Hi: New guy here with a 99 Safari that has an intermittent rattling sound in the engine. I am hoping somebody with more Vortec experience than I can diagnose this.
You can hear it in this video--best right at the end, that sound of marbles rattling that makes me thing rod knock. However, the sound is not always there. The first few seconds the van runs, it sounds great, then the rattle, which does not speed up as the RPMs increase. And it sometimes goes away completely. Any ideas?
You can hear it in this video--best right at the end, that sound of marbles rattling that makes me thing rod knock. However, the sound is not always there. The first few seconds the van runs, it sounds great, then the rattle, which does not speed up as the RPMs increase. And it sometimes goes away completely. Any ideas?