1985-1998 [Subscribe to Daily Digest] |
 | [Main 9000 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: how do I test my wastegate ??? Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 2 May 2006 12:14:25
In Reply to: how do I test my wastegate ???, julian santa-rita, Tue, 2 May 2006 11:49:44 Members do not see ads below this line. - Help Keep This Site Online - Signup |
First, a sticky wastegate won't make the BPC work any harder. The wastegate actuator is just a piston that moves under pressure. The BPC vents pressure to the wastegate actuator. But that pressure doesn't change if the wastegate doesn't move, or if it does.
A stuck closed wastegate would show up as overboost. A stuck open wastegate would show up as lack of boost. If you're concerned, two tests-
1 - with a COLD car, reach under the turbo. The wastegate actuator has a rod that goes to a lever under the turbo. The lever rotates slightly. If you pull on the rod, you should be able to move it around 1/4 - 1/2 inch or so, out from the actuator. It will be hard to move - you are pulling against a powerful spring. If it won't move at all, it's stuck.
Why a COLD car? Because if your reach under the turbo on a hot engine, you'll read "SAAB" backwards in your hand for the rest of your life.
2. With a pump, like a Mitty vac or the like, apply pressure to the line to the wastegate actuator. At about 4-5 psi, you'll see the rod on the actuator move. You can't make the actuator move by blowing into the hose with your mouth - human lungs can't produce that much pressure.
posted by 192.249....
, Tue, 2 May 2006 12:14:25 <-- Viewing This Message, Tue, 2 May 2006 13:14:45
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.
 |
 |
 |
 |
 |
