N75 WGFV boost valve NFG

[Kenneth Keith]

My valves ohm out at 322 and 323.  I dissected one and the piston isn't frozen.  The intact one appears to also have a free piston.  It appears to me that the coils are not creating a field to move the pistons.  I even checked the dissected piston against a magnet and it is ferrous.

I am a little surprised that the coils can be intact, i.e. not open, and still not move the piston, but I suppose if the resistance is 10x what it's supposed to be then that would be the case.

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Bernie Benz <b.benz at charter.net> wrote:

>Apparently I am having the same problem for a long time now, low boost.
>The coil resistance of the WGFV should be 25 to 35 ohms, mine is just under 300 ohms.
>What is the R of your valves?
>Read somewhere in Bently that during the output test one side of the coil should be at a constant 12V, apparently the ground side is switched?
>Haven’t taken mine out of the car yet but will do so when I get aroundtoit.
>What is the trace number, location of N75 in the Bently schematic?
>
>Regards, Bernie
>
>On Jan 12, 2014, at 12:59 PM, Kenneth wrote:
>
>> Trying to diagnose my low/WG-spring only boost:
>> 
>> So, I just ran the output test on my 200q20v and found that the N75 wastegate frequence valve is not working.  I tried swapping in the one from my parts car, and same thing.  Then I checked the voltage on the connector during the output test, and it appeared to be pretty constant +12v.  There might have been some oscillating, but if so I couldn’t pick it up with my digital multimeter.  There was some fluctuation in the reading, but not what I expected for something that was cycling on and off.  
>> 
>> Then I noticed the connector had +12v anytime the key was on, which I thought was odd so I swapped in a different ECU, but got the same thing.  So then I took both WGFV’s and applied +12v to them, even backwards on the terminals, and didn’t get any hint of movement.  Right now I’m soaking both of them in a bit of PB Blaster.
>> 
>> I think I might be looking at replacing the WGFV with a new or known good one.  Before I do, is there anything I appear to be overlooking or misunderstanding about what I should be seeing at the connector during the output test or with the key “on?”
>> 
>> Is there any way to free up my existing stuck WGFV’s?  I tried pushing down inside it with a thin allen key, but I don’t think I get any movement.  That seems to make sense, because since I’m getting only default/WG spring-only boost levels I believe the valve is stuck open, meaning the piston would already be at the bottom of its stroke since I understand there is a spring inside that puts pressure toward the ports if it’s not stuck.
>> 
>> Now that I have known issue that I can focus on, I’m getting excited to get it fixed.  I still haven’t experienced the full potential of the RS2 parts on it.
>> 
>> Thanks,
>> 
>> Kenneth
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