Kurt -
Whether the EGR Valve works or not, there are two metering ports, (one for
each bank of cylinders), installed in the bottom of the manifold, under the
Support Plate, with small holes in them to admit gasses into the mix. If
these are clogged, the whole EGR concept is worthless, moreover, the passage
between the EGR Valve and these ports is usually clogged with tars,
especially on high-mileage cars, and the system won't work. Not employing
the EGR Valve is your choice, but if it has a defective or leaking vacuum
chamber, you'll have a lean mixture and then EFI will be unable to
compensate for this since it occurs after the information for the correct
Fuel-Air Mix is determined. If you remove it, then use a blank plate to
cover the opening.
The "melting" of the potting compound is usually from original equipment
modules. If it gets into the throttle plate bores, it'll disrupt the
operation. Use the same cleaner for the Throttle Plate as is used to clean
the upper dish and modules. Carb cleaner and/or a similar substance. It's
messy and takes time; must be done. Hope this helps.....Bob Harris
----- Original Message -----
From: "Kurt Piepenburg*" <trukkcp@xxxxxxxxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Monday, September 02, 2002 8:48 PM
Subject: Re: IML: 1981 Potting Material
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