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no oil pressure in top end of motor lifters are very noisey on 2002 Saturn L100

could it be the oil pump ?

Asked by for the 2002 Saturn L100
yes have the oil pressure ck'd with a oil pressure gauge
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1 more answer
Test the engine oil pressure. It should be 50-80 PSI at 1000 RPM.

2. Check for a loose timing chain.

3. Check for a ruptured engine oil filter. The pieces can get sent through the oil passages