Pop in carbureator coming off idle - Team Camaro Tech
Engine General Engine Discussion.

 
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old Apr 2nd, 10, 10:18 AM Thread Starter
Senior Tech
Mark
 
Join Date: Sep 2006
Location: Bellmore, Long Island
Posts: 1,033
Pop in carbureator coming off idle

Does not happen all the time but often enough. Sitting at a light at idle sometimes when I go to accelerate I get a little pop in the carb. Only started happening in the last few weeks.

Carb is was restored two years ago and has always ran great.

Recently installed funtional cowl induction, (had open element prior to)could that have something to do with it? Maybe air/fuel mixture?

1969 Camaro SS
350/300 M20
12 Bolt 3:73 Posi

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Myfirst 69SS is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old Apr 2nd, 10, 11:36 AM
Gold Lifetime Member
Mickey
 
Moonpie's Avatar
 
Join Date: May 2008
Location: Mesquite Texas
Posts: 2,151
Re: Pop in carbureator coming off idle

What carb is it?
Moonpie is offline  
post #3 of 7 (permalink) Old Apr 2nd, 10, 11:39 AM Thread Starter
Senior Tech
Mark
 
Join Date: Sep 2006
Location: Bellmore, Long Island
Posts: 1,033
Re: Pop in carbureator coming off idle

Sorry Quardrajet..

1969 Camaro SS
350/300 M20
12 Bolt 3:73 Posi

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Myfirst 69SS is offline  
 
post #4 of 7 (permalink) Old Apr 2nd, 10, 09:17 PM
Senior Tech
AJ
 
Join Date: Jul 2006
Location: AUSTIN TEXAS
Posts: 3,842
Re: Pop in carbureator coming off idle

Initial timing, vacuum leak, bad tuning, accelerator pump set up wrong or crapping out.

The only Mustang I'd ever own is a Fender.

'68 333" Camaro
'14 5.0 Mustang
ace's68 is offline  
post #5 of 7 (permalink) Old Apr 3rd, 10, 08:59 AM
Gold Lifetime Member
Keith
 
Join Date: Jun 2005
Location: Harrisburg, PA
Posts: 1,408
Garage
Send a message via Yahoo to keithl1967
Re: Pop in carbureator coming off idle

could be a sticking valve, or in need of valve adjustment--is it a solid lifter cam?

Popping back throught he carb is likely not a carb issue, but it can certainly create one, which often "muddies" the water....becomes a "chicken or the egg type thing"...

Like aces said also, could be timing or a vac leak as well...

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
keithl1967 is offline  
post #6 of 7 (permalink) Old Apr 6th, 10, 08:37 AM
Gold Lifetime Member
Mickey
 
Moonpie's Avatar
 
Join Date: May 2008
Location: Mesquite Texas
Posts: 2,151
Re: Pop in carbureator coming off idle

Try tightening up all the top screws. Could be a slight vacuum leak somewhere. With the engine off activate the throttle by hand and see if you are getting a good accelerator pump squirt. Sounds like the acc. pump might not be covering the transition to main jets and getting a lean pop. Not enough ignition advance might cause it.
Moonpie is offline  
post #7 of 7 (permalink) Old Apr 6th, 10, 09:00 AM
Senior Tech
Wes
 
Join Date: Dec 2003
Location: Leander, TX
Posts: 2,762
Re: Pop in carbureator coming off idle

A vacuum leak causes lean-out which pops in the exhaust.

Popping through a carb means a spark plug(s) is firing with an intake valve(s) open.

Assuming your timing specs and timing chain are good, I'd first look for something in the ignition; bad wire, cracked cap, etc. There's about 90% chance you'll find something that's causing some crossfiring.

Secondly, I'd look for a possible broken valve spring(s).
Straight-line-69 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome