rough idle! - 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
  #1 (permalink)  
Old 01-25-2002, 12:58 PM
Registered User
 
Join Date: Oct 2001
Location: richmond va
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post rough idle!

hello,
i recently rebuilt my `79 chevy 305, i added a high pro cam and a big holley carb !
my problem is now, three months later my engine is idling badly until i remove the pcv valve (wich has been replaced several times)!
does anyone have a idea of where i may have gone wrong?

p.s.
the cylinder heads came off a chevy 350, the intake is stock.
next week i plan to purchase new heads and performance intake. can this solve my problem?

thanks,
reggiesr <img src="confused.gif" border="0">

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-25-2002, 03:54 PM
carnutjoef's Avatar
Member
 
Join Date: Nov 2001
Location: Meriden, Connecticut
Age: 69
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

What do you mean idling bad? What size carb did you put on the engine and what is the lift and duration of the cam? Did you ask the cam company for a recomendation or go with the big lift? The more radical the cam the higher idle your going to see. Your cam maybe good for track and bad for the street. Talk to the cam manufacturers rep, he should give a starting point to solve the problem. The Car Nut Joe
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-25-2002, 04:09 PM
Member
 
Join Date: Dec 2001
Location: Gulf Shores, AL USA
Posts: 78
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

I can't tell you why (I'm sure someone will be telling you soon though), but 350 heads will not work on a 305. The 305 is the only small block chevy that you can't exchange heads on. It's probably amazing that the motor ever started at all.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-25-2002, 04:15 PM
New Member
 
Join Date: Jan 2002
Location: Seattle
Posts: 28
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Reggie: It sounds like you have a vacuum leak associated with the PVC plumbing. Block off the pvc and see if it runs more smoothly. Be sure that all your hoses are plugged in properly and that you have no open plugs in your carburetor, intake manifold etc.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-25-2002, 07:11 PM
Member
 
Join Date: Dec 2001
Location: Gulf Shores, AL USA
Posts: 78
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

reggiesr, got your e.m., and yes you can e-mail me direct if you have any other ?'s just make sure I have a reply address. I just got back into rodding about 2 years ago and I'm kinda relearning things that I once knew alot about, so don't always take my word or anybody elses as the final word. Except maybe Roy.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-29-2002, 06:23 AM
carnutjoef's Avatar
Member
 
Join Date: Nov 2001
Location: Meriden, Connecticut
Age: 69
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Hi Reggie, e-mailed you it didn't go through. get me your address, i'll try to help out where I can. Joe the Car nut
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-29-2002, 08:47 AM
Henry Highrise's Avatar
Lost in the 60's
 
Last wiki edit: Removing stuck fasteners Last photo:
Join Date: Dec 2001
Location: Dixieland
Age: 69
Posts: 15,189
Wiki Edits: 4

Thanks: 0
Thanked 11 Times in 10 Posts
Post

I will have to go along with Joooooe, I thought the only heads that would work with a 305 were 305 heads. Maybe that is your problem.
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:
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



All times are GMT -6. The time now is 07:47 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.