occasional pop noise - El Camino Central Forum : Chevrolet El Camino Forums
El Camino Central Forum : Chevrolet El Camino Forums
 
Ground Up
User Name
Password

Reply
 
Thread Tools Display Modes
  #1  
Old 11-15-2019, 01:30 PM
Jgwalla's Avatar
Jgwalla Jgwalla is offline
Member
Loose Nut
 
Join Date: Jun 2010
Year: 1971
Model: El Camino
Region: 6 (FL)
NECOA #: 16808
Posts: 78
Jgwalla will become famous soon enough
Default occasional pop noise

my 1971 makes an occasional popping noise when idling, everything else shows things are good, its just I'm trying to figure out all this, still learning when it comes to older engines








and with lights









sorry for the lighting issues, its really dreary in fl right now
__________________
1971 El Camino 250 I6 (Currently Being Restored, tires/brakes)
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 11-15-2019, 01:36 PM
JKCamino's Avatar
JKCamino JKCamino is offline
Director Region 19 Owner of the KLRMino

Master Wrench
 
Join Date: Aug 2005
Name: Josh
Location: Vancouver
Year: 1973
Model: El Camino
Region: 19(AK,ID,OR,WA)
NECOA #: 5944
Posts: 1,460
JKCamino is a name known to all
Garage
Default

I could be an exhaust leak.

I can’t remember if this is the right way but you can take brake cleaner and spray it around the exhaust manifold ports and if your idle bumps up then that’s where the leak is.

It was either brake cleaner or propane to help find leaks, I can’t remember
__________________
Custom El Camino Laguna S3 COPO Replica AKA Killer AKA (KLRMINO)



To view links or images in signatures your post count must be 0 or greater. You currently have 0 signatures.

Last edited by JKCamino; 11-15-2019 at 01:42 PM.
Reply With Quote Quick reply to this message
  #3  
Old 11-15-2019, 06:47 PM
Jima Jima is offline
Site Contributor

Master Wrench
 
Join Date: Jul 2016
Name: Jim
Location: Raleigh, NC
Year: 1981
Model: El Camino
Region: 5 (NC,SC)
NECOA #: 71810
Posts: 329
Jima has a spectacular aura about
Garage
Default

Quote:
Originally Posted by JKCamino View Post
I could be an exhaust leak.

I canít remember if this is the right way but you can take brake cleaner and spray it around the exhaust manifold ports and if your idle bumps up then thatís where the leak is.

It was either brake cleaner or propane to help find leaks, I canít remember

NO WAY you should spray anything flammable, like brake cleaner or propane, around the exhaust manifold. Think you're thinking of doing that around the intake manifold to look for an VACUUM leak.
Reply With Quote Quick reply to this message
 
  #4  
Old 11-15-2019, 07:14 PM
87ls5.3's Avatar
87ls5.3 87ls5.3 is offline
Site Contributor

Master Wrench
 
Join Date: Jun 2019
Name: Joe
Location: NE Fort Worth
Year: 1987
Model: Conquista
Region: 13(TX)
NECOA #: 90940
Posts: 214
87ls5.3 has a spectacular aura about
Garage
Default

Um, yea, brake cleaner on intake for vacuum leak test.

I use a piece of heater hose to my ear (about 3 feet) and the other end pokes around the engine bay to pin-point the source of the noise. Usually gets me pretty close.

From the video though, sounds like exhaust leak. If that's it, when the hose gets close I guarantee you will know it!

Joe
Reply With Quote Quick reply to this message
  #5  
Old 11-16-2019, 05:56 AM
pitts64's Avatar
pitts64 pitts64 is offline
Senior Member
Master Wrench
 
Join Date: Jun 2011
Name: Jeff
Location: Pittsburgh
Year: 1969
Model: El Camino SS
Region: 8 (OH,WV)
NECOA #: 19572
Posts: 1,212
pitts64 is a glorious beacon of light
Garage
Default

I do what Joe does, use a piece of 3/8 hose and listen for leaks.

I also don't like the idea of spraying flammable liquids around the ignition..
Reply With Quote Quick reply to this message
  #6  
Old 11-16-2019, 08:11 AM
Mike Zeigler's Avatar
Mike Zeigler Mike Zeigler is offline
Senior Member
Master Wrench
 
Join Date: Jul 2010
Name: Michael Zeigler
Year: 1972
Model: Sprint
Region: 16(CO,MT,WY,UT)
NECOA #: 82162
Posts: 447
Mike Zeigler will become famous soon enough
Garage
Default

In working at a Chevrolet dealer in the mid 70's through the early 80's we saw a fair amount of the pop noise. Once on a brand new pick up right of the carrier, cam shaft wiped a lobe or two off.

My past experiences with a vacuum leak is you should hear a squeal or high pitched whine that gets worse with higher RPM,Maybe check to be sure the intake bolts are tight. An occasional pop leads me to think that the cam is starting to wipe off a lobe. Chevrolet had paid for a lot of cam & lifter replacements in the mid to late 70's.

My 2 cents,Mike
Reply With Quote Quick reply to this message
  #7  
Old 11-22-2019, 05:07 AM
66Elk's Avatar
66Elk 66Elk is offline
Junior Member
NooB
 
Join Date: Nov 2019
Name: Frank Bussey
Location: Marco Island
Year: 1966
Model: El Camino
Region: 6 (FL)
NECOA #: 91726
Posts: 5
66Elk will become famous soon enough
Garage
Default

I had popping with my 350 but that turned out to be spark plug wires being too close to headers and shorting out from time to time.Installed clips to keep wires away from headers.
Fly like the wind
__________________
>>>>Fly like the wind>>>>
Reply With Quote Quick reply to this message
  #8  
Old 11-22-2019, 11:25 PM
Jgwalla's Avatar
Jgwalla Jgwalla is offline
Member
Loose Nut
 
Join Date: Jun 2010
Year: 1971
Model: El Camino
Region: 6 (FL)
NECOA #: 16808
Posts: 78
Jgwalla will become famous soon enough
Default

to be honest im starting to think it was the fuel system, it was hard to get any pressure at first from the system after sitting for a year (without gas) ill tinker with it tomorrow
Reply With Quote Quick reply to this message
  #9  
Old 12-05-2019, 02:02 PM
Jgwalla's Avatar
Jgwalla Jgwalla is offline
Member
Loose Nut
 
Join Date: Jun 2010
Year: 1971
Model: El Camino
Region: 6 (FL)
NECOA #: 16808
Posts: 78
Jgwalla will become famous soon enough
Default

https://youtu.be/EHMxuEqaAIE

Last edited by Jgwalla; 12-05-2019 at 04:54 PM.
Reply With Quote Quick reply to this message
  #10  
Old 12-05-2019, 04:27 PM
Jgwalla's Avatar
Jgwalla Jgwalla is offline
Member
Loose Nut
 
Join Date: Jun 2010
Year: 1971
Model: El Camino
Region: 6 (FL)
NECOA #: 16808
Posts: 78
Jgwalla will become famous soon enough
Default

did find a possible issue, fuel line from tank to pump was leaking slightly, will be fixing tonight, also someone cut the old vent line behind the door
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Smilies
Options

Register Now

In order to be able to post messages on the El Camino Central Forum : Chevrolet El Camino Forums forums, you must first register.
Please enter your desired user 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



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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

Forum Jump

All times are GMT -7. The time now is 01:46 AM.
Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Logos and trademarks on this site are property of their respective owners. Comments are property of their posters, the rest © 2001-2009 by me


 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.