Runs rough/intake popping when secondaries kick in. - Page 3 - 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
  #31 (permalink)  
Old 06-20-2013, 09:21 PM
Registered User
 
Join Date: Jun 2013
Posts: 42
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Well, it runs great. Go figure. 'Stomped' on it a ton of times, and she pulls clean until she can't pull anymore. Rev it in neutral, and it's clean too. Go figure. Still have the dripping problem from the primaries after shutting it off, but at least we can go wake surfing now.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #32 (permalink)  
Old 06-20-2013, 10:01 PM
Registered User
 
Join Date: Feb 2013
Posts: 91
Wiki Edits: 0

Thanks: 0
Thanked 12 Times in 12 Posts
Its possible you had an air leak at the fuel pump inlet line or any other section of the line you touched a connection on as I rather doubt a bad fuel pump would suddenly decide to work properly. Then again some foreign matter in the float bowl that had come dislodged with all the hauling back and forth you did ... hard to say.
Reply With Quote Quick reply to this message
  #33 (permalink)  
Old 06-20-2013, 10:34 PM
Registered User
 
Last photo:
Join Date: Jun 2013
Posts: 22
Wiki Edits: 0

Thanks: 0
Thanked 7 Times in 6 Posts
if its popping through the intake upon hitting the secondaries that mens the secondary circuit is lean try lightening the secondary spring see if it gets worse or better may need also a bigger metering plate in the rear may possibly need a bigger carb. check with a timing light to see if distributor is advancing how much and may be to slow.
Reply With Quote Quick reply to this message
  #34 (permalink)  
Old 06-21-2013, 08:34 AM
Registered User
 
Join Date: Jun 2013
Posts: 42
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
I think this has been a sequence of clearing up issues. From the replacement of the coil until possibly simply burning some 'bad' fuel, as well as maybe incidentally fixing an air leak, it all worked out.

Anyone have an idea about the fuel dribbling into the carb from the primary jets after I shut the engine off? It's enough to cause too much fuel to be in the engine for the next start up....so it takes awhile to crank that out and get a good mixture.

*************

Last edited by 68NovaSS; 07-25-2013 at 01:51 PM. Reason: Use the free classifieds
Reply With Quote Quick reply to this message
  #35 (permalink)  
Old 06-21-2013, 09:21 AM
Registered User
 
Last photo:
Join Date: Nov 2006
Location: Woodstock
Posts: 848
Wiki Edits: 0

Thanks: 2
Thanked 68 Times in 62 Posts
Not sure if the Holley has similar parts or comparable parts that a Quadrajet has, but I also experienced rough running/popping when the secondaries kicked in, but on a Q-Jet.

After many hours of diagnostics we took the carb apart, there is a cam which lifts the secondary rods up out of the seats, and this plastic cam was broken. A 5 second replacement and the problem was instantly fixed.

peace
Hog
Reply With Quote Quick reply to this message
  #36 (permalink)  
Old 06-21-2013, 12:17 PM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 56
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
I think I mentioned this earlier ..
Holley Heat Shield.


It keeps the heat away from the float bowls, and prevents the thermal expansion of the fuel in them.
Reply With Quote Quick reply to this message
  #37 (permalink)  
Old 06-21-2013, 12:49 PM
Registered User
 
Join Date: Jun 2013
Posts: 42
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
66GMC, good thought. However, it'll do it even after I've only ran the engine for about 30 seconds, so I'm doubting the heat could build up that quick to make a difference. Am I wrong?
Reply With Quote Quick reply to this message
  #38 (permalink)  
Old 06-21-2013, 01:31 PM
Registered User
 
Join Date: Feb 2013
Posts: 91
Wiki Edits: 0

Thanks: 0
Thanked 12 Times in 12 Posts
Hmmm, so only ran for half a minute from a stone cold engine and its dribbling like that. That makes me lean towards a thought of too high a float bowl fuel level and were these floats changed out with new ones or were they reused. Some floats are bad for fuel saturating in a few years time and they will sink deeper into the fuel as a result so even if the level was set mechanically ok, because the float is sinking its the end result that matters. Did you say that this carb doesn't have level check plugs on the side of the bowl ?.
Reply With Quote Quick reply to this message
  #39 (permalink)  
Old 06-21-2013, 02:48 PM
Registered User
 
Join Date: Nov 2004
Location: California
Age: 67
Posts: 828
Wiki Edits: 0

Thanks: 27
Thanked 21 Times in 19 Posts
Check out what Northern Chevy says.

Years ago I had problems with a car, removed and rebuilt the carb. Ran perfect for a short time and then the problem reappeared. I went through this 3 times. Finally, on rebuild kit number 4, I dropped the float (not included in the kit) into a cup of fuel. It sank to the bottom. I refer to this to this day as "the carburetor float that didn't".

Best of luck.

PatM
Reply With Quote Quick reply to this message
  #40 (permalink)  
Old 06-21-2013, 03:52 PM
Registered User
 
Join Date: Jun 2013
Posts: 42
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Awesome info. The floats were re-used. I'll probably pop the float bowls off next week and check. Thanks!!!
Reply With Quote Quick reply to this message
  #41 (permalink)  
Old 06-24-2013, 08:21 AM
Registered User
 
Join Date: Jun 2013
Posts: 42
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
Engine ran great, but when I shut it down, I couldn't get it re-started. I have two new batteries on the boat, the electrical system is simple and visible, I checked voltage drops, and everything was great. I took the starter in to the local parts dealer. The first place was a flop....they had some lady working there that couldn't tell my why the armature tested bad...she said, 'I don't know, it's an electrical thing'.... The second place let me watch the test, and I could see the shaft bearing was completely shot. Replaced the starter ($52), tested the crap out of the engine, and it fires perfectly every time, hot or cold. Still going to check out that fuel dribbling issue, but also going to concentrate on getting this thing ready to sell. Time for another boat! The full repair to make this engine run fantastic is about $150 out of pocket. Whew, thankfully I didn't panic and buy a carb!
Reply With Quote Quick reply to this message
  #42 (permalink)  
Old 06-25-2013, 10:24 AM
66GMC's Avatar
Get in, sit down, hang on
 

Last journal entry: Cab Removal
Last photo:
Join Date: May 2005
Location: Olds, Alberta Canada
Age: 56
Posts: 2,761
Wiki Edits: 0

Thanks: 32
Thanked 90 Times in 85 Posts
Yeah, 30 seconds run time wouldn't generate enough heat to do that, and I think those that suspect the floats are probably right.

I'm not sure if you've ever confirmed the List Number of your carb or not.
I had presumed List #80551 earlier, which would have used a nitophyl side-hung float ... Holley #216-43.

I don't see a brass float option listed for those internally adjusted needle & seats ... but you could call or e-mail Holley Tech and ask them.
Reply With Quote Quick reply to this message

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
suddenly runs really rough 23 tbucket Engine 16 07-21-2012 02:39 PM
350 ramjet runs rough adrepair Engine 2 11-21-2011 10:31 AM
need more low end, secondaries kick in hard, timing or jetting?? 350cruiser Engine 6 09-29-2011 09:05 PM
Engine runs rough. lt1bbody Engine 19 09-13-2005 01:27 PM
Runs Rough when Cold airman_turtle Engine 6 07-21-2005 01:25 PM


All times are GMT -6. The time now is 12:40 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.