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Re: Test and clean?
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Posted by aalto (more from aalto) on Fri, 6 Jan 2006 08:45:17 Share Post by Email
In Reply to: Test and clean?, spratel, Fri, 6 Jan 2006 08:09:21
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First, a good starting place might be the purchase of a bentley manual for your car (if you haven't already). Check on amazon (see link at bottom of page) and ebay for it- widely avalable. Many of the items that you asked about are covered in the manual in more detail than i can go into here.

First set of questions:
1. My answer would be: not really. The test is not that helpful and the benefits of cleaning are minimal to none. If the car idles fine leave the AMM alone.
2. Again, the bentley shows the procedure for these tests. However, it is pretty simple. Just connect a multimeter to the switch and move it to its various positions (closed, open, and wide open i think).
3. The check valve is located on or near the valve cover- a small round object in line with vacuum tubing. Blow through it both ways to make sure it is functioning and is intalled in the correct direction. It should block boost pressure from entering the valve cover and allow air flow in the opposite direction.
4. I would expend your effort elsewhere. Nothing really ever goes wrong with the throttle body quite frankly. The only gunk-related problems can be remedied with a toothbrush and some carb cleaner without removing it.

Second set of questions:
1. This strikes me as a ignition related failure. I would look at your ignition control unit and your hall sensor (in the distributor). If the stall is happening at stop lights after you have been on boost them i would suspect a bad turbo bypass valve.
2. If there is vacuum at the throttle body ports that the lines are attached to then there should be vacuum in the lines. If not, then there is a clog somewhere that needs to be fixed. You will have to systematically go through things line by line to locate the problem.
3 + 4. Don't know here. If things are working correctly then the idle should not change as the cars warms (it should sit at 850 like you describe). Don't know why your idle isn't changing when the AIC is unplugged.
5. Please describe the symptoms more fully. Is it a general lcak of power? Does the boost gauge register properly? Have you checked that the vacuum advance unit is holding vacuum? Assuming the tubo unit is mechanically OK (they usually are) i would first check that the vacuum advance module is working properly (suck and blow on its inlet to check that it holds vacuum). Second, i would make sure that the base boost is set correctly (~5-6 psi if i remember correctly). Third, i would make sure that you are not stuck at base boost somehow.



posted by 24.82.2...

Saab 900 16 Valve Service Manual: 1985-1993/Including All Turbo Spg, and All Convertible

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