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Purchased the smoke machine. Took the intake boot off, plugged the lines, plugged exhaust with a tennis ball, and injected smoke down the throttle body. No major leaks.
There were a couple VERY minor leaks coming from where the brake booster attaches to the back of the throttle body and from the idle adjustment screw. So I need to fix those. But doubt that's the cause of my cold start problems.
I then swapped the fuel distributor with one off of a relative's decommissioned '82 911sc (same part number). The reason was that the system pressure always showed 4.3-4.5 bar, which is a bit low, so curious if the other FD showed the same. Which it did... System pressure showed the same 4.4 bar with the alternate FD. Performance is generally the same. Still have the cold start issue.
Still haven't checked CSV. However, I think that's working... Reason being is that it will 'fire' up after first crank when cold (which I think is the CSV performing it's function), but then immediately stalls. Then it takes several cranks to get it restarted.
My next step is to determine why I have the low system pressure. I'm starting to lean towards a blockage/debris in a fuel line. At least that's what I'm tackling next. My pump became very audible after a couple drives with the alternate FD. Which might coincide with the blockage theory? Going to replace fuel filter.
Can I use an air compressor on fuel lines? I want to disconnect fuel pump and accumulator and blow air through that line. Also curious if I can use an air compressor on the accumulator to try and blow out any debris - is that possible? Or could I cause damage?
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