frequency valve - problem diagnosis

[Fundsalo Racing]

The FV is driven directly by the F/TCU, no relay.

Popular problems could be:

bad FV (never had one fail, so far....)
intermittent wiring between F/TCU and FV (it's an
Audi)
intermittent F/TCU FV driver circuit (known to fail,
but usually fails hard, I know how to fix this now,
BTDT)

Suggest installing % duty-cycle meter to FV input and
observe during operation. I use a combo O2/%
duty-cycle LED meter mounted via velcro to the dash,
works great! Has two rows of LEDs so both can be
monitored at the same time as they are related. I can
also switch the % duty-cycle to monitor the mixture
enrichment 6th EFI mounted between the IC and TB. Adds
enough fool for 100HP over and beyond what the stock
CIS can supply.

Cheers!

-glen

OOOO

--- Vincenzo Basile <Bleaf1 at peoplepc.com> wrote:
> This is a multi-part message in MIME format.
> --
> [ Picked text/plain from multipart/alternative ]
> hello i just changed my frequency valve on my car
> the same time i did the multifunction switch,well i
> started the car and the frequency valve started
> makeing on and off type of noise something kinda of
> like a bad relay type sound,with the car dropping
> its idle ,the car was only getting 1.3 boost, but
> now  with that changed im getting an intermitten 1.6
> boost ,when iwent for the first ride after i
> installed it the car kind of like shut down and
> bucked,i continued driving and the car pulled great
> but the pull seems intermitten,is there a relay or
> something that runs that frequency switch ?
> --
>
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=====
-glen  "If we give up our freedom as the price of security, we will no longer be the great nation that we are"

United States Supreme Court Associate Justice Ruth Bader Ginsburg as quoted by the Tucson Citizen

OOOO

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