This erratic ticking sound comes and goes and usually comes on while idling in a parking lot. The ticking would last for about 2-4 minutes and might not happen again for a while (for weeks or months).
First time I noticed the ticking was over a year ago and was also heard by a Volvo technician who thinks the a lifter was sticking in the lifter bore. They added BG MOA and it seemed to have quieted the lifters at the time.
Video link: http://vimeo.com/102091706
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Brian M. - 1998 S70GLT, 1998 S70 GTA
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