[Schulisco]

Didn't answer yet.

Originally Posted by AFB24911S

@Schulisco, true; because the corrosion didn't move when I swapped the injector lines, that makes me think that the corrosion must be in the injector or the line, not the fuel distributor. For example, when I started testing, fuel coming out of injector #2 was darker than the rest. I then moved the fuel line going to cylinder #2 from its position on the fuel distributor to position #3; the corrosion stayed at cylinder #2 even though it was getting fuel from cylinder #3's old position on the fuel distributor.

Does that conclusion make sense, or am I missing something?

Whenever there's corrosion in the system, you can to expect it everywhere. If you're lucky only single components are affected. The fuel lines are made of steel (afaik no stainless steel) but they won't corrode that quick and much as many other components.

Originally Posted by AFB24911S

Update! After my mechanic (3R Racing/Performance) replaced the fuel injectors and the fuel injector sleeves, the low engine speed response and smoothness improved drastically. No more chugging at 1,200 RPM in first or second, much smoother.

Good progress!

Originally Posted by AFB24911S

The cold start didn't change at all, however, and the idle speed went down a lot. So, more vacuum leaks to find and more CIS gremlins to defeat.

Cold start is mostly affected by mixture/amount of fuel delivered (and therefore system & control pressure), constant fuel delivery (fuel accumulator & check valve), correct ignition timing and tightness of the CIS system.

Originally Posted by AFB24911S

The revs seem to drop more rapidly than they used to. I think I'm going to test the rev hang valve first.

These are the effects I mentioned earlier. The behaviour of the system after resolving some issues might by controversal against expected as still some issues persist.

The reason for the quicker drop of revs is that less air is available as some leaks have been sorted out. So this quick drop should lead to check the AAV for correct function. Also check the mixture now, I expect it a bit richer now. Also check the injection begin / basic setup of CIS as I mentioned earlier in #12.

Thomas