Warmup/fuel pressure regulator

[Huw Powell]

DGraber460 at aol.com wrote:
> 
> Is anyone intimately familiar with these little high dollar demon possessed
> hunks of aluminum?

Someone (Steve Bucholz I think) once sent me a detailed set of
information about how to adjust the relative pressure produced by these
things but I have no idea where it is anymore...

> My attitude toward them is based on an experience from a previous auto.
> What I want to know is which direction of rotation of the setting screw in
> the bottom produces higher and lower pressures. 

As I recall it was a pin that could be pushed in (richer) or moved back
out, with the device disasembled.  But your could be a bit different.

> I have 4 of the things and would like to experiment a little to bring my
> pressures into spec.
> I currently get a reading of 13.5 psi cold, 42 after 3 min., 66 after 4 min.,
> 49.6 for the next 1.5 minutes (stumbling badly), full warm= 51. After shut
> down drops to 43, 20 min. = 36, 1 hour= 33 psi. 

I think your cold and warm numbers are right on (~1 bar/3 bar)  that
little peak might be an issue - running a bit lean for a moment?

> I would like to replace the WOT switch just to be sure. It checks out with a
> meter, but with all the fury of WOT, it might give different results. Anyone
> have such a beast, or know a good source? I hate going through the dealers,
> and the local boneyard has not been user friendly lately.

It would be nice to know the WOT is truly working properly.  A new
switch can't be that much at the dealer - I got a new WOT/idle switch
thru Atlantic Imported for about $70 when my idle switch went weird and
those cost a lot more than a WOT-only switch.  Why did I buy new instead
of clean and replace?  Because it is awkward to get to and adjust and I
didn't want to ever worry about it again...

-- 
Huw Powell

http://www.humanspeakers.com

http://www.humanthoughts.org