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  #1  
Old 03-17-2011, 01:35 AM
SINNER SINNER is offline
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Default 96' 5.9 1500 oil pressure drops when stopping

Hello, I have a 1996 1500 4x4 5.9 auto. When I start my truck it makes a loud nocking noise for about two seconds then she runs fine. Also after I drive it normaly for a few minutes and come to a stop the oil pressure goes all the way down and the oil light comes on. When I start to drive again the pressure goes back to normal but when I come to a stop the pressure goes all the way down again and the oil light comes back on. I dont know if the knocking noise and oil pressure are related. I just changed the oil, filter and air filter. There is no "check engine" that comes on. Only the oil light. And sometimes the oil light will somewhat dim off and on when the pressure goes down. any help would greatly help me. Thank you very much in advance.
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Old 03-17-2011, 08:47 AM
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The startup noise you hear is likely a lifter that's bled down. You need to check your oil pressure with a mechanical gauge and if it verifys what the electrical gauge is saying, you need to go inside the engine and find the problem.
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Old 03-17-2011, 02:51 PM
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Can I cause anymore or alot more damage if I continued to drive it like this for a month? Average 70 miles a day about 2000 miles in a month. Before I do that. I will def. check with mechanical gauge. Thank You.
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Old 03-17-2011, 11:13 PM
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Default what exactly is a mechanical oil gauge? Same as switch?

Is a mechanical oil pressure gauge the same as an oil pressure sending unit (or switch)? I just priced the sending unit(or switch) at Napa. It cost $22 is that what your talking about? It screws in by the oil filter and has a plug for a wire harness. Should I replace this? Thank You in advance.
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Old 03-17-2011, 11:45 PM
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A mechanical pressure guage is one that will go in place of the pressure switch. It has a tube that goes from the block to the guage, oil will go inside the tube. This will show you the oil pressure. This is a true reading vs an electrical signal from a switch. Most Advance, Pepboys, Autozone stores have these at a reasonable price.

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Old 03-18-2011, 12:17 PM
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Honestly, it sounds like Rod bearings are going out, the knocking could be that they are worn down and need possibly to be replaced. And your oil pressure is dropping because of the clearance issue your rod bearings have with the crank, even if its slight you'll hear a knock and a drop in pressure.
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Old 03-18-2011, 12:47 PM
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A rob bearing knock isn't going to go away after a couple of seconds and it will get worse as oil temp increases. A lifter that has bled down will pump up in a few seconds.
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Old 03-18-2011, 04:50 PM
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Default Whay should the oil PSI read at idle and throttle?

I just bought the mechanical oil pressure gauge. (Sunpro $18) Is it neccesary to put in a "T" where the existing unit is in order to keep the old unit plugged in? Or can I just leave the old unit unplugged and run the new mechanical one in its place? Also what is the PSI supposed to be at when idling and at throttle? After I check the oil pressure I will tell you what I found.
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Old 05-30-2011, 04:47 AM
kevmit123456 kevmit123456 is offline
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Default Any ideas

I have the same prob with my truck right now, my truck knocks at start up for a sec then runs normal it also makes knocking sounds from 1500rpm to 2200rpm when in park or under a light load but not when pulling my trailer. The check guage light also comes on when it's warm and I come to a stop and the oil presure guage rises then drops right away. Today when I was pulling the trailer in from the lake the truck over heated and the oil presure droped when moving. After coming to a stop I looked under the hood and their was coolant everywhere it blew out the rad cap and oil was still good. Any ideas?
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Old 06-05-2011, 08:18 AM
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I'm not at all sure about this but... you have all the classic symptoms of either a bad/failing oil pump or an oil pump pickup screen that is partially obstructed/clogged. Best case scenario...flush the engine... then find a diagram of the approximate location, and height off the bottom of the oil pump pickup screen. Then go in through the oil drain plug hole with a "homemade custom bent wire coat hanger" (you read that right a simple coat hanger) and carefully, very carefully scrap the sludge off the screen...flush again and put in new oil and filter.
I had an old Ford back in the 80's with 200K on it that had exactly the same symptoms. The old timer next door showed me this trick. It actually worked a couple of times and sure beat dropping the pan! The pickup screen is usually less than an inch off the bottom of the pan and no matter how often I changed my oil...it eventually got plugged up. Of course that was back when "Dino Oil" actually had chunks of dinosaurs in it. ☺
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