80tq: Opinions wanted

[Robert Deis]

On Wed, 5 Feb 2003 JShadzi at aol.com wrote:

> Yes, since you mention it, I believe (assume so since there is oil and
> excessive-pressure in the cooling system) I have a small headgasket leak
> that gets worse with higher boost,

That was my first thought as well, but I didn't want to say it becasue
I've not seen a "small" headgasket leak before..

> but could this cause the rpm cutout
> as described?

If the leak stays open, yes. On the power stroke excess pressure goes into
the cooling system- on the intake stroke coolant could be drawn into the
cylinder through the same leak.  That would lead to the same sort of spark
problem that you'd see if you over-did water injection, which would first
show up as a high RPM, high boost cutout.

I've seen something like this with a bad headgasket problem and warped
head- liquid coolant came out the exhaust- but if it were a "small"
headgasket problem it could look like this.

--
------------------------------------------------------------------------------
  Rob Deis                  "Let the people know beforehand what the law
  MiB3347                      is and what they are to expect."
  rdeis at io.com                              -- 18th Congress, Rec. 75