My 91 9kt making sewing machine noises. - Saab 9000 Bulletin Board - Saabnet.com
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My 91 9kt making sewing machine noises.
Posted by Ben Millard [Email] (more from Ben Millard) on Fri, 23 Feb 2001 10:40:05
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I'm scouring this site for ides, this one's got me puzzled:
My 91 9kt is making a faint "sewing machine" sound, as if one cylinder's exhaust gasket was leaking ever sooooo slightly. (Happened to me on a 69 Sonett)
It is obviously more noticeable under load, esp in mid-range/max accel. (Say 2.5k to 4k, 3/4 throttle and up.) It does not seem to be there under deceleration. It is most certain to be one cylinder, because the frequency is low enought that this "ticka ticka"* noise is distinct and you can clearly hear the separation between sounds.
I'm kinda worried about my DI anyway (127k) so this weekend I thought I'd pull it off and clean/inspect. (TLC scares the entropy goblins, I hope.) I will check/replace the plugs then anyway, in case one is leaking.
I appreciate any ideas, no matter how farfetched.
Ben
*not to go too nuts with the onomotopaeia, but the sound could also be thought of as a "pffft" of extremely short duration, hence my wondering about leaks in exhaust or--yeow <kaboom>--intake.
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