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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,225
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Just seeing this, since I was traveling the past two weeks.
My 1973 has a hand throttle, so I removed most of the cold start stuff and plumbing--AAV, ARV, pipes and hoses. I just have the CSV and TTS now, and the vacuum thermo valve to the WUR. I use the hand throttle to keep it idling for a couple minutes. It also works as a poor man's cruise control.
I have found that the tendency for RPM to hunt at idle often results from slightly too much timing advance at idle. Try reducing the timing advance a couple degrees at idle and see if it still hunts. If so, then focus on getting the advance curves (mechanical and vacuum) working to give you less advance at idle.
BTW, per others here, 28 degrees of mechanical advance is a lot for a twin-plug engine. Try 25. I'll bet if you just retard the dizzy 3* to get 25* advance, and that also reduces the idle advance by 3*, your hunting will reduce or go away.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 05-16-2025 at 11:12 AM..
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