Detonation problem - very very weird - 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 06-19-2008, 04:49 PM
Registered User
 
Join Date: May 2008
Location: alberta
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Detonation problem - very very weird

Parked the camaro last night, came back after work to listen to my baby rumble..

It cranks 30 degrees and then CRACK. Like really bad detonation (rocks in a coffee can). I thought uh oh... valves are hitting a piston.

Took spark plugs ou (except six and five), turns over by hand fine, as far as I can tell.

When the plugs were out, I tried it again... crack. So I turned it over by hand alittle more and smoke came out of the passenger cylinder bank. Oh yeah, smoke came out of the carb a little bit too. When it does this, it sends the engine going backwards a little, stops it dead in its tracks.

Why could this be happening?

Its a 383 with 305 (801's) heads. Only recent changes include swapping the cam and wired the electric choke up.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-19-2008, 04:56 PM
Registered User
 
Last photo:
Join Date: Apr 2008
Location: Benito MB canada
Posts: 95
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Have you had it running before with the new cam? What are the cam specs?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-19-2008, 04:58 PM
Registered User
 
Join Date: May 2008
Location: alberta
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Yeah I ran it alll day yesterday. So really the only culprit is sitting overnight, or wiring the choke up, but I dont think that would do anything.

.464/.464 lift.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-19-2008, 05:03 PM
Member
 
Last photo:
Join Date: Jul 2004
Location: wis.
Posts: 107
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
I would check your starter, and see if the nose cracked or broke. My buddies 69 Camaro had the same symptoms. That was his issue, the starter. Also check the ring gear, and look for any telltale signs of trouble, cracks, gouges, etc.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-19-2008, 05:05 PM
Registered User
 
Join Date: May 2008
Location: alberta
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Will do, its a china ministarter, cause the solenoid on my gm one broke.

Just weird that its lighting something up still.

Thanks.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-19-2008, 05:15 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,657
Wiki Edits: 0

Thanks: 15
Thanked 59 Times in 56 Posts
Check the spark timing, make sure the mechanical advance isn`t stuck open or just simply the timing isn`t too far advanced.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 06-19-2008, 06:35 PM
Registered User
 
Join Date: May 2008
Location: alberta
Posts: 94
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It was indeed the starter, one bolt came loose... very loose.

Thanks all

Does anyone have any links to tuning an edelbrock carb (1406). It doesnt start very well. I cant tell if its too lean or too rich and the choke is really finiky. It takes 6-7 revolutions to start.
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
blower idle rpm problem Ratoflic Engine 7 12-01-2008 03:31 AM
Weird problem in clear coat. BMM Body - Exterior 6 05-09-2008 01:27 AM
Yargh, carbureator problem is driving me nuts (but not my car!) caustic meatloaf Engine 12 05-21-2006 12:41 PM
Weird problem DoubleVision Engine 5 08-01-2004 08:34 PM
Weird Gas leaking problem....help??!?!?! TheZaZ Engine 5 09-21-2003 01:29 PM


All times are GMT -6. The time now is 01:58 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.