[Gmecm] Adjusting 7730/$8D for larger cam

[Robby]

A lot of people are powering the heater by the fuel pump circuit, that way
your heater will only
be on when the engine is running... helps your O2 live longer

----- Original Message ----- 
From: "Jay Vessels" <jay at vessels-clan.com>
To: <gmecm at diy-efi.org>
Sent: Saturday, February 03, 2007 5:29 PM
Subject: Re: [Gmecm] Adjusting 7730/$8D for larger cam


> Hi there!
>
> A heated 3-wire sensor (i.e. AFS-74) looks to the ECM like a single-wire
> part so no worries there.  You supply switched 12V and ground for the
> heater.  The signal wire connects to the ECM just like the single-wire
> one.  The heater is always powered with the ignition key on, so there's no
> worries about having to control the heater with the ECM.  I powered mine
> from the same circuit that powers my ignition coil, for instance. The
> heater isn't polarized, so it doesn't matter which wire is power and which
> is ground.
>
> My local GM dealer had both the sensor and a pigtail harness for the
> 3-wire plug in stock, so it was a quick, easy addition.
>
> Jay Vessels
> 1982 Chevrolet S-10 Sport, 2.8V6 TBI
> 1984 Chevrolet S-10 Blazer Sport, 2.8V6 (TBI pending)