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On 25 Feb 2002, at 11:42, Iamkeen@aol.com wrote: > Wanting to run a Level-1 Diagnostic on an auto trans, as per procedures in > Bentley. But Bentley's verbage leaves me with quite a few unanswered questions. For most of us, this level of diagnosis is beyond us. I have used a simple gauge adapted to a 1/8" pipe thread to screw into one of those fittings just to check one of the pressure readings, while I adjust the vacuum modulator. OTOH, in most cases, you can probably do this by just carefully monitoring the shift points. This involves a lot of trial and error, so it's not at all clear to me that this way is easier. It also leaves you wondering whether you actually have it right. > Can anyone who's done this offer a real-world explanation of the whole > vac-pressure testing operation? Alternate methods that have worked for you? How > should these hoses be connected to the test outlets? Are there special fittings > I oughta be looking for, to avoid damaging the connections in the tranny case? > Should I be concerned about the pressure ratings of the hoses I'm using? And > what sort of guages should I be looking for? Use 1/8" pipe fittings, hose rated above the pressure you'll see at that location and gauges that read go high enough for that location. > Also, there's talk of taking > pressure readings & making adjustments with the main vacuum hose disconnected... > and then, later, taking the readings again under driving conditions, with the > hose hooked up. Pulling off the vacuum hose just simulates full throttle conditions. > And if all this pressure testing reveals that something in the valve > body is shot, would I be better off trying to hunt down & replace the actual > broken bit? I think fixing is almost always more likely than replacement with new parts. Also, don't forget that the valve body and governor are a matched pair, so should not be mixed up. - ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/