Engine not running right after long term storange - 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 06-16-2013, 07:59 PM
Registered User
 
Join Date: Aug 2012
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Engine not running right after long term storange

I have a 69 396 BB engine. The engine was totally rebuilt 10 years ago and I installed new rod bearings, rings, mild performance cam with timing gears, and ground the valves and seats. When the engine was fired up it ran like a fresh motor, not issues. It had a stock points ignition and a 4 barrel Qjet.
The engine then sat for 8 years due to unexpected issues in life. I rebuilt the carb to insure no stale gas/varnish issues. Upgraded to a new HEI distributor and new wires. I insured that the distributor was installed correctly ( #1 at TDC with rotor pointing to #1 tower). Fired it up and the vacuum gauge fluctuates rapidly between 11-14 inches. It occasionally backfires through the muffler. Adjusting the timing does not improve the symptoms. Any ideas on the root cause? Sticking valves?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-16-2013, 08:18 PM
Faith - Respect - Trust
 
Last photo:
Join Date: Sep 2012
Location: Ontario
Age: 58
Posts: 3,508
Wiki Edits: 0

Thanks: 192
Thanked 638 Times in 572 Posts
Sticky valves could cause rough running but, my concern would be the vacuum, check for vacuum leaks, could be caused due to gaskets (intake gaskets) shrinking and leaking. Try running the engine and spraying a product like wd48 on the intake and head mating surface for example...if the vacuum gets more stable, you have found your problem.

Hope this helps

Ray
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-16-2013, 08:51 PM
TonkaYJ's Avatar
Registered User
 

Last journal entry: Took her out for a drive Oh Ya! Gotta Love an LS powered early Vette
Last photo:
Join Date: Jul 2010
Location: Milwaukie OR
Posts: 56
Wiki Edits: 0

Thanks: 10
Thanked 1 Time in 1 Post
do you have a new wire ran to the dist Batt. wire needs full 12 v the stock wire to the coil + is a resistor wire and has only 9v ? vauum bounce with rpm could be a stuck valve
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-16-2013, 09:35 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 9,087
Wiki Edits: 0

Thanks: 17
Thanked 333 Times in 313 Posts
Could be a goofed carb rebuild. Very easy to do and it was the only thing that was changed.
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
Just Joined, Have Several Long Term Projects DAD128 Introduce Yourself 1 12-28-2011 03:26 PM
Long Term Storage Mike1971pu General Rodding Tech 14 04-06-2009 07:30 PM
long term primer chevyman992002 Body - Exterior 16 05-04-2005 11:36 PM
Long Term Engine Storage 6T5FIVESPD Engine 10 01-12-2004 04:51 PM


All times are GMT -6. The time now is 11:40 AM.


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.