CRG Discussion Forum

Camaro Research Group Discussion => Maintenance => Topic started by: My68SS on January 19, 2008, 02:25:18 AM

Title: Choke pull off bleed down time
Post by: My68SS on January 19, 2008, 02:25:18 AM

Hi all, the genuine choke pull off for a 4MV quadrajet [the plastic body type of pull off] has a small brass plug with a fine hole in it in the air pipe connection, to control the bleed down time and hence the opening rate of the secondary air valves.
The bleed time when operated by hand is about 3 secs from fully depressed to fully extended.
The fuelmiser part does not have any bleed down restrictor and the arm pops out in about 1/2 a sec, causing severe engine bog.
Would be interested to hear other ppls thoughts on this issue.

Title: Re: Choke pull off bleed down time
Post by: JohnZ on January 19, 2008, 06:02:11 PM

What does the choke pull-off have to do with the opening rate of the secondaries? They're completely separate - the choke pull-off just opens the choke blade slightly as soon as the cold engine starts.

Title: Re: Choke pull off bleed down time
Post by: My68SS on January 20, 2008, 02:38:21 AM

Hi John, I should have mentioned that I'm refering to the post '66 units [or thereabouts] were the vacuum break was given the job of also controlling the secondary air valves.
What you say is quite correct for earlier units which used the 'dashpot piston' design to control the air valves.