engine knock at idle only. Kevin K. and others-HELP - Saab 900 Bulletin Board - Saabnet.com
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engine knock at idle only. Kevin K. and others-HELP
Posted by Tom T. (more from Tom T.) on Mon, 23 Oct 2000 11:21:31
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Have a 1990 base 900 with 116K miles. Switched to Mobil 1, 10 W 30 and the car runs great and the mileage improved (some of that might be from a new O/2 sensor and ECU). Now I have a mystery knock at idle but it never knocks when driving hard or easy. I suspect wear in the oil pump and thin synthetic oil that wont maintain proper idle pressure. I might need to switch to thicker oil. DOES ANYONE HAVE AN IDEA OR HAVE YOU EVER EXPERIENCED THIS?? Moving to Arizona so Im sure Ill need thicker oil but the lower altitude might help (now at 6000 feet)..
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