66 rear carb trouble

Hi guys hope everyone is doing well. I have a 66 setup on my car I rebuilt the carburetors myself the front 2 carbs are working fine. The rear carb is pulling fuel at an idle. I put my hand over the top of the carb it will suck my hand right against it. I am under the impression that the two end carburetors don't pull any fuel/air at an idle. I check the barrels are completely shut & checked the float height and cant seem to figure it out. Any help will be appreciated.

Old 11-21-2020, 07:10 AM
Kenth's Avatar
Kenth Kenth is offline
Ultimate Warrior
Join Date: Feb 2003
Location: The Kingdom of Sweden
Posts: 4,529

Too long adjusted front to rear carb rod holding the throttle blades open some on rear carb?

1966 GTO TriPower
1970 GTO TheJudge
Old 11-21-2020, 03:35 PM
Dick Boneske's Avatar
Dick Boneske Dick Boneske is offline
Ultimate Warrior
Join Date: Mar 2004
Location: Winneconne, Wisconsin
Posts: 5,089

Most likely what Kenth said. It could be that the throttle plates were not positioned properly to seal the bore when they were originally installed.

Easy to check the rod length and bend in the center of the rod if it's too long or unbend it until the rod fits into the center of the oval hole in the front carb lever.

If the rod is not the problem. you'll have to remove the rear carb, remove the base, and examine to see if the plates are sealing. Hold the base up to a light source and see if there are gaps. To correct, loosen the screws that hold the throttle plates in place and position the plates for optimum seal. If this can't be accomplished, you may have to resort to using DAG213 like the factory used on the end carb throttle plates to achieve a near-perfect seal. PM me if you need some DAG213.


'64 GTO Tripower Hardtop (Wife's Car)
'64 GTO Tripower Post Coupe (My Car)
'08 Grand Prix GXP LS4 V8 (Wife's Car)
'09 Pontiac G8 GT 6.0 V8

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -4. The time now is 05:37 AM.


About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.


Cold Case Radiators

Cold Case Radiators is a Max Performance company that produces high end aluminum performance radiators at a price point that won't break the bank. Polished and stamped tanks. 2 rows of 1" tubes. Lifetime Warranty.


GTOG8TA.com is a Max Performance company that manufacturers parts for the 04-06 GTO, 08-09 G8, and 93-02 Firebird/Trans Am platforms.

Copyright © 2017