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Have replaced oil sending unit, oil pump, and cleaned engine with new oil, gauge goes down and engine starts knocking whats wrong u can turn it off and restart it oil pressure goes up

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Unusual for the oil pressure to come back up, perhaps the oil pump drive is loose

Posted on Apr 03, 2011

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My 2002 Envoy started knocking on the way home and the oil pressure dropped om the gauge.


I wouldn't drive the vehicle till you find out what is wrong. Have you ever changed the oil and filter, plus, overall tune-up?
Is this high-mileage engine? You could use an analog gage in place of the oil pressure sending unit, just to double check the gage. If no oil pressure, could be the oil pump? If this is a high-mileage engine replacing the oil pump may not help. You may need an engine overhaul. Do you have any cylinder compression?
Because that knocking, hope you don't have internal engine damage?

Mar 12, 2016 | 2002 GMC Envoy

1 Answer

Having oil pressure problems


The sending unit is a variable resistor. When the oil pressure is normal only a small amount of voltage goes to ground through the sending unit. As the oil pressure goes down, more voltage is shunted to ground reducing the sending unit voltage and causing the gauge to indicate a lower pressure. If the oil pressure falls very low or disappears the sending unit shunts all the voltage to ground which causes the dash indicator to show no oil pressure.
Now if the wire to the sending unit gets nicked, melted or cut and finds a short circuit to ground, or gets disconnected in a junction point between the gauge and the sending unit, you will get the same no oil pressure indication from the gauge.
Check you wiring for a short to ground or an open connection.
The same

Aug 25, 2012 | 2004 Chevrolet TrailBlazer

2 Answers

93 Jeep Cherokee that sounds like I have a lifter knocking and started about 1 week ago. 4 days ago I observed my oil pressure gauge floating up and down and never really staying put at one certain point....


the lifter sounds like it is either worn, or starving for oil, i would 1st check the amount of oil on the dipstick, to make sure it is in the safe area, if ok, i would check the oil sending unit, on different jeep engines , the unit is located in different areas, you will have to see what size engine that you have, so you can locate the sending unit, , and if leaking or bad, [replace it, ] " if the unit is ok, i would have someone to give your engine a oil pressue test to see if it is getting the right amount of oil pressure, if it is not, it very possibly it could be your oil pump, hope this information was helpful.

Feb 12, 2011 | 1993 Jeep Grand Cherokee

3 Answers

Oil pressure at zero


its possible that the oil gauge go to bad, the oil pressure sending unit may have gone bad, the oil pump may have quit. I suggest you find the oil pressure line coming off engine, put another oil pressure gauge on it and then just crank the engien to see if you get any oil pressure whatsoever.


If you don't, then I would check the oil pressure sending unit next before I tore the oil pan off to examine the oil pump itself. Whatever you do, do not run the engine with zero oil pressure otherwise you will seize up the engine and that will cost big bucks to repair.

Hope this heslp (remember to rate this answer)

Jan 13, 2011 | 2003 GMC Sierra

2 Answers

I;ve lost oil pressure the needle stay's down while driving, is the oil pump bad or going bad? is it located in the oil pan or the front of the 4.6L MOTOR?


If the needle is staying down and the motor is not knocking then the gauge is probably bad. If you run the engine with no oil pressure, then it will not last long. It will start knocking and ruin the engine. But yes the oil pump in in the oil pan. There is also a oil pressure sending unit that could be bad. It is located on the back of the engine.

Jan 03, 2011 | 2000 Ford Expedition

1 Answer

2008 1500 suburban, pickedcar up after getting tires replaced, on way home oil pressure dropped and low oil pressure warning came on. Stopped checked oil level it was ok. started car was back at 35 to 40...


If your sending unit is one wire, unhook it from the sender and place a jumper wire from wire to ground. Turn ign on, gauge should pep high PSI. Two wire plug, place jumper between contacts of wires (unplugged). Same thing. What this does is isolate the gauge. If gauge pegs on test, replace sender. If it does it again with new sender, it's the pump. But it's probably the sender.

Nov 01, 2010 | 2008 Chevrolet Suburban

1 Answer

I have an 02 wrangler and the oil preasure goes down when Idling is that an oil pump going bad?


First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

Oct 16, 2010 | 2002 Jeep Wrangler

3 Answers

OIL GAUGE GOES DOWN AT STOPS


I had the same problem with my 97 Wrangler 4.0..Change your antifreeze, replace with some new 50/50 mix...Also chanke your oil, replace the filter with a mopar filter and use stratght 30 weight motor oil...Solved my problem

Jun 24, 2009 | 1997 Jeep Wrangler

2 Answers

Oil pressure gauge goes to 0 and car has a slight knock


What Make Model and Engine. I'm sure you have tried and oil change. Try hooking up a mechanical gauge to check the pressure.

Feb 27, 2009 | 1991 Jeep Cherokee Limited

3 Answers

Mitsubishi 3000GT oil pressure


I had this problem on my gto i turned out it was the wire from the oil pressure sender unit , it was all corroded with oil and ready to snap off , try the wiring first and if its not that then the oil pump is on its way out.


john

Oct 07, 2008 | 1991 Mitsubishi 3000GT

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