Truck won't idle after carb rebuild - Page 2 - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #16 (permalink)  
Old 06-20-2012, 01:41 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 28
Posts: 8,661
Wiki Edits: 0

Thanks: 16
Thanked 277 Times in 259 Posts
If your leak is there those plugs should read leaner than the rest, or be wet if its so lean its not even firing at times. If it is a vacuum leak, and you do fix it, return the carb to stock settings and adjust from there.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 06-20-2012, 02:34 PM
hauss667's Avatar
Knuckle color never lies
 

Last journal entry: gettin with the times
Last photo:
Join Date: Jan 2012
Location: hillsboro, or
Age: 23
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by ap72
If your leak is there those plugs should read leaner than the rest, or be wet if its so lean its not even firing at times. If it is a vacuum leak, and you do fix it, return the carb to stock settings and adjust from there.
I'm going to pick up the intake gaskets at work today and swap em tomorrow, I'll post results. I'm not trying to disregard your cleaning idea ap I just have a gut feeling its not in the carb. If this doesnt work then I will take the carb back apart as you suggested thank you for your replies and as always cobalt its been a pleasure lol
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 06-20-2012, 02:39 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 28
Posts: 8,661
Wiki Edits: 0

Thanks: 16
Thanked 277 Times in 259 Posts
It very well could be a vacuum leak, be sure to use a good sealant on the gaskets when you do them. Hopefully one way or another you get this fixed.
Reply With Quote Quick reply to this message
  #19 (permalink)  
Old 06-20-2012, 02:47 PM
hauss667's Avatar
Knuckle color never lies
 

Last journal entry: gettin with the times
Last photo:
Join Date: Jan 2012
Location: hillsboro, or
Age: 23
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by ap72
It very well could be a vacuum leak, be sure to use a good sealant on the gaskets when you do them. Hopefully one way or another you get this fixed.
I was always taught not to use a sealant on the intake gaskets, the rubber ones yes, but not the ones where it mates to the heads, should I use some there also? And if so what would you recommend?
Reply With Quote Quick reply to this message
  #20 (permalink)  
Old 06-20-2012, 09:39 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 28
Posts: 8,661
Wiki Edits: 0

Thanks: 16
Thanked 277 Times in 259 Posts
Quote:
Originally Posted by hauss667
I was always taught not to use a sealant on the intake gaskets, the rubber ones yes, but not the ones where it mates to the heads, should I use some there also? And if so what would you recommend?
I just use black rtv, I believe cobalt uses 3m window sealant or something like that. I've never had a problem with a good even smear of black rtv. Be sure both mating surfaces are clean and dry though.
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 06-20-2012, 10:15 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by hauss667
I was always taught not to use a sealant on the intake gaskets, the rubber ones yes, but not the ones where it mates to the heads, should I use some there also? And if so what would you recommend?
Here's some recent info on installing gaskets. You can search for more.
Reply With Quote Quick reply to this message
  #22 (permalink)  
Old 06-20-2012, 11:17 PM
hauss667's Avatar
Knuckle color never lies
 

Last journal entry: gettin with the times
Last photo:
Join Date: Jan 2012
Location: hillsboro, or
Age: 23
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for the info guys, that goes against everything I've been taught, its like theres a whole new world out there lol. I've always used something called "the right stuff" by permatex, I think I'll give that a try
Reply With Quote Quick reply to this message
  #23 (permalink)  
Old 06-21-2012, 09:17 PM
hauss667's Avatar
Knuckle color never lies
 

Last journal entry: gettin with the times
Last photo:
Join Date: Jan 2012
Location: hillsboro, or
Age: 23
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
So it may just be that I'm exhausted but i'd like some input on the situation. So I replaced the manifold gaskets and put a new intake on it, I had an edlebrock air gap laying around, and got everything back together and tight and leak free. I got the engine to run decent and just on the factory settings for the carb, no more four turns out lol. It was running okay but not smooth, I had around 12-14 vacuum at idle and 18 when I hit the throttle, it would even idle In gear just fine. But the thing that bothers me is it wouldn't smooth out, almost like I had a lumpy cam. Now I can't do anymore until tomorrow because as I was putting the air cleaner on for a test drive and it died, then I found out my fuel pump wouldn't even pump fuel up to the carb. So do you think the rough issue was the fuel pump going out or does it sound like I still have a gremlin in there somewhere?
Reply With Quote Quick reply to this message
  #24 (permalink)  
Old 06-21-2012, 10:44 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by hauss667
So it may just be that I'm exhausted but i'd like some input on the situation. So I replaced the manifold gaskets and put a new intake on it, I had an edlebrock air gap laying around, and got everything back together and tight and leak free. I got the engine to run decent and just on the factory settings for the carb, no more four turns out lol. It was running okay but not smooth, I had around 12-14 vacuum at idle and 18 when I hit the throttle, it would even idle In gear just fine. But the thing that bothers me is it wouldn't smooth out, almost like I had a lumpy cam. Now I can't do anymore until tomorrow because as I was putting the air cleaner on for a test drive and it died, then I found out my fuel pump wouldn't even pump fuel up to the carb. So do you think the rough issue was the fuel pump going out or does it sound like I still have a gremlin in there somewhere?
The fp may have something to do w/it- you'll know soon enough if that's all of it. If not:

Have you rechecked the firing order, especially 5/7 (this is easy to do, don't assume it's right before you physically run the wires)?

Does the vacuum gauge needle jump rhythmically, like a miss or valve adjusted too tight?

Have you checked the initial timing? Adjusted the idle mix screws w/the vac gauge?
Reply With Quote Quick reply to this message
  #25 (permalink)  
Old 06-21-2012, 11:19 PM
hauss667's Avatar
Knuckle color never lies
 

Last journal entry: gettin with the times
Last photo:
Join Date: Jan 2012
Location: hillsboro, or
Age: 23
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by cobalt327
The fp may have something to do w/it- you'll know soon enough if that's all of it. If not:

Have you rechecked the firing order, especially 5/7 (this is easy to do, don't assume it's right before you physically run the wires)?

Does the vacuum gauge needle jump rhythmically, like a miss or valve adjusted too tight?

Have you checked the initial timing? Adjusted the idle mix screws w/the vac gauge?
Yes I had to remove the distributor to swap the intakes so I triple checked the firing order before I tried to star it

No it didn't seem have any real rhythm to it it just dropped down when idle dropped

The initial timing no, I still don't have a timing light, I'm so use to doing it by ear but I get paid in the morning and, funds allowing, I'll pick one up
Reply With Quote Quick reply to this message
  #26 (permalink)  
Old 06-21-2012, 11:39 PM
Registered User
 

Last journal entry: Thunderbird IRS in 48 Ford car
Last photo:
Join Date: Apr 2011
Location: Mineola, TX
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
carb epic fail

get some else to do your carb work.
Reply With Quote Quick reply to this message
  #27 (permalink)  
Old 06-22-2012, 12:06 AM
hauss667's Avatar
Knuckle color never lies
 

Last journal entry: gettin with the times
Last photo:
Join Date: Jan 2012
Location: hillsboro, or
Age: 23
Posts: 129
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by rcaston19
get some else to do your carb work.
Why? Theres nothing wrong with the carb?
Reply With Quote Quick reply to this message
  #28 (permalink)  
Old 06-22-2012, 06:05 AM
cool rockin daddy's Avatar
1.21 giga-watts???!!!!
 
Join Date: Aug 2003
Location: wherever cool cars are
Posts: 1,535
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Pay no attention to the NOOB who said get somebody else to do your carb work. I'd extend a welcome to the board to him but I have a feeling a ******** like him won't be around too long for it to matter.

Follow Cobalt's advice and you'll be fine. You ain't the first and won't be the last to have a vacuum leak after changing a top end part.
Reply With Quote Quick reply to this message
  #29 (permalink)  
Old 06-22-2012, 06:32 AM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 28
Posts: 8,661
Wiki Edits: 0

Thanks: 16
Thanked 277 Times in 259 Posts
Many autoparts stores will rent you a timing light for free with a deposit. if you're only working on that one engine it makes little sense to buy one. Also check for loose spark pulg connectors at the plug or cap side. Also possible arcing from the plug wires.
Reply With Quote Quick reply to this message
  #30 (permalink)  
Old 06-22-2012, 08:24 AM
malc's Avatar
Living At The Speed Of Life
 
Last photo:
Join Date: Jun 2003
Location: España Right Coast
Age: 63
Posts: 3,240
Wiki Edits: 0

Thanks: 86
Thanked 68 Times in 65 Posts
I could´nt have done anything to my Quadrajet without Doug Roe´s book
Rochester Carburetors.

Not a Rochester, a Demon and me using the wrong gasket caused
unimaginable agony.
Be very sure of your carb rebuild before you go down the same
"tear the engine apart" route I did.
Reply With Quote Quick reply to this message
The Following User Says Thank You to malc For This Useful Post:
John long (06-29-2012)

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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 for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Carb rebuild - won't start now. Please help? joe99 Engine 6 11-30-2011 03:04 PM
Edelbrock carb. won't fast idle seawolf18 Engine 3 09-09-2011 04:22 PM
Edelbrock Carb Won't Idle Sinister Engine 7 12-21-2009 06:09 AM
center tri carb won't idle... kbyounger Engine 9 05-01-2008 09:08 PM
Truck won't idle...Need Help mudbog42 Engine 14 03-01-2008 03:16 PM


All times are GMT -6. The time now is 12:37 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.