chevy 350 running rough - 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 03-26-2011, 07:06 PM
Registered User
 
Last photo:
Join Date: Jan 2009
Location: hillsboro or
Posts: 161
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
chevy 350 running rough

I just got the engine back in my truck after some frame straitening and now its running rough. it was running fine before i pulled it. it starts and idles ok now. but when i rev it it kind of stalls and then slowly revs up. it sounds like its missing on a cylinder, but i checked all of them and there all firing.

recent tune up about 1000 miles before it was pulled. plugs, wires, cap, rotor.

i got a 15 to 17 vacuum reading. timing is at 5 atdc. compression ranges from 135psi to 150psi. isnt running rich or lean from what i can tell from the plugs and exhaust.


completely stock chevy 350 in a 1979 chevy 1 ton.



im a little confused on what it could be. im a diesel mechanic and have forgotten most i learned about gas engines.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-26-2011, 07:10 PM
adantessr's Avatar
'23 T-Bucket Pickup
 
Last wiki edit: Troubleshooting ignition Last photo:
Join Date: Jun 2010
Location: South Charleston , WV
Age: 62
Posts: 1,549
Wiki Edits: 3

Thanks: 43
Thanked 17 Times in 15 Posts
Your timing needs to be at 12 to 14 btdc, with the vacuum disconnected . Go from there. Allan
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-26-2011, 07:31 PM
Registered User
 
Last photo:
Join Date: Mar 2011
Location: hamilton ont. canada
Age: 39
Posts: 180
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
18436572 just in case a wire or two came off and went back on in the wrong spot
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-26-2011, 09:39 PM
Registered User
 
Last photo:
Join Date: Jan 2009
Location: hillsboro or
Posts: 161
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
im assuming by "disconnect the vacuum" you mean the vacuum advance on the distributor and plug it.

after i did that i had 6 to 7* btdc. then adjusted the distributor so the timing was at about 14* btdc.

it runs better than it did before i pulled the engine except for the short stall before it revs. maybe the accelerator pump? it doesnt pump as much as it used to when you look down the carb and pull the throttle, but it will still flood the engine if you pump it too much.
i rebuilt it not that long ago with all new gaskets and accelerator pump.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-27-2011, 10:53 AM
adantessr's Avatar
'23 T-Bucket Pickup
 
Last wiki edit: Troubleshooting ignition Last photo:
Join Date: Jun 2010
Location: South Charleston , WV
Age: 62
Posts: 1,549
Wiki Edits: 3

Thanks: 43
Thanked 17 Times in 15 Posts
Quote:
Originally Posted by jak327
im assuming by "disconnect the vacuum" you mean the vacuum advance on the distributor and plug it.

after i did that i had 6 to 7* btdc. then adjusted the distributor so the timing was at about 14* btdc.

it runs better than it did before i pulled the engine except for the short stall before it revs. maybe the accelerator pump? it doesnt pump as much as it used to when you look down the carb and pull the throttle, but it will still flood the engine if you pump it too much.
i rebuilt it not that long ago with all new gaskets and accelerator pump.
It does sound like a problem with the accelerator pump. Maybe the pump checkball is stuck. JMO
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 03-27-2011, 12:32 PM
bondo's Avatar
Member
 
Last photo:
Join Date: Nov 2002
Location: Chaumont Bay N.Y.
Posts: 960
Wiki Edits: 0

Thanks: 7
Thanked 15 Times in 15 Posts
Quote:
Originally Posted by adantessr
It does sound like a problem with the accelerator pump. Maybe the pump checkball is stuck. JMO
Ayuh,... I agree,... Might even be the fuel Filter,...
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
305 running rough 400smb_s10 Engine 1 02-27-2011 09:04 AM
Chevy 350 running rough at idle The Raven Engine 3 01-07-2010 03:54 PM
chevy 350 crate engine... backfiring and running rough strays Engine 20 10-23-2009 09:05 PM
Chevy 235 missing/running rough countryboytn Engine 15 09-30-2009 09:55 PM
chevy 4.3l help-detonation, running rough briansansone Engine 4 03-20-2007 07:14 PM


All times are GMT -6. The time now is 05:37 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.