What the hell did I blow up this time? The answer.

[Jim Green]

--- Jim Green <jeg1976 at yahoo.com> wrote:
> WOT, third gear, 17 psi, ~5000 rpms, merging like a
> mad man, POW, huge backfire, big puff of black
> smoke.
>
> The car still runs great below 10 psi, compression
> is
> 120-140 psi on all cylinders, no black or grey
> smoke,
> no abnormal blowby.  It seems to be leaning out
> above
> 10 psi.  Can a fuel pump die that suddenly?  I'll
> have
> to re-route my gauge to check for sure, but it seems
> to be working just fine.
>
> I've also verified the pressure reference line to
> both
> ECU's is good.  Also keep in mind that's the only
> critical vacuum line, everything else can leak like
> crazy and it won't matter.  Any thoughts?

I figured it out,  BAD COIL!!!!!!!  Whew, that was a
close one.  I guess the coil just decided it didn't
want to put out enough spark for 17 psi anymore, which
resulted in a TON of fuel being dumped into the turbo
hot side, then BANG!  I really am lucky my exhaust is
still on the car.  Hmm, I wonder what the inside of my
cat looks like......

I also hooked up a second 7mm Aquamist jet for the
water injection.  It seems to work great having them
both turn on at 15 psi.  No bogging so far.  Now I can
advance the timing 5 degree's beyond what is safe for
91 octane gas!  Now back to that damn header project:)

Thanks for everyones troubleshooting,

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

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