compression check - The Saab Link Forums

Go Back   The Saab Link Forums > Saab NG900 '94-'98 and 9-3 '99-'02 Forum > Car Problems? NG900 or old 9-3 Only

Car Problems? NG900 or old 9-3 Only If you're experiencing problems with your NG900 or 9-3, post your question in here. CEL Code or GTFO!

SaabLink.net is the premier Saab Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools
Old 07-26-2014, 08:21 PM   #1
gdc
SAAB Road Master
 
Join Date: Feb 2012
Posts: 373
compression check

Any body know how to do a compression check on a T5 2.0 turbo ?
gdc is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 07-26-2014, 08:23 PM   #2
Elder
 
Cark's Avatar
 
Join Date: Aug 2004
Location: Newfound Lake, NH
Posts: 3,600
Send a message via AIM to Cark
same as any other engine. Get a compression tester (~$25 at harbor freight), pull the DI and plugs, pull the fuel pump fuse, run your test.
__________________
08 9-5 Aero S/C
85 900 turbo - T5
Cark is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 07-26-2014, 08:33 PM   #3
gdc
SAAB Road Master
 
Join Date: Feb 2012
Posts: 373
Harbor Freight ! ,
Thanks Cark,
Ive never done it on any other car, How do you run the test is it just use the compression tester, do I have to turn the engine over ?
gdc is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
 
Old 07-26-2014, 08:48 PM   #4
Elder
 
Cark's Avatar
 
Join Date: Aug 2004
Location: Newfound Lake, NH
Posts: 3,600
Send a message via AIM to Cark
do a quick google search, some good tips on the procedure, but it's quite simple.

You will obviously pull the DI to get the plugs out, so no spark, but also make sure to pull the fuel pump fuse so you're not dumping fuel in! Only hand tighten the tester into the spark plug hole, if you crank it down hard you'll split the rubber o-ring and it will leak and show very low compression. Crank the engine about 5 times with the throttle wide open/gas pedal to the floor. This way air can get into the combustion chamber. If you don't open the throttle very little air will get in and you'll show low compression.

The goal of the test is not to look for a certain high #, but to look for evenness across all cylinders. Ideally they should all be within about 10 percent of each other. If you have one the reads much lower than the others, you've got a problem and more digging to do...
__________________
08 9-5 Aero S/C
85 900 turbo - T5
Cark is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 07-28-2014, 06:05 AM   #5
Wagon Shaggin'
Site Moderator
 
Saabeh's Avatar
 
Join Date: Mar 2007
Location: Ayer, MA
Posts: 6,706
Having two people makes it much easier. One person controlling the key cranks and throttle, the other on the comp gauge.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Quote:
The only reason it took all day to install was because we couldn't keep our dicks out of each others mouths.
Saabeh is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Old 07-28-2014, 06:57 AM   #6
Elder
 
Cark's Avatar
 
Join Date: Aug 2004
Location: Newfound Lake, NH
Posts: 3,600
Send a message via AIM to Cark
My comp gauge has a long enough hose I can hold it to the glass with a wiper blade so I can watch while I crank
__________________
08 9-5 Aero S/C
85 900 turbo - T5
Cark is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiTweet this Post!
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the The Saab Link 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:
Vehicle Info.
Enter your vehicle information (year, model, mods)
Insurance
Please select your insurance company (Optional)

Log-in


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



All times are GMT -8. The time now is 08:23 AM.


Powered by vBulletin® Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.5.2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
All content is copyright The Saab Link and it's original authors.


 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.