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I have a P-89DC that I've had since 1993. I don't shoot it all the time but I do shoot it periodically. I replaced the extractor a few years ago because it wasn't "extracting". Seemed to have just lost its spring tension. Ruger mailed me one and I replaced it. A couple months back it loosened up...

someone delete that last post!

Just re-read...sorry, I thought you said you already changed the filter and the noise went away, my bad. Check for coolant leaks...

I've heard that "woosh" sound before too....I changed out the waterpump about a week later, dribble port started dribbling. Seems the play in the bearing affected the sound of coolant flow through that pump. I'd thing that type noise is more related to coolant flow (low coolant as suggested...

I agree with the ADBV being the likely culprit here. I have had a pressure sender read very low pressure before, a test gauge showed it was wrong. I took it off and drained it and sqirted oil in it with a syringe and reinstalled it....pressure reading went right back up to where it should have...

Winston, If there was a bubble in the sender it would act like a bubble in a hydraulic brake or clutch line. You push on the peddle, but the bubble is compressible so the brake pad or clutch doesn't move (as much anyway). In the oil pressure sender a bubble would not activate the sensor as much...

That's interesting GMBoy, Kinda looks like you have a guilty filter huh? Make sure you get all this documented with your dealership. If that filter really was blocking flow at startup I'd have thought you'd have heard it for sure, strange things do happen I guess. If there really wasn't any...

Why don't you put that possible defective filter back on just to see if problem does in fact come back, then cut it up after that. Couldn't it have been a trapped air bubble in the sender that was released somehow when the filter was removed? The original problem statement said that pressure...