...

Go Back   Lateral-g Forums > Technical Discussions > Engine
User Name
Password



Reply
 
Thread Tools Display Modes
  #1  
Old 10-25-2020, 03:32 PM
Timberline's Avatar
Timberline Timberline is offline
Member
 
Join Date: Sep 2008
Posts: 52
Thanks: 0
Thanked 10 Times in 6 Posts
Default LS3 sound like itís popping popcorn

I have a new GM crate motor LS3 525 and the first time I started it the engine purred like a kitten. Two weeks later I finally get back to take the car for a test drive and it sounds like it is popping popcorn out the pass side tail pipe.

Clarification I didn’t get the car out of ten drive way. Rev it easy to 2000rpm let it go back to idle it pops several time. Slowly take the revs to 3000rpm slowly bring it back to idle it pops even when the revs are climbing.

Any ideas where to start looking?
__________________
Jeff
66 Nova Sport Coupe
Detroit Speed equipped front and rear
LS3 525hp, t-56 6spd
Build in progress

Last edited by Timberline; 10-25-2020 at 03:37 PM.
Reply With Quote
  #2  
Old 10-25-2020, 07:12 PM
randy randy is online now
Senior Member
 
Join Date: Jan 2011
Posts: 984
Thanks: 3
Thanked 38 Times in 27 Posts
Default

Any check engine light? Do you have access to a scanner? Can you view any misfires? Can you post a video?
Reply With Quote
  #3  
Old 10-25-2020, 10:21 PM
carkrazy1987's Avatar
carkrazy1987 carkrazy1987 is offline
Senior Member
 
Join Date: May 2006
Location: WPB, Florida
Posts: 243
Thanks: 0
Thanked 0 Times in 0 Posts
Default

scan tool, check for a misfire. check make sure all your spark plug wires are on tight, none backed off. post a video if you can
__________________
1960 Chevy C10 Apache
1969 Chevy Nova
1991 Mazda 323, (Sh*tBox)
Reply With Quote
  #4  
Old 10-26-2020, 01:23 AM
Timberline's Avatar
Timberline Timberline is offline
Member
 
Join Date: Sep 2008
Posts: 52
Thanks: 0
Thanked 10 Times in 6 Posts
Default

Thanks
the check engine light did come on mid way through the run will check plug wires again.
I did have a 13 second video but it wouldn’t load.
Don’t have access to a scan tool.
__________________
Jeff
66 Nova Sport Coupe
Detroit Speed equipped front and rear
LS3 525hp, t-56 6spd
Build in progress
Reply With Quote
  #5  
Old 10-26-2020, 07:14 AM
dhutton dhutton is online now
Senior Member
 
Join Date: Nov 2006
Location: Mountain Springs, Texas
Posts: 1,604
Thanks: 403
Thanked 132 Times in 89 Posts
Default

If you are going to mess with cars like this you need to spend $50 on a scanner that can reset codes.

Don
Reply With Quote
  #6  
Old 10-26-2020, 03:12 PM
randy randy is online now
Senior Member
 
Join Date: Jan 2011
Posts: 984
Thanks: 3
Thanked 38 Times in 27 Posts
Default

Guessing a plug wire came off. Unburnt fuel entering the chamber causing popping. Need a scan tool. Go to any parts store or Walmart and pick one up. If you were local to Dallas I would help you
Reply With Quote
  #7  
Old 10-26-2020, 06:50 PM
Timberline's Avatar
Timberline Timberline is offline
Member
 
Join Date: Sep 2008
Posts: 52
Thanks: 0
Thanked 10 Times in 6 Posts
Default

Thanks will be picking up a scanner. I did check the plug wires last night and the boots were as they should be on the coil pack and plugs. Pulling the plugs tonight to check them out.

I agree I unburnt fuel popping. Just need to figure out which cylinder.

I appreciate everyoneís input. I am old school engine guy.... the new electronic motors are a different beast for me.
__________________
Jeff
66 Nova Sport Coupe
Detroit Speed equipped front and rear
LS3 525hp, t-56 6spd
Build in progress
Reply With Quote
  #8  
Old 11-07-2020, 03:57 PM
Timberline's Avatar
Timberline Timberline is offline
Member
 
Join Date: Sep 2008
Posts: 52
Thanks: 0
Thanked 10 Times in 6 Posts
Default

Wanted to follow up on what I found. Pulled plugs all looked good except #8 it was black swapped it with #2 appeared to clean up a little but still a dead plug. Replaced and all is good.
__________________
Jeff
66 Nova Sport Coupe
Detroit Speed equipped front and rear
LS3 525hp, t-56 6spd
Build in progress

Last edited by Timberline; 11-07-2020 at 04:08 PM.
Reply With Quote
The Following 2 Users Say Thank You to Timberline For This Useful Post:
camcojb (11-07-2020), dhutton (11-08-2020)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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 -5. The time now is 10:30 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Copyright Lateral-g.net