is there a way to check if pcv valve is stuffed without pulling motor apart?

[slowandlow]

is there any way i can check the operation of the pcv valve without all the drama of changing it? the reason i ask, is my v6 vt has a code 36 i cannot locate. the engine was replaced (not for this code), O2 sensors replaced all plugs and leads no manifold or injector leaks. no tb leaks or iac, tps or dirt issue there egr valve works ok (tested these parts with tech II). no hose or egr pipe leaks.
the car idles a few hundred rpm high. then when the fan comes on, it sets of the code 36 (vaccumm leak). it also flares up to nearly 1500 rpm then back to 200 rpm too high again, in park, after this code happens. the mechanic i have looking at it installed the lpg system (oh, its duel fuel ). they are thinking its a tossup between the pcv valve, the pcm, or (and they suspect this mostly and want to work this next time) the wiring loom. the reason they said they suspected the wiring loom is, that they had to swap the injector wiring from one bank to the other side to get the car to run on petrol (before i replaced the motor prior). i guess they are thinking that the wiring change is stuffing with the pcm (can they check the entire pcm funtionality with a tech II tool also?)
anyway, hoping there is some simpler test i can do to check the pcv valve...... maybee blocking a pipe to the valve or something similar. that could at least eliminate that possibility, and i would feel more confident in their wiring loom idea. if i pay for another $300 job and it doesnt fix this ill sceaaammmm!!! (in my mind )
i hope someone knows some test trick anyway.
cheers all

[delcowizzid]

is this an ecotec if so with the injector wiring on wrong sides will make it do weird stuff as it will be shooting gas at closed valves instead of open ones each injector plug can only goto 1 cylinder its designed to go to

[slowandlow]

jeez, thats actually totally obvious when you think about it for a second+
thanks man. thats a really good explanation. thats how my mechanic shoulda said it to me possibly. just as well he's a funny bugger and a nice bloke.... and maybee just a tad crazy (kieth linnel)
i still wouldnt mind checking the pcv if i can easily, but the wiring sound like it needs changing back for sure
thanks again delcowiz

[Not_An_Abba_Fan]

Yep, the ecotec has sequential injection, not like the older non ecotec. (I refuse to identify it as a Buick, they are both Buicks). If injector wiring has been swapped, then you are firing the injectors before the valves open. You have changed the injector sequence to 2 5 6 3 4 1, are the leads on the correct coil?

[slowandlow]

i dunno now... just went and checked it then. all the leads go from the correct coil to the correct plug. i also looked at the injector terminals, and i dont see that the loom has swapped sides at all, cos the iac and tps wires can only be on one particular side (where the throttle body is). im prett sure they havent reversed them on the same side either. im pretty sure i've misunderstood the mechanics explanation. ill have to ask the guy again what it is he has done and what he has in mind to change back to how it was or whatever is going on, LOL.
im not letting him do anything unless he can explain it to me so i understand this time. i am capapble of understanding mechanical stuff to some degree, so he should be able to give me the gist of it i figure. oh, and with it making sense of course. haha
thanks for the idea of referencing if the leads where right or not NOT AN ABBA FAN

[Not_An_Abba_Fan]

That sequence is not right, only if the injector wiring has been swapped left to right, then that is the way the injectors would be firing when in fact they should fire 1 6 5 4 3 2.

*Edit: Right you are Brett, changed it to that. My brain was not on this morning.

[Brett_jjj]

The firing order of the buick and ecotec V6 is 1 6 5 4 3 2 .