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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,225
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Duc: You filled in some information above, please describe any differences when starting cold, or warm, or immediate warm restart. I agree that the O2 sensor should not make any difference during warm or cold start. The ECU should be open loop, so O2 should have no effect. Try starting without O2, then plugging it in when running, as you mentioned.
Next diagnostic procedure: Squirt starting fluid into the intake during a cold start and then during a warm start to determine whether it's lacking fuel or spark.
Do you hear the fuel pump running when the key is on? I don't think the 1975's had the CIS fuel pump safety switch, so the fuel pump ran whenever the key was on. BUT, your installation of the 3.6 and ECU may have changed that part of the wiring.
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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!
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