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The original engine had major over heating and low oil pressure problems. I had my mechanic install another engine in my car (used engine w/64K miles), after a few weeks it took to complete the entire installation I got my car back to test for a day or so. I find that the oil pressure once the car is warmed up will not go past 2-4 pounds (Its in the red zone). The check engine and gage lights are on. I told the mechanic to put in a new oil pump. Now he said he believes that may solve the problem. Please help, I do not know what to do at this point after spending a few thousand, its an endless money pit.

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First of all dont take it back to this mechanic,an oil pump is not what gives you oil pressure and he should know that,what gives you oil pressure is the clearance between the bearings and the crankshaft. having said that,what specific vehicle is this we are talkin about? and what year and engine?

Posted on Oct 13, 2010

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I have an 2005 FORD Focus Zetec. After a long run 30 miles the oil light will come on when the engine is idling at about 1,000 revs. It doesnt do this on shorter local trips.


have a oil pressure test done using a mechanical gauge
that will determine if oil pressure sender unit is operational or not
that will then decide if the oil pump is failing
if the engine is original then it may be worn at points that is allowing excessive passing of oil ( hydraulic belt/chain tensioner) rocker arm bushes, big ends , mains, valve for the camshaft position control
The oil you should be using would be a 30w50 viscosity

Jun 04, 2016 | 2005 Ford Focus

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Recently replaced intake gaskets, engine has 332000 miles on it. Before this problem I had very low oil pressure. Now when oil heats up oil pressure goes to zero. Check gages light comes on.


Hello Marty, I suggest you install an auxiliary mechanical oil pressure gauge to see what the true oil pressure really is and go from there.

Nov 02, 2015 | Cars & Trucks

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this means a mechanical gauge test is required to check actual pressure warm idling if low below 20 psi then the oil pressure pump relief is stuck open or engine bearing are worn

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1 Answer

Engine started knocking on a honda cr-v 2.0 vtec


check your oil level, color, and smell. My guess is that the low oil pressure light is on because of literal lack of oil to pressurize. Generally when you get that light and a knock it points to major engine repair or replacing the engine. Knocks due to oil pressure can indicate many things from a bad head gasket to a stretched rod or blown piston rings. Check your coolant reservoir for signs of oil entering the cooling system as it will float on top of the coolant. By the sound of it it needs major mechanical repairs

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1 Answer

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You should check the oil pressure with a mechanical gauge. If that gauge also reads low you probably have a major engine problem. If the pressure is normal on the mechanical gauge you have a problem with the electric gauge. Probably the sender, dash unit or wiring.

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If the engine is not making any noise.It is probably the oil sending unit that is defective.If you want to be sure you will have to install a pressure gauge and check the pressure when the vehicle is at normal operating temperature.If it is above 10 psi then replace the sending unit.It is located on the back of the motor on the block by the left cylinder head.You might need a special socket for it.Hope this helps.Good luck.

Jan 12, 2010 | 2004 GMC Yukon

1 Answer

1995 jetta oil light buzzer problem


You need to install an oil pressure gage. If the pressure is good then check the wiring to the sending unit. It could be a bad sending unit but don't replace it until you test the oil pressure. If you don't want to add the gage inside the car you could install it under the hood or use a manifold gage, it's mechanical so oil flows right to the gage instead of a sending unit, you don't leave it on the engine. Mechanics use them to test engines and transmissions. You can buy either at a auto parts store. If you have low oil pressure then either the pump is bad, the oil pump pick up screen is clogged, or the engine is worn out (bearings, valve guides, piston rings).

Feb 05, 2009 | 1984 Volkswagen Jetta

1 Answer

OIL LIGHT WONT STAY OFF; FLUCTUATING OIL PRESSURE


well take it back to you're mechanic and have him in stall a master oil pressure gauge and check teh oil pressure this will tell you if the engine indeed has low oil pressure or if the oild pressure sender is bad. also if it is rattling or knocking SHUT IT OFF you dont wana spend the 4-5 thousand to fix it im sure

Jan 11, 2009 | 2002 Toyota Highlander

4 Answers

Oil pressure light at low RPM


Before you have major repair done on your car because of the "oil pressure light", review the list and see if any of these might be the source.  Some of the things on this list are things you can do yourself, some only done by a mechanic (inexpensively), and others require the aid of a mechanic.
1.  Check to see if you have a leak.  Low oil levels can make the oil sensor light come one.  Check your oil level following the manufacturers recommended procedure or use the information listed here http://autorepair.about.com/od/regularmaintenance/a/checkoil.htm.  If you do not have a low oil level, but still suspect a leak, place a drip pan under the oil plug overnight.  If you have a leak, you'll see signs of it there.  Then take the vehicle to a trustworthy mechanic and let them trace the leak.  It is possible for your engine to only leak when it is hot, so make sure you get the engine nice and warm before you put the car away for the evening and place the drip pan under your vehicle.  Other signs of an oil leak are listed below as well as an "oily" exhaust that leaves it mark on your bumper or "blue smoke" as you drive/idle.
2.  Check the coolant levels. If the coolant is low, the oil will heat up faster and cause a viscosity breakdown.  When the oil viscosity is low (= thin oil), the oil sensor light can come on.  If the coolant is low, add more.  Keep in mind that an engine running hot will heat the engine oil to the point that it thins out and burns off in the cylinders.  If the coolant level is fine, have the coolant (water) pump checked.  If the coolant is not circulating well through the engine, you'll probably have coolant boiling over, too.
3.  If you can afford to do it, change your oil to a higher or lower viscosity.  Refer to your maintenance manual and your trusted mechanic. I say this because, if your oil is thinning out too much because the viscosity is too low, your "check oil" light will come on.  If your engine oil is too thick, you engine will need added internal pressure to get it to circulate.  At lower RPM (just like thin oil), your engine oil light will come one.
4.  Have the oil pressure checked by other than an electronic means.  Your trusted mechanic can place an oil gage between your oil filter and the rest of the engine or on the oil fill cap of the engine.  If you are having an oil pressure problem that is seal-related, that should narrow it down.  If you can't afford to do that, when you get your next oil change, replace: the oil fill cap, PCV valve, and air filter.  All these contribute to the measurement of engine oil pressure by that picky little oil pressure sensor.
5.  Have the oil pressure sensor checked.  You may need some weird add-on to make it behave.  Do a search for the following part and read and you should have a better understanding: "part # 05017800AA a terminal/wire/vent to the oil pressure switch connector".  Never forget that sensor are usually engineered to report a problem well before a catastrophic failure can occur.
6.  If you're driving a high-milege car, make sure you are up to date on all of the engine-specific services.  For some vehicles, it is recommended that the head gaskets are replaced.  If you have internal engine leaks because of it, this will solve most of those issues.  Signs of this include: coolant visible in the crankshaft area (you can see this with the oil cap off), oil fouling your coolant (you can see this in the coolant reservoir), or smokey exhaust.  Expect your trusted mechanic to recommend that you change your spark plugs, timing belt, and cam shaft gasket at the same time.
7.  See if the oil pump needs to be replaced.  A faulty oil pump can contribute to low oil pressure as it fails (but hasn't failed, yet).  
8.  Do all of the above BEFORE you take to recommendation to have your engine replaced.
I have a 1998 Chrysler Cirrus (I know it's not a minivan, but hear me out).  I've been the single owner and have learned more about how engineering oversights or over-cautiousness can send you to the mechanic for just about everything.
Hope this helps!

Jan 10, 2009 | 1999 Dodge Caravan

1 Answer

Oil Light stays on.


it sounds like a faulty sending unit the only way to know for sure is to install a mechanical gauge and measure pressure. or just replace the sender. it is not wise to drive it and just assume it is nothing major. if it is a mechanical problem will cost a lot more if you lock the engine up

Nov 14, 2008 | 2007 Chevrolet Aveo Sedan

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