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Re: Evap. emission system questions, 2000 Viggen
Posted by saabdoc [Email] (more from saabdoc) on Thu, 16 Apr 2009 18:15:54
In Reply to: Evap. emission system questions, 2000 Viggen, ramblerdrver, Thu, 16 Apr 2009 17:46:14
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The 205/235 engines have the canister in the rear.
The engine control module closes the shut off valve when its testing the system for leaks. When the shut off valve closes, it opens the purge valve which applies a vacuum to the fuel tank. If the computer doesn't see a drop in pressure (vacuum) in the tank, or the vacuum doesn't hold when it closes both valves, it thinks there is a leak in the system.
One of the most common problems, and for some reason, overlooked problems is the purge valve. If it never opens (sticks closed) during the evap test when the control module thinks that its open, then there is goin to be no drop in pressure (vacuum) reaching the fuel tank. So the engine control module thinks there is a large leak.
I hope this info helps you.
posted by 71.110.4...
Posts in this Thread:
- Evap. emission system questions, 2000 Viggen, ramblerdrver, Thu, 16 Apr 2009 17:46:14
- Re: Evap. emission system questions, 2000 Viggen, ramblerdrver, Thu, 16 Apr 2009 19:29:22
- Re: Evap. emission system questions, 2000 Viggen, SWEDECAR
, Thu, 16 Apr 2009 18:34:56 - Re: Evap. emission system questions, 2000 Viggen, saabdoc, Thu, 16 Apr 2009 18:15:54 <-- Viewing This Message
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