The Saab Link Forums - View Single Post - t7 motors; which piston usually burns, first?
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Old 09-19-2010, 01:44 PM   #1
g96nt
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Join Date: Sep 2004
Location: Annapolis, MD
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t7 motors; which piston usually burns, first?

So, I know in DSMs, the #3 is usually the first to go, and show signs of knock. partially because of it's placement on the fuel-rail, and partially because it's inside, and doesn't get to shed heat so quickly.

I was driving home today, and did a spirited pull in the wagon, and it started smoking. when I got it down to idle @ a stop-light, it was idling pretty rough.
when I get home, I pop the hood, and notice oil and coolant on the rear-drivers' side of the motor, which is a little odd. (I assume bad HG)

when I did a compression test, I started with 3, then 4, then 2, then 1
the numbers looked like this: 190, 190, 185, 60 psi.

Is it common that the #1 piston goes? I went to it last, thinking it was the least-likely to be melted... or, it it more likely that I REALLY blew the HG pretty bad?

FWIW, I have a td04, 3" exhaust, FMIC, CAI, and it was tuned as such.
I have recently added t5 cams, but have yet to have it tuned.
I didn't think the car would need a re-tune with just cams, but I'm thinking I will, soon.
(please don't post to tell me I need to tune it)
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Craig R.
2008 9-5 Aero-1995 900T 'vert
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