Hello all
This is a Fluke 97 capture of a 2-pin rotary AIC off of a 91 Saab 900T 5spd (similar ones used on VW, Volvos, etc)
The waveform looks fine, IMLE or are those slight lateral glitches in the on/off V lines significant and not artifact?
However, what's perplexing to me is that the AIC, when pulled a few days ago, was seized (by wooden tongue depressor into gap and the quick longitudinal-axis 'wrist snap' . Soaking/cleaning/lubing did not help. It did, however, open/close when battery voltage was jumped to it
Also, idle is fairly stable about 80% of the time at spec'd 850 RPM; 20% of the time it swings between 600 and 1000, sometimes with some ~1 sec interval rapid pulsing; and very rarely a high 1500 RPM.
Sometimes tapping the valve stabilizes the idle; other times not at all
I'm also pursuing other idle-related pathways.
Hopefully the URL below will go through
Waveform sample of a mildly/moderately sticking rotary AIC? And/or what would I see on the scope?
Thank you for any comments,
DirkP in Northern CA, USA
http://new.photos.yahoo.com/dirkpi/photo/294928804156500417/0