Hi Jim,
Thanks for the compliments!
A couple comments:
1) I still have one of those mid-80 Fords (to be donated to a
not-so-well-off friend, as soon as I can replace the worn control arm
bu****ngs). The EGR is not a negative feedback type, but uses a position
sensor - a potentiometer mounted on the top.
2) In my humble experience of repairing my own vehicles for the last 30+
years, I have never seen a ground electrode that's totally burned - not
even
close. So what else would cause such thing?
=============================================================================================
"Jim Warman" <mechanic@[EMAIL PROTECTED]
> wrote in message
news:mb9Tj.251$Yp.126@[EMAIL PROTECTED]
> HT, you have a very good grasp on the subject of pre-ignition... A gold
> star for you 8^)
>
>
> For the OP.... it is normal for spark plug electrodes to suffer from
> erosion... Pre-ignition will tend to leave deposits on the ground
> electrode if it is severe or has been left unattended for any length of
> time...
> If this vehicle is, indeed, a 1986.... IIRC, Ford used a "negative
> feedback" type EGR valve... There is a small ****t inside the valve that
> can carbon over and this would have the effect of having the car "nose
> over" on light acceleration...>
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