I have a 99 grand cher. limited. When I stop at a light or a stopsign, the oil pressure gauge drops to 0. when I step on the gas the pressure gauge goes back to normal. I checked the oil and it is at the proper level. I am concerned that I have a problem with my connecting rods inside the engine. This is not a good sign. Has anyone else experienced this problem.
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Well the warning light is supposed to come on if any of the gauges display a dangerous condition, such as no oil pressure. You may have a faulty sending unit for the gauge, or a wiring problem, or the engine may actually be loosing oil pressure when the gauge drops. You could replace the sending unit as a test, or have someone check the oil pressure with a mechanical gauge.
You'll want to remove the electrical oil pressure gauge and check the oil pressure with a manual gauge to verify low oil pressure. If the oil pressure tests good with a manual gauge, then you either have a faulty oil pressure sender, or gauge in the dash (I rarely see faulty gauges). If the pressure is still low, suspect worn crankshaft bearings. There is also a possiblity that the screen to the oil pump is clogged. This can be visually checked by removing the oil pan and cleaned.
Low oil pressure at idle can be caused by an engine with worn rod or main bearings due to (usually) high mileage . This however does not mean the engine is still not serviceable as long as the oil pressure is low only at idle. The pressure should at minimum get into the normal range at anything above idle speed.Not much oil pressure is really necessary at LOW speed. At low speed, as long as there is oil getting to the bearings, even at low pressure, you are OK. In a high mileage engine the oil pressure is often low at idle simply because the oil pump is turning slowly and cannot maintain higher pressure between the larger than normal crankshaft and bearing clearances. As speed increases the pump turns faster and supplies more oil and the pressure should go higher. Low pressure as long as it is only at idle is not a problem. However at higher speeds the pressure should be in the normal range. Such a worn engine can benefit from higher viscosity (thicker) oil such as 20W-50 in above freezing weather and 10W-40 in winter. That will increase idle pressure and the thicker oil film maintains a better film between the worn parts
Oil light should not come on unless the Level is LOW or the Oil Pressure has dropped below safe operating limits. I would do 3 things 1. Check Oil Level, if low, fill to the correct level and then restart. a. if the light does not go out.... 2. Pull the Oil Pressure Sending unit out and install a pressure gauge a. if the pressure is in normal operating limits, chances are the Oil Pressure sending unit is bad b. If the pressure is low, the issue is 1. Oil Pump 2. Engine Main or Rod bearings are bad and a engine rebuild is on its way
This could be a faulty oil pump. or more commonly a bad oil pressure sensor you can call. If its the pump i recomend you have it fixed as soon as possible. The check gauges lights up because the oil pressure isnt as much as required. But common problem is the sensor replace the sensor and the engine oil along with a filter hope this solves your problem.
Install an external mechanical (yours is electro-mechanical) oil pressure gauge on the engine and read actual oil pressure. If it is below 15psi at normal idle warm, (I like a reading of 30 or above on jeeps) then you will need to determine the reason. Causes can range from worn bearings to obstructed oil pump pickup screen. Any knocking inside the engine tells you there is a bearing problem...really doesn't matter which bearing it is, likely all are worn and will need replacement, or engine needs rebuild or replacement. I've been doing this a long time and have found that in-car bearing replacement, unless done very early on and "matching" bearings to existing clearances, will most times relieve the problem for a few days or weeks and therefore is pretty much a waste of time and $. If mechanical gauge reads normally, likely the sending unit or the passage going to it is plugged or the unit itself is going bad.
This might be a result of an oxygen sensor. If you take the vehicle to a store like autozone, they will attach a diagnostic sensor to your vehicle at no charge, and then reset the unit, and be able to tell you what is going on. This is at no charge, so there is nothing to lose. I hope this helps.
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
I had the same problem with My jeep, when i took it in to a shop, they couldn't find any problems, , after about 5 shops and a ton of headaches from the low oil pressure warning, they found out that the gauge had gone bad, you may want to look into it as well.
try replacing the oil filter and oil make sure u use the right grade oil for it if it still does it u need yo go to mechanic or if u have one connect a external oil pressure gauge to the engine to check if the car gauge is reading correctly if it is reading right then the oil pressure releif vale is stikking
if the car gauge is reading wrong change oil pressure sender