4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Compression Problem...

Thread Tools
 
Search this Thread
 
Old Apr 10, 2006 | 02:38 AM
  #11  
monkeydude3's Avatar
monkeydude3
6th Gear Member
 
Joined: Sep 2005
Posts: 5,128
From:
Default RE: Compression Problem...

and to my knowledge you could not do a PI swap on one side... the PI heads require the PI intake manifold so it wouldn't all coordinate...
Old Apr 10, 2006 | 09:28 AM
  #12  
4.698GT's Avatar
4.698GT
4th Gear Member
 
Joined: Jan 2005
Posts: 1,984
From: Port Monmouth, New Jersey
Default RE: Compression Problem...

Could be the valve seats, could be the rings, could be a number of things. I can only remember those two at the moment.
Old Apr 10, 2006 | 10:42 AM
  #13  
VARifleman's Avatar
VARifleman
3rd Gear Member
 
Joined: Dec 2005
Posts: 533
From:
Default RE: Compression Problem...

Your drivers side seems to be at the compression that is normal to a PI swap (~10.5, 10.2 in this case), your passenger side is 12.25:1, although I have no idea why it would be that way.
Old Apr 10, 2006 | 11:46 AM
  #14  
rbstang's Avatar
rbstang
6th Gear Member
 
Joined: Apr 2005
Posts: 5,608
From: Wilmington, NC
Default RE: Compression Problem...

now that my ADD drugs have worn off. it sounds like the seals on the pistons are leaking or the piston rings are busted. does it make noise or run like crap?
Old Apr 10, 2006 | 02:28 PM
  #15  
kecclest's Avatar
kecclest
Thread Starter
2nd Gear Member
 
Joined: Jan 2005
Posts: 371
From:
Default RE: Compression Problem...

I have the PI intake manifold... I've read that you can put the PI intake on without doing the PI headswap.
Old Apr 10, 2006 | 02:29 PM
  #16  
kecclest's Avatar
kecclest
Thread Starter
2nd Gear Member
 
Joined: Jan 2005
Posts: 371
From:
Default RE: Compression Problem...

My car runs fine. It was bogging down in second when I powershifted from first, but I changed the spark plugs, and now that problem is gone. How can I check to make sure the timing is correct on one side or another?
Old Apr 10, 2006 | 02:31 PM
  #17  
kecclest's Avatar
kecclest
Thread Starter
2nd Gear Member
 
Joined: Jan 2005
Posts: 371
From:
Default RE: Compression Problem...

My car runs fine. I don't see how all the passenger side rings could have gone bad at the same time and with such precision.
Old Apr 10, 2006 | 03:07 PM
  #18  
2VNA's Avatar
2VNA
4th Gear Member
 
Joined: Feb 2006
Posts: 1,018
From:
Default RE: Compression Problem...

the tool you used? was it new or a rental? That could be the problem right there. I like to look at the cheep way's first before tearing things appart. What plugs did you put copper?
Old Apr 10, 2006 | 03:11 PM
  #19  
kecclest's Avatar
kecclest
Thread Starter
2nd Gear Member
 
Joined: Jan 2005
Posts: 371
From:
Default RE: Compression Problem...

It was a rental from AutoZone, but i was the first to use it (I saw him taking the plastic off of the box). The entire driver side read about 180, and the entire passenger side read 150. I put Bosch Platinums on it because I didn't want to put the old nasty looking ones back on.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
baddog671
Archive - Parts For Sale
20
Jul 26, 2016 01:20 PM
uedlose
The Racers Bench
4
Oct 1, 2015 08:31 PM
bconboy
2005-2014 Mustangs
16
Sep 21, 2015 12:52 PM
uberstang1
Classic Mustangs (Tech)
6
Sep 20, 2015 06:42 PM
1st 4 eyed fox
General Tech
2
Aug 24, 2015 06:56 PM




All times are GMT -5. The time now is 10:19 PM.