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NG900 & OG9-3 Workshop NG900 (1994 to 1998) & OG9-3 (1999-2002) & '03 Convertible Technical Forum

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Old 1 Week Ago
marcdavid marcdavid is offline
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Default Central warning light & oil pressure warning light & POP

I have a 2001 9-3 Convertible with 190k picked up a few months ago and have been working on and driving. Great fun to drive. I initially added Lucas engine stop leak to see if it would help with some leaks and the start up exhaust smoke. Then changed oil after running Seafoam through for a day or two or easy driving. Temps have been in the upper 80's and it seems to run hot and trigger the central warning light and oil pressure warning light especially in sport mode. After this weekend I have since read about the sump issues and clearly need to drop the pan and investigate.

However, my primary issue of this post is while driving this weekend on the interstate for 5 miles in high temps and perhaps running it a bit hard we heard a pop and lost some compression. We slowed, made our exit and it died. Let it cool for a bit, restarted and made it another mile. Same thing again and made it to our destination. No fluid loss. Let it sit overnight, started fine and was able to make it home, 8 miles easy driving. The central warning light & oil pressure lights were flashing, it never died but it is making a new low sounding clicking or tapping noise. Not a lifter sound.

How can i attach a sound file for you fine folks to listen?

Thank you in advance

Last edited by marcdavid; 1 Week Ago at 03:08 PM.
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Old 1 Week Ago
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lms lms is offline
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This is just a guess, but since you were getting a low oil pressure warning, now you are getting a mini knock, then the bearing(s) might be toast.
You need more posts in order to attach files.
Lucas, seafoam have their applications, but on an old turbo saab car, what usually happens is that it makes it worse as it dislodges all the gunk/sludge.
A pop in these cars usually is a Turbo hose letting loose, or something boost/vacuum related.
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Roll it into the junkyard and buy another one, this time drop the pan (or make sure there is documentation of it having been done recently) when you buy it.
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Or find a parts car with good motor and swap it. You can also rebuild if you are ambitious. But a knock may indicate crank or rod damage which gets prohibitively costly.
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Old 5 Days Ago
marcdavid marcdavid is offline
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pulled valve cover and pan, heres pictures...
thoughts appreciated on next steps
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Looks like its sludged up. Clean the crap out of the strainer, oil pan, etc. with oven cleaner. Did you pull the chain tensioner, the chain looks slack, if not pull it and measure. Put it back together, new oil filter, run some cheap oil, get it hot, drain it, then refill and see what you come up with. People have been lucky this way. But if it knocks on the first start up with cheap oil, well...
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You'll probably want to plastigauge the bearings before putting it all back together.
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mbriet mbriet is offline
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You might want to check the harmonic balancer / crankshaft pulley just to rule this out:
forums/showthread.php?t=457369
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