Another Casualty

[Bruce]

Yaaa, nothing like 175+dF air blowing over a ecm.
Some of the under hood temps (especially in Mopars) are insane.  Consider
they had thermal blankets to keep the acid from boiling out of some of the
battery installations.
Yep, Mopar about packed up and left town after they shut down making hemis,
IMO.

Some of the GM stuff ain't much better.
When you consider where the low airflow regions are.   Another good use for
IAT / MAT sensors are for thermal mapping of the engine compartment (short
term).   At least for comparison, since some of the areas have such min air
flow, the sensor will read some radiant heat, but again if your talking
locations for compnents, that is the temps they will be seeing.
Bruce

From: "Programmer" <nwester at eidnet.org>
Subject: Re: Another Casualty
> Probably why the mopar sbec/smec  is in the inlet stream ? Arghhh...
> so my under hood 16168625 is gonna die ??
> Lyndon.

> From: Len Sabatine sabatine at epix.net
> Subject: Re: Another Casualty
> >     I'd like to add to Bruces comment about under hood mounting of plain
> >     Aluminum cased Ecm's. Better off NOT doing that gig. Starting with
the
> >     7727's , They were environmental hardened and sealed to withstand
> >     the much harsher under hood noise and temp life. 7730's and the like
> >     enjoy happier lives in the passenger compartment.  Hee he , direct
> >    an AC duct hose at the Ecm , might keep it alive longer. [pun
> intended.]
> >    Len

> > >yes, they can go in an instant.
> > >You can overheat say a driver, say in WOT.  Then the next time you get
> the
> > >ecm that warm again it fails fully.  In playing with P+Hs in a
saturated
> > >driver ecm, I did ruin several in different ways.  *Sometimes*, they
(the
> > >injector drivers) can fail at higher rpm, after overheating them.
> > >Sometimes, instantly they go, go open.   A driven solenoid, can short,
> and
> > >then become heat sensitive, and in that way wipe out part of the ecm.
> > >
> > >Instead of reinstalling them, it's better to leave them just laying on
> the
> > >floor board so there is more airflow over them, and changing chips is
> just
> > >so much easier.   Mounting one under hood is just asking for trouble in
> my
> > >book (free advise)
> > >Bruce
> > >Subject: Re: Another Casualty
> > > > Really hot day there ?? This may sound funny--but pull your ECM and
> stick it in the fridge for an hour...and re-install it. If it fires up
> > >fine...butter it, it's toast. Did you sandwich cost $7.30 ??
> > > > Lyndon.

> > > > From: Gonyou, Jeremy (.) jgonyou at ford.com
> > > > Subject: Another Casualty
> > > > > So I go out to Wendy's to get a sandwich and when I get back my
> Sunbird has a high idle, constant SES, and no ALDL comms.  I replaced my
> hacked up memcal with a bone-stock unit, but the same stuff...limp home.
> > > > > Is it just me...or did my ECM go out to lunch the exact same time
> that I did?  Is this how the '7730s go, just all the sudden?
> > > > > Jeremy (limping home)


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