Question about 1998 Saab 900
Low / uneven idle problem can cause by a lot of components.
Dirty air filter
Dirty injectors + o-rings
Vacuum leak at intake manifold and vacuum hose.
Bad Idle Air Control Motor (IAC)
Low compression (170 psi + is OK)
Start cleaning and repair these trouble spots and see is there any improvement.
For more advance DIY'er then you may try this.
Use a can of Berryman carburetor clean to locate the vacuum leak.
SEE SAMPLE PICTURE HERE
This is a 20-30 minutes job.
Vacuum leaks can occur in following locations.
Intake manifold AND/OR vacuum lines.
Intake manifold is not accessible unless the engine head if off.
You can still check the potential leak by spraying some Berryman near the intake manifold.
Listen for rpm increase after you introduce the Berryman (FUEL) at idle.
Do the same starting from the brake booster unit (the round unit) on the drive side fire all.
Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.
Get a friend to HEAR the ROM increase or monitor for RPM on the tech.
DO NOT AIM the Berryman into any heat source.
PLEASE RATE my answer if it is useful to you.
Posted on Dec 14, 2009
Your throttle body maybe dirty inside.clean it up.if this doesnt help check power going into your throttle position sensor and make sure your idle control valve is not blocked.these are all possible causes for your problem.
Posted on Oct 04, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jul 15, 2015 | Cars & Trucks
Sep 13, 2013 | Cars & Trucks
Apr 08, 2013 | 1993 Buick Century
Nov 27, 2012 | 2008 Chevrolet Trailblazer
Aug 15, 2012 | Chevrolet K2500 Cars & Trucks
Jul 10, 2012 | Ford Expedition Cars & Trucks
Apr 29, 2011 | 1997 Mercury Mystique
Sep 27, 2009 | 1993 Plymouth Voyager
Jul 27, 2008 | 2004 Dodge Stratus
Jun 25, 2014 | 1998 Saab 900
Apr 25, 2014 | 1998 Saab 900
308 people viewed this question
Usually answered in minutes!