My 87 Turbo is currently idling at lower than stock RPMs (500). So, checked all my vacuum lines, both metallic and rubber which look to be all good. I pulled my ISCV and was surprised that it was fairly clean, even the inside chamber after I removed the 3 bolts. There was some black soot and carbon but a few wipes inside of ISCV and where it bolts to intake manifold cleaned everything up.
Check valve and rubber O-ring were also cleaned up.
Doesn't the ECU close ISCV when the engine is shut-off? I'm not sure if my ISCV is in the closed position since the tapered "plug" is not touching the opening of the mounting flange. It looks like the plug needs to travel another 3/16" or so outwards before closing up the opening.
I had started the engine earlier before removing the ISCV and made sure that ISCV made the clicking sounds when the engine is shut-off ( which it did for about two seconds).
Can you all look at my ISCV picture and let me know if this is indeed the closed position?
Thanks in advance.
edit: I also went ahead and checked resistance at the ISCV connections and they are all within spec according to TSRM.