2003 Dodge Ram 1500 5.7L Oil Pressure problem
Hi all, I have a question about my truck....it is an '03 Ram 1500 4X4 Hemi with 85k....and it just recently started spazzing out while I'm driving. The "check gauges" light intermittently goes on and off, and when it does, the oil pressure gauge drops to zero. Then it goes right back up. Sometimes it lasts 10 seconds, sometimes it only drops about 1/8" and then returns. So I'm thinking this is easy- sensor, right? Well, and this is the kicker, there's a knocking sound coming from underneath my oil pan now. Again, intermittently. It seems to always knock around the 800-1900 RPM range, no other times.
So autopart store dude says to replace the oil pump (after he asked me if I'd checked the oil.DUH!!!). I'm not convinced. After reading a lot of threads and posts on this site, I'm thinking it could be the fill tube, clogged screen, bearings, any number of things. My question is- how do I know what the culprit is? If it is the pump, how hard is it to replace? I'm not an "ace" under the hood, but I've pulled transmissions and replaced clutches and rear main seals, so I do consider myself capable.
Any help, ideas, suggestions, etc would be GREATLY APPRECIATTED!!!!
oh- and no, I'm not driving it 'till this is fixed. Sitting in the driveway collecting snow right now.