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My 96 gmc sierra 4.3 oil pressure dropped to 0 while driving it,after changing oil pump,oil and filter.she got sluggish but never shut down,I can still start,but values are tapping now and she get hot

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Bad news
cam shaft bearing and mains and big end bearings are all shot
possible crank journal damage
time to consider a replacement motor

Posted on Apr 23, 2017

  • Juan Jules
    Juan Jules Apr 23, 2017

    I changed those out 4 months ago, and only drove the truck 2 months

  • Bill Boyd Apr 23, 2017

    unfortunately when an engine is run with out oil it doesn't matter when it Was done ,significant damage can be done in minutes



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How to replace an oil pump on a 2005 Gmc Envoy XUV 4-wheel drive

Are you wanting to change the oil pump because the oil pressure flickers while idling after the engine has warmed up? If so change your oil pressure switch (located next to oil filter) first, to see if that fixes your problem. Sometimes dirty oil gets trapped in the switch and breaks down when the engine is warm. Replacing the oil pump is a major project requiring dropping the oil pan. Check U-Tube or a Haynes Repair Manual.

Sep 26, 2017 | GMC Cars & Trucks

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surely it is a problem and major one. DO NOT run the engine at all. You have to carry some checks to confirm whether your gauge is not lying. Check whether you have the correct oil level fist. Check whether your oil filter is a good and non burst . Check by means of oil pressure tester the pressure of your oil, Check whether the oil switch is accurate or is not working. Check the wiring on the oil switch, finally if neither of the above have problem,check the oil pressure pump in the engine is not the culprit. Good luck.

Aug 17, 2012 | GMC Cars & Trucks

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1993 gmc sierra k1500 5.7 V8, fuel system shuts down while driving. Have replaced fuel pump, fuel filter and fuel relay.

Check to make sure oil pressure switch is not sticking or gummed up and connections are tight. Your oil pressure switch is also a safety feature that will shut down fuel pump in case you're in an accident and/or rollover.

Mar 04, 2011 | 1993 GMC Sierra K1500

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What will cause a truck to lose all oil pressure and the engine to shut off while driving down the road?

If wires came off oil pressure switch or if switch went bad, it would shut down truck immediately. Your oil pressure switch performs 2 functions; oil pressure to gauge.light and it's also a safety feature that if you're in an accident or rollover, when oil pressure drops it shuts off power to fuel pump. I'd start there. The reverse is also a possibility, if fuel pump fails, truck shuts down = no oil pressure.

Feb 28, 2011 | 1990 GMC Sierra

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Oil pressure guage stays at 40 psi on ign/engine shut down, but drops to 0 psi when ign is turned back on, and then on starting of engine operates normally... What's up ???

the oil pressure gauge only gets a reading when the engine is runningas the oil is being curculated. when you shut the vehicle off it should go back to zero and be there until the vehicle cranks back up. i hope this helps

Feb 05, 2011 | 2002 GMC Sierra 1500

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have it tested using a manual gage if still low then main baring ore most likely bad that would mean a over hall if is really low and bearings bad should be making rattle noise when started up first few seconds

Mar 11, 2010 | GMC Sierra 1500 Cars & Trucks

1 Answer

I own a 2002 GMC Sierra 3/4 ton. I have cleaned the injectors, changed fuel filter, changed oil and filter, replaced tires, but she is still fluttering and then dyeing. The RPM's drop and it feels like I...

You have a bad oil pressure switch. I know that sounds strange but It feeds the fuel pump. Some times randomly the PCM does a self check and shuts off the fuel pump relay when it does this it runs off power from the oil pressure switch. The easiest way to confirm this as a diagnosis is to unplug the fuel pump relay when the engine is running. If it dies when you unplug it thats it. if not you will probably need a fuel pump or possibly just a cap and rotor (tune) but I belive it is the oil pressure switch.


Nov 13, 2009 | 2002 GMC Sierra

1 Answer

After about 2 hrs of driving my oil guage on my 2003 sierra goes down to almost 0. I stop and shut the truck off for about 5 min. and the guaga goes back to normal for about 1 hour then the same problem...

A failing oil pressure sensor may be to blame, need to verify the pressure is actually falling to zero with a mechanical gauge. If the pressure on the mechanical gauge does not drop to zero under the same conditions then suspect the pressure sensor. If it is then
I would suspect the oil pump pick up screen is becoming clogged with debris. As mileage accumulates sludge can accumulate in the engine, as bits of it come loose they settle in the oil pan. Extended driving allows it to collect in the pick up screen until it is restricted, upon shutting the engine down the particles drift back to the bottom of the pan. There is also a more remote possiblilty of the bypass valve in the oil pump itself being the culprit, but I think the chance is fairly remote.
Good hunting

Oct 30, 2009 | 2003 GMC Sierra

1 Answer

96 GMC pickup w 350 engine, starts hard after like 8 hours.

could be your fuel pump relay you should check to see if the pump runes for about 3 sec. when you turn the key to the on position. It should if not the oil switch is turning on the pump after you achieve pressure.
if not check the relay. also with the pressure gauge hooked up check if your pressure drops off fast after you turn off the car. if so you need ether a pressure reg or a fuel pump.
hope this helps

Jun 20, 2009 | 1996 GMC Sierra

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