[urq] WoT 2-Way Valve sticking

[Maurits Jonkergouw]

Hi Jim,
  ----- Original Message ----- 
  From: "James Howard" <spam.me1 at ntlworld.com>
  To: "Maurits Jonkergouw" <urq at moregraphics.nl>; "Audifans" <urq at audifans.com>
  Sent: Monday, June 20, 2005 6:11 PM
  Subject: Re: [urq] WoT 2-Way Valve sticking


  Hi Maurits,

  Yes, it does work that way round. I thought it was silly at first, but when 
  you think about it, it makes sense. This means it fails safe - if the valve 
  fails to operate, or the wire loom is broken, or the WOT switch is broken, 
  then you will be stuck in WOT mode. This is good - although it will use more 
  fuel, if it failed and stuck in non-WOT mode, you could cause engine damage 
  by running too lean.

Copy that :-) This explains my rather high fuel consumption over the years ( ~1:7 l/km)

  My WOT switch has only 2 terminals on it and is normally closed. It doesn't 
  matter which way round the wires go.
  If your WOT switch has been replaced with a generic micro-switch, they 
  usually have 3 terminals - Common, N/O & N/C. If this is the case you need 
  to connect to common & N/C

Ahaa! I also have 2 spades but there are in fact 3 terminals on the switch-body. Because it was broken before, I physicly switched terminals and prob. did not notice I made it N/O because it made sense to be N/O... Hense it now switches 12V ON instead of OFF. 
I do not know when the valve broke down of course, but I have been driving around for a long time with a lead foot and a reversed WoT system! Damned good thing it sticks in WoT after failure... so the fail-safe system really works! Guess I need that very expensive switch AND a new valve after all... BTW I could not find a generic switch even after heavy searching, do you know of a source yet?

  If you cannot operate the valve with an extrnal power source, it sounds like 
  it's broken. Can you measure resistance across the 2 terminals on the valve, 
  or has it gone open circuit?

Yes it's broken alright, can't get it to work with an external 12V and the resistance is 2.1 MOhm.
One thing still I don't understand is when I turn on the ignition, I can't see 12V at the valve connector... ummm.


Thanks again,
Maurits


  ----- Original Message ----- 
  From: "Maurits Jonkergouw" <urq at moregraphics.nl>
  To: "James Howard" <spam.me1 at ntlworld.com>; "Audifans" <urq at audifans.com>
  Sent: Monday, June 20, 2005 12:15 PM
  Subject: Re: [urq] WoT 2-Way Valve sticking


  > Thanks Jim,
  >
  > I only measure 12V at the valve connector when ignition is on AND the
  > WoT-switch is activated.
  > This is the opposite of what you say. It doesn't make sense to design a 
  > WoT
  > enrichment-valve-system which switches defaults to WoT at 0V and therefor
  > needs 12V for normal operation and needs a WoT-switch again to cut power 
  > so
  > it switches back to WoT operation?!
  > Are you 100% sure it's not the other way round?
  >
  > If the valve defaults to B+C (WoT) with no power and switches to A+B
  > (normal) when 12V is applied, this means my valve is not sticking but 
  > fails
  > to operate. Could I accidentally swapped the terminal connectors at the 
  > WoT
  > switch and this has reversed the switch operation?
  >
  > And no, I can not operate the valve with an external power source.
  >
  > Thanks again
  >
  > Regards,
  > Maurits
  >
  >
  >
  >
  >
  > ----- Original Message ----- 
  > From: "James Howard" <spam.me1 at ntlworld.com>
  > To: "Maurits Jonkergouw" <urq at moregraphics.nl>; "Audifans"
  > <urq at audifans.com>
  > Sent: Monday, June 20, 2005 10:16 AM
  > Subject: Re: [urq] WoT 2-Way Valve sticking
  >
  >
  > B+C is the WOT position.
  > With the ignition off - the valve is normally in this position. When you
  > switch on the ignition, power is applied to the valve and it switches to
  > A+B. When the WOT switch is activated, the valve should switch to B+C.
  >
  > You either have no power going to the valve with ignition on, or the valve
  > has failed.
  > The power to the valve goes through the WOT switch which is a normally
  > closed switch.
  > A valve stuck in B+C is normal failure mode for the WOT switch, valve,
  > wiring loom or power supply.
  >
  > Can you measure 12V at the valve connector with ignition on? This should
  > fall to 0V when operating the WOT switch.
  > Can you make the valve operate with an external power source?
  >
  > Cheers,
  > Jim.
  > ----- Original Message ----- 
  > From: "Maurits Jonkergouw" <urq at moregraphics.nl>
  > To: "Audifans" <urq at audifans.com>
  > Sent: Sunday, June 19, 2005 5:47 PM
  > Subject: [urq] WoT 2-Way Valve sticking
  >
  >
  > My WoT 2-way valve on the firwall is sticking but do not know in what
  > position: WoT or normal.
  >
  >     A
  > B _|
  >      |
  >     C
  >
  > When the WoT switch is pressed, the valve switch opens A+C, A+B or B+C ?
  > it's now sticking at B+C.
  >
  > Thanks
  >
  > Regards,
  > Maurits
  >
  > 1986 GV (Swiss WR)
  > 1985 CGT KV
  > 1982 GL DD
  > _______________________________________________