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Sorry for the cross post (from the 9-3 BB), but someone replied that folks on this BB might have some ideas:
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A couple of weeks ago I reported that my 1999 viggen up and died on me on the way into work. A local garage verified that simple things seemed to be working (spark, fuel), did a compression test and discovered good compression in only one cylinder. The car was sent to an engine shop which did a leakdown test and determined there was a problem in the head, pulled the head and found three exhaust valve seats were "off center". Based on their experience and after consulting with a saab dealer, they believe the head had overheated. I observed that the temperature guage was dead-center, as always, after the car died.
The shop rebuilt the head, did a "competition" valve job, new guides and seals. They also replaced the rings and honed the cylinders. The shop indicated no signs of detonation on the pistons (good news) and the bores were all perfect. I basically ended up with a top end rebuild. I discussed the problem alot with the engine shop dude, he was concerned that the symptoms I reported didn't match what he saw in the engine (i.e we don't understand what caused the failure). I did have a slow coolant leak which I could never find the source of, once and a while I'd get a little coolant on the garage floor. The leak never seemed to make a dent in the coolant level in the overflow tank. There was some talk about localized hot spots in the head, when the engine is running hard, there's alot of heat, especially in the exhaust valve ports.
Some background I bought the car last year, it had 40K on it. The previous owner had installed an Abbott ECU, intercooler, turbo inlet pipe exhaust and a Cone filter. I've taken the car to the track three times this year. I drive the car pretty hard, but always give it time to warm up and cool down. I run mobil 1 oil. I don't always push the car as hard as it will go at the track, I think I'm pretty conservative. Certainly track days are harder on the car than driving to work, but I figure it was well within the parameters the engineers designed the car for. I'm wondering if I need to be especially careful coming in after track session, I could be more diligent about letting the car idle a while after coming in.
Any thoughts?
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posted by 69.242.125...
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