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Originally posted by masraum
4 cyl or 6? Was it the sound of something banging/clanking/thudding metal on metal, or was it more of a scrappy noise. Did you notice anything else besides the noise? Did the power or power delivery change?
Usually by the time the waterpump is scraping or banging, you've lost all of your antifreeze. Any leaking?
Pretty much any type of engine problem can happen suddenly, but it seems less likely that a crank or rod bearing would go that quickly.
Is there oil in the car? Drain the oil, is it weird, nasty, full of metal filings? Is the pulley on the front of the waterpump loose or wobbly?
Could it be an exhaust problem?
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3.1 V6.
I don't know if the power delivery changed, because once the sound started I brought the car down to about 30mph and didn't accellerate very quickly, because as the revs increase the sound gets hellishly loud (or seems louder because of the increase in revs). It is definitely coming from the engine bay (not the exhaust), and does not sound like an exhaust leak.
It doesn't sound like a metal-on-metal sound. It sounds like a loud slapping. At first I thought a belt had come loose or something, but when I checked everything was tight and secure.
There is no coolant leakage, but the GM mechanic told me that this wouldn't NECESSARILY happen (although it would be the common occurance).
Oil is at the correct amount. I might just have my GF's father (the mechanic in question) swing by and tell me what he thinks...