Thanks for the info! I'm now a bit more confident that the problem is with the aftermarket adjuster. I will give block 91 a quick check before I pull everything apart. I assume you mean to apply 12v to the solenoid with the car at idle? I should have thought about just checking it as is and see what it shows. I will do so in the morning after it warms up a little.

And I have cleared all the codes numerous times but the P0340 keeps coming back.