AudiWorld Forums

Audi Original "S" Cars Discussion forum for the Audi Audi Ur S4, Ur S6, S2 & RS2

Are there any special procedures to do a compression test on the 20vt??

Thread Tools
 
Search this Thread
 
Old 01-21-2007, 08:54 AM
  #1  
Member
Thread Starter
 
Chapaarell80's Avatar
 
Join Date: May 2004
Posts: 2,190
Likes: 0
Received 0 Likes on 0 Posts
Default Are there any special procedures to do a compression test on the 20vt??
Have 226k S4 1993 and just one day it won't start, has fule spark and turns over... Do a compression test for the hell of it after pulling plugs, which were all back, and get 100 for the first/most forward cyclender and 50 for the other 4. This was done by just instaling the tester and turning over the car. Need WOT or anything special for the 20vt?? So basicaly if this is the correct way to do it im doing an engine swap tuesday. Also when you try to start it just turns and turns and seems that maybe at most one or two cyclenders are fireing.

TIA!
Chapaarell80 is offline  
Reply Like
Old 01-21-2007, 10:02 AM
  #2  
AudiWorld Super User
 
20VT90q's Avatar
 
Join Date: Sep 2002
Posts: 5,825
Likes: 0
Received 0 Likes on 0 Posts
Default Yeah, hold the throttle wide open when you turn it over. Still, the numbers should be higher than
that!
20VT90q is offline  
Reply Like
Old 01-21-2007, 02:55 PM
  #3  
AudiWorld Senior Member
 
greenaudiurs4's Avatar
 
Join Date: Nov 2006
Posts: 939
Likes: 0
Received 0 Likes on 0 Posts
Default i have tb open to
the way I do it is to have engine temp warm.. then remove all plugs..undo fuel rail power supply..

then check each cylinder
greenaudiurs4 is offline  
Reply Like
Old 01-21-2007, 03:09 PM
  #4  
AudiWorld Super User
 
20VT90q's Avatar
 
Join Date: Sep 2002
Posts: 5,825
Likes: 0
Received 0 Likes on 0 Posts
Default
Yep, you don't want fuel washing down the cylinders and getting into the oil.
20VT90q is offline  
Reply Like
Old 01-21-2007, 04:10 PM
  #5  
AudiWorld Super User
 
MiniMan's Avatar
 
Join Date: Jan 2005
Posts: 7,628
Likes: 0
Received 0 Likes on 0 Posts
Default
Uhhh ohhhzz! How much does this affect your results?
MiniMan is offline  
Reply Like
Old 01-21-2007, 04:52 PM
  #6  
AudiWorld Super User
 
UrS4boy's Avatar
 
Join Date: Feb 2001
Posts: 18,801
Likes: 0
Received 6 Likes on 6 Posts
Default
Just pull fuse No. 17 to kill the fuel pump while cranking.
UrS4boy is offline  
Reply Like
Old 01-21-2007, 09:35 PM
  #7  
AudiWorld Super User
 
quattro90S6's Avatar
 
Join Date: Nov 2002
Location: Allston, MA
Posts: 9,156
Likes: 0
Received 0 Likes on 0 Posts
Default ok i did have fuel cut as well so only air was getting in....
ill do another tomorrow with WOT and see what i get, hopping to have it fully or VERY close to done by 4 or 5 at the latest b/c i have placess to be
quattro90S6 is offline  
Reply Like
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
new problem
couper83
Audi 4000 / Coupe GT Discussion
13
03-20-2008 01:44 PM
ok this is weird. Car failed a compression test without fuel pump fuse - cylinder 1 down 40psi
a4nik8er
A4 (B5 Platform) Discussion
1
04-05-2006 02:29 PM
So the car wont start heres what i came down to CAM SENSOR
germantoy
Audi Original "S" Cars
18
01-10-2006 08:27 PM
fuel injector resistance test
backdoc
A8 / S8 (D2 Platform) Discussion
3
09-13-2004 07:53 AM
No more fire after a compression test ? (1,8T)
DLX64
Performance and Tuning
16
03-05-2004 06:27 AM
Back to Subforum
Audi Original "S" Cars
View Next Unread
Does the Audi CPS part come with the metal bracket and wire connector?




Advanced Search
Quick Reply: Are there any special procedures to do a compression test on the 20vt??


Reply Closed Thread Share

All times are GMT -8. The time now is 02:24 PM.