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My husband has a 1998 Chevy Silverado 4x4 5.7 vortec. He recently had to replace his crank shaft censor that solved his issue of not cranking. Now, and even before, his oil gauge will jump from 0 to 40 back to 0 and repeat over and over and check gauges light will come on. This mainly happens when the truck is idling and pushing the accelerator usual jumps the oil gauge back up. When we check his oil, it's fine. There is also a knock in the bottom end of his engine mainly when the clutch is pushed down or when accelerating. Once he gets out of 1st, 2nd, and 3rd gears it doesn't do it as badly. We have been told by a mechanic that the bottom end of his engine is about to go out, but the mechanic said he would be losing oil, which he's not. We just purchased this truck 2.5 weeks ago and have already paid $120 to have censor replaced. We really don't have the money for a new engine or crank kit that was recommended by mechanic. Also, the mechanic only listened to the truck running! Didn't drive it or look under the truck or hood. Anyone have any ideas?? Please help!?!? Thanks in advance :)


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Location: Oregon
the oil pressure gauge is not about your oil level. (unless the level gets too low and the pick up tube doesn't get to the oil) It measures the oil pressure that the pump is able to produce. Things that affect oil pressure are the weight of the oil used, temperature of the engine, engine rpm, clearances in the oil pump, the screen on the oil pick up, pressure relief valve, cam and crank bearing clearances.

thicker oil raises the oil pressure. higher engine rpm raises the oil pressure. tight clearances in the oil pump increases pressure. same with bearings. Just from the information you posted, it would seem your mechanic has made a logical call on replacing the engine or crank kit it.

I am sorry that I don't have any good news to give you. You could see the place where you bought the truck to see if they are willing to help you out. If it's a used car dealer, see if they would take it back on a trade. Or try to sell it and buy another vehicle.


   
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