two problems
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,165
Likes: 8
From: Where are the Smoky Mountain Cruisers? Not Correctly Restored Stingray
two problems
My car pops when decelerating after installing JCL's and Hookers, how can I adjust this out?
My four barrel does not seem to kick-down. What sould I check to fix it? The four barrel didn't seem to work before switching the exhaust either.
The car doesn't like gas when I first start it, it won't allow any pedal until it warms up a bit.
:cry
[Modified by 74 vert, 8:43 PM 5/31/2003]
My four barrel does not seem to kick-down. What sould I check to fix it? The four barrel didn't seem to work before switching the exhaust either.
The car doesn't like gas when I first start it, it won't allow any pedal until it warms up a bit.
:cry
[Modified by 74 vert, 8:43 PM 5/31/2003]
Melting Slicks
Joined: Dec 2000
Posts: 2,198
Likes: 2
From: Eastern Connecticut
Re: two problems (74 vert)
My car pops when decelerating after installing JCL's and Hookers, how can I adjust this out?
***That's the sound of power, leave it alone. LOL! Your mixture might be rich, try turning in the idle screws a little for an easy fix.****
My four barrel does not seem to kick-down. What sould I check to fix it? The four barrel didn't seem to work before switching the exhaust either.
***Do you mean the secondaries don't open, or the automatic tranny doesn't downshift?***
The car doesn't like gas when I first start it, it won't allow any pedal until it warms up a bit.
***Your choke isn't adjusted properly - the pulloff is probably opening too far, you have to bend one of the rods to close it slightly***
Joe
***That's the sound of power, leave it alone. LOL! Your mixture might be rich, try turning in the idle screws a little for an easy fix.****
My four barrel does not seem to kick-down. What sould I check to fix it? The four barrel didn't seem to work before switching the exhaust either.
***Do you mean the secondaries don't open, or the automatic tranny doesn't downshift?***
The car doesn't like gas when I first start it, it won't allow any pedal until it warms up a bit.
***Your choke isn't adjusted properly - the pulloff is probably opening too far, you have to bend one of the rods to close it slightly***
Joe
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,165
Likes: 8
From: Where are the Smoky Mountain Cruisers? Not Correctly Restored Stingray
Re: two problems (joe73vette)
***Do you mean the secondaries don't open, or the automatic tranny doesn't downshift?***
The secondaries don't open, I have a 4-speed.
The secondaries don't open, I have a 4-speed.
Melting Slicks
Joined: Dec 2000
Posts: 2,198
Likes: 2
From: Eastern Connecticut
Re: two problems (74 vert)
***Do you mean the secondaries don't open, or the automatic tranny doesn't downshift?***
The secondaries don't open, I have a 4-speed.
The secondaries don't open, I have a 4-speed.
There is a little tab that holds the secondaries closed when the choke is on. It should be free when the choke is open. Look on the passenger side of the secondary throttle shaft. There is a rod to adjust that. Also, see if the air flap over the secondaries opens easily by pressing on it with the motor cold and off. That should be free, but if you have a later carb, there is a tab that keeps that closed, too, that the choke operates. If it moves but with a lot of force, the spring is wound too tight, loosen it some.
All these adjustments are described in a good Motors manual or the instructions that come with a Q-jet rebuild kit. Joe
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Re: two problems (74 vert)
The poping sounds like backfire and to me that's the job of vacuum advance. This is complicated by the vacuum canister rating or adjustment after engine mods - cams, compression, etc.. Lars posted an excellent discription in the forums Tech Tips section under C3 with the forum tools.
Your Q-jet secoundary valves/butterflies are actuated by a link off the primaries but air flow is controlled by an air valve on carb top adjusted by a spring. Now I've read books on Q-jets and rebuilt a couple and can say I've given up on them. The learning curve is just too long and I don't have that kind of time. Holley, Carter, or Edlebrock will get the job done and cheaper too.
Yes the no gas until warm-up problem sounds like a choke pull-off. Another lever item controlled by a diaphram unique to the Q-jet. :seeya
Your Q-jet secoundary valves/butterflies are actuated by a link off the primaries but air flow is controlled by an air valve on carb top adjusted by a spring. Now I've read books on Q-jets and rebuilt a couple and can say I've given up on them. The learning curve is just too long and I don't have that kind of time. Holley, Carter, or Edlebrock will get the job done and cheaper too.
Yes the no gas until warm-up problem sounds like a choke pull-off. Another lever item controlled by a diaphram unique to the Q-jet. :seeya
Thread Starter
Melting Slicks
Joined: Jan 2003
Posts: 2,165
Likes: 8
From: Where are the Smoky Mountain Cruisers? Not Correctly Restored Stingray
Re: two problems (cardo0)
The poping sounds like backfire and to me that's the job of vacuum advance. :confused:
You mean vacuum advance off of the distributor? I installed a Mallory Mechanical distributor and don't have a vacuum advance distributor. Maybe that's why I have the pop :confused: I can live with that if it's the case.
I'm thinking about sending the carb to Lars to have it checked out. I don't have alot of experience with carbs.
[Modified by 74 vert, 7:10 PM 6/1/2003]
You mean vacuum advance off of the distributor? I installed a Mallory Mechanical distributor and don't have a vacuum advance distributor. Maybe that's why I have the pop :confused: I can live with that if it's the case.
I'm thinking about sending the carb to Lars to have it checked out. I don't have alot of experience with carbs.
[Modified by 74 vert, 7:10 PM 6/1/2003]
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Safety Car
Joined: Feb 1999
Posts: 3,630
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From: Fountain Hills AZ
Re: two problems (74 vert)
My car pops when decelerating after installing JCL's and Hookers, how can I adjust this out?