80tq: Opinions wanted

[Jim Green]

--- JShadzi at aol.com wrote:
> See, that's the thing, I don't believe any coolant
> is coming back in the combustion chamber, on the
> track the only thing anyone ever mentioned was that
> they'd see a puff of black smoke here and there
> (like a rich condition, which would make sense if
> the boost was being blown into the coolant in one
> comb. chamber), no one has ever illuded to any
> coolant looking smoke, all the spark plugs look
> good, nice dark crispy tint to them.  I think that
> the leak is only caused by a *certain* amount of
> pressure, and that's why its aggrivated at certain
> boost pressures and above.  Like you say, usually
> head gasket failure is more catastrophic, that's why
> I'm kinda stumped, its done this very consistently
> the last 3 track events, I'm just waiting the for
> the thing to blow once and for all.
>

Hmm, the oil in the coolant can only mean one thing!
That headgasket's getting ready to go.  By what you
describe, it seems like your lifting the head under
high boost, but that _should_ mean you blow the piss
out of the HG.  Eventhough you can't hear it, that
black smoke could still be detonation, which could be
forcing some fluid past the seals in cetain events?
I'm curiouse to see what your rings look like when you
get your motor out.  Mine were in pretty bad shape
when I took the first MC out.  Your going to use some
non-stretch bolts or studs on that new motor right?

Still can't figure out why it will not rev though.
Maybe you've found another wonderfull function of the
CIS-III?  I still would not rule out the ign coil.
Are you using an MC?  I doubt it's fueling related
since you dyno'd the car and have it well dialed in.
I'd seriously grab a Saab APC for a knock light.  Mine
saves my ass all the time, especially when I get bad
gas, and I'm not paying attention.  I'm eventually
going to hook it up to run the boost so I can tune the
Haltech assuming my water injection will always be
working, then if for some reason it fails, it will
back the boost off if it starts to ping.

Anyways, enough about me, my vote is on the ignition,
get rid of that and I bet you'll be fine:)  You know
these motors can run that kind of boost all day long!

Later,

=====
Jim Green
'89 90tq 034EFI, Haltech IG5
http://www.geocities.com/jeg1976/car_home.html

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