Compression test of 500EFI
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What should the normal PSI on these motors be?? I checked the motors while cold and they came in at 135psi for all cylinders on the left bank. The reason i checked is because i have a whine that sounds like a gear drive in the motor. The other motor sounds good though. I think it sounds like a water pump going bad... or I am starting to lose my mind!
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Also check for vacuum leak - I think there's a hose hidden under the intake plenum that is hard to see. If it has become loose enough to leak, it is a hard one to spot.
But it WILL make a whistling noise.
But it WILL make a whistling noise.