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A loose timing chain could create a loud rattling noise. I had a new timing chain rolled-in by a Saab Indy last Fall. Cost was just under $400.
A hole in the exhaust system, the intermediate pipe seems to be a common failure point as time & miles accumulate, will create a horrific exhaust noise at speed. A new intermediate pipe is ~$170 for parts. If you want/need to replace the catalytic converters at the same time the parts bill will be near $850. I installed a 3-inch Down Pipe by myself to replace the intermediate pipe and both cats, parts cost was under $600.
If the engine has sludged and oil pressure dropped too low, you may be hearing the banging of the rod bearings with each power stroke. This is easily a terminal condition.
posted by 24.23.71...
_______________________________________
Saabs owned:
2008 9-5 Aero Sedan, sold at 227K miles
2006 9-3SC 2.0T - Wife's daily driver
2000 Viggen Convertible - Sold May, 2022
1964 Quantum IV Formula Car - Retirement project
2000 9-5lpt Sedan, sold at 318K miles
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