[Shotimes] Re: 215 code persists

[James F. Ryan III]

No, no, no, no, NOT silicon dielectric.  You need a "thermal compound" like
the stuff used between your CPU and its heat sink.

The back of the DIS may feel smooth, but it's not.  The mounting boss
surface on the crossover tube may feel smooth, but it's not.  On a
microscopic level the two surfaces are full of peaks and valleys.  When the
DIS is mounted on the crossover tube you get 50% surface contact at best.
When a VERY THIN layer of thermal compound is used between the 2 surfaces
the valleys are filled and a much larger surface contact area results.
Silicon dielectric fills the valleys but does not have any thermal transfer
abilities.

You can get thermal compound at CompUSA and the like.  It costs about $1-2
for generic stuff, or a few dollars more for compounds that contain small
metal particles (Silver, or Aluminum, or Copper).
http://www.pcpartscollection.com/arsi3prsipot.html
http://www.xpcgear.com/thermalcomou.html

You can get Permatex brand silicon dielectric at AutoZone, but it's not what
you want in this application.  If you used the silicon dielectric DIS,
remove it by lightly sanding and/or electrical contact cleaner spray (or
brake cleaner should work, too).


----- Original Message ----- 
From: "fgeorge" <fgeorge@pacbell.net>
To: "Justin Schick" <jschick@aafp.org>; <shotimes@autox.team.net>;
<TechSHO@topica.com>
Sent: Thursday, May 13, 2004 8:10 PM
Subject: Re: [Shotimes] Re: 215 code persists


> Da DIS needs plenty of the "little white (di-electric) stuff" smeared on
the
> back, according to the Ford shop manuals. My DIS went bad about seven
years
> ago. I replaced it and it seems fine now.
>
> Fred
> 89 GEN 1 original owner
> 123,000 miles
> ----- Original Message -----
> From: "Justin Schick" <jschick@aafp.org>
> To: <shotimes@autox.team.net>; <TechSHO@topica.com>
> Sent: Thursday, May 13, 2004 2:33 PM
> Subject: [Shotimes] Re: 215 code persists
>
>
> > Thanks for the reply Terry.
> >
> > No, I have not tried a new DIS but you read my mind, it was next on my
> list. I noticed when I cleaned up the screws for it very little of the
white
> stuff was left on its back, and it was hard and crusty, not gelatanous.
What
> do you think?
> >
> > Justin
> >
> > >>> twr1021@yahoo.com 5/13/2004 4:27:12 PM >>>
> > Justin,
> >
> > Have you tried another DIS module?? We had a local guy here that showed
a
> coil circuit failure and it turned out to be a bad DIS.
> >
> > Terry
> >
> > Justin Schick <jschick@aafp.org> wrote:
> >
> > Greetings all,
> >
> > Even with my replacement coil in place, the 215 code still haunts me.
> > Since replacing the coil I've also checked all of the underhood grounds
> > I could find (including the screws holding the DIS and crossover tube
> > on), and the plug-in connections for the DIS and coil. Everything
> > appears hunky dory.
> >
> > The symptoms are that usually right at startup, it will run rough and
> > throw the CE light. Eventually the CE light goes out and it runs
> > perfect. Usually it takes just a few seconds for the condition to clear
> > up, othertimes many minutes. When the CE light is on the tach jumps
> > around some (I swapped the cam sensor with a spare used one, also with
> > no change).
> >
> > The KOEO test I ran over lunch today also gave me a 519 code (PSPS
> > circuit open) and 452 (insufficient input from VSS). I'm not really
> > worried about these unless, in combination with the 215, they point to
> > something else.
> >
> > Any input would be greatly appreciated!
> >
> >
> >
> >
> > Justin Schick
> > silver 92 SHO in KC MO
> > 205k and counting quickly
> >
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> >
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