[DML] Re: Lambda system
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[DML] Re: Lambda system

Bypass screw is the one closest to the air sensor plate. Lets air into
the manual idle circuit.

Other two screws are balancing screws. They allocate air from the
bypass screw between driver and passenger side of the engine.

If the bypass screw is closed, the balancing screws have no effect on
anything (assuming their O rings aren't leaking).

On F series PRV's, the balancing screws are designed to snap off (only
the heads). I think its a bad idea to do so because the manual idle
circuit is rendered inoperable thereafter (unless the snapped off
screws are drilled out & replaced).

I think it's a good idea to keep the manual idle circuit available as
an option, should its use ever be necessary or desirable. Options are

Cracking open the throttle plates has the same effect as opening the
manual idle circuit.

See now why I argue that knowledge is a good thing? DeLorean owners
need to know what's going on back there.

Bill Robertson

>--- In dmcnews@xxxxxxxxxxxxxxx, Farrar Hudkins <fhudkins@...> wrote:
> What I called "air adjustment screws" = what you called "bypass
> They're tight, but not too tight, since they're only brass and I didn't 
> want to damage anything.
> Someone had also adjusted the throttle striker screw (the one below the 
> microswitch screw) to where the throttle plates were not quite closing 
> like they should. I fixed that this morning.
> The car now idles at 950rpm. That's fine with me, since the steering 
> wheel begins to shake below that speed. And it doesn't die when I turn 
> the A/C on so I think I'm done with my adjustments. :) I will check the 
> O-rings over the holidays.
> Speaking of which: happy holidays, gang! And thanks again to all who 
> helped. :)
> Peace,
> Farrar Hudkins
> #2613

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