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How do you determine the oil pump failed on a 3.5 SE

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You need to check oil pressure. you need oil pressure gauge and you will need to remove the oil pressure sensor from the back of the engine, just above the oil drain plug. its a single wire connector. the sender is a special socket also. just heads up. remove the sensor and screw in the pressure gauge. run car and observe pressure reading. if pressure is low, then the back timing chain cover gasket is most likely blown out. have seen quite few with than gasket blown out and that will cause low oil pressure.

Posted on Jul 11, 2013


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I have a 2009 passat cba engine 2 ltr oil level rises in 3 hours fuel not a tandem vacuum pump and it runs a treat no smoke until oil level rises high starts first time every time no misfire

Do you smell gasoline in the oil? If you do the diaphragm in the engine transfer pump is leaking. You have to determine why the oil level is rising in order to find the cause.

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What's your question?oil does not reach the cylinder head hence leading to lots of noise in the cylinder head. What could it be?

Hi Naftali:
Two problems immediately possible:
1) inadequate amount of oil in engine
2) Failed oil pump.
Depending on your engine, the oil pump drive will have to be determined. EXAMPLE WOULD BE FROM THE BOTTOM OF THE DISTRIBUTOR SHAFT. It is driven from a gear off the camshaft and sometimes the gear will fail, especially the fibre ones.
Get it repaired or your engine will be ruined.

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I have read that it is uncommon for the oil pump to go out on a 99 Bonneville SE How tru is this? How can I determine that's the problem before tearing into things? Not getting oil to upper end

The only time I have replaced oil pumps was rebuilding engines, You get a new one in the kit. And when some one wanted a high pressure pump installed. Two things kill oil pressure. The crank bearings are worn out or there is a ton off sludge build up in the engine. Either way, replace the engine or rebuild. Cleaning it won't help. If you want to check for sludge, remove a valve cover. Does it knock when you start it? Bearings.

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What to do if my water is mixing with the oil

What oil is it mixing with. If it is engine oil then have a compression test done to determine head gasket/cracked head. Water ( grey/white colour oil)can also get to the sump from corrosion holes in the timing cover case behind the water pump impellor. If it is oil in the radiator and is pink ,then it will be from a failed oil cooler in the radiator for the transmission allowing transmission oil to get to the coolant.

Jul 01, 2014 | Cars & Trucks

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I have a 2003 3.7lt jeep sport with no oil pressure. what can cause this problem?

A low or no oil pressure reading verified either by your dash light or gauge, accompanied by tapping or knocking inside the engine indicates that a connecting rod, crankshaft or sometimes even a camshaft bearing has failed. If the engine has heavy internal sludge deposits, I'd also suspect a blocked oil pump pickup. Low or no reading can also be caused by a bad pressure sensor on the engine, or the wiring or the gauge may be faulty. To accurately determine exactly what the oil pressure is, it's best to install a mechanical test gauge so you get a direct reading.
Oil pumps often get blamed for pressure problems. By experience, of the hundreds I've seen, only one had actually failed. Most pumps are damaged or internally worn by debris from another failure (ie: bearings etc) Therefore replacing the pump fixes the result, not the cause and it fails again very soon.
If your engine is noisy, don't drive it. If you already have, chances are that the engine should be replaced as damage from no oil pressure is often extensive and debris migrates through and contaminates oil passages making in-car repairs less than reliable.

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I have a 1998 Dodge Caravan and the oil gauge light dings when I slow down or stop. How can I fix this?

Your oil gage is telling you your engine is showing signs of wear / aging. (Possible wear on the main bearings, connecting rod, and camshaft bearings) Your idle may now be lower than it should be. Or your oil sending unit is failing. Or... the oil pump iself is not performing as it once did. Or the Oil pump pick up tube in the oil pan is clogging up. Have you tired a direct pressure reading of the oil pressure? If the direct pressure gage indicates same as your oil light then everything listed above will have to be checked to determine exactly what it is that needs fixing.


Apr 13, 2010 | 1998 Dodge Caravan

2 Answers

Oil pressure

Hi. Your symptoms are a strong indication of major sludge build up in the block region. This type of thick build up will clog up the oil ports, thus, reducing the normal flow of lubricant throughout the engine. This will cause fluctuating oil pressure, as well. Although this issue is a common cause of your symptoms, there are others. The next cause of fluctuating oil pressure will be a failing oil pump. This device can fail mechanically(gear failure). When this occurs, the engine oil will not circulate properly, thus causing the symptoms you are experiencing.

In conclusion, This type of problem will require you to administer a manual oil pressure test. This will confirm the oil pump failure. If the pressure test reveals that, indeed, the engines pressure readings are low, the oil pump will be the culprit. I recommend to administer a engine flush, and change the oil pump and oil pump screen, as well. Now, if the manual pressure test reveals that the pressure is optimal, this will indicate that the presser switch(sending unit) is faulty.

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3 Answers

Change Oil light stays on after oil change.

Turn the key to the on position(do not start the engine) Pump the gas pedal 3 times within 5 seconds. The change oil light should start flashing. Turn the key to the off position. The next time you start the vehicle, the light should go on briefly then go out.

May 31, 2009 | 2001 Pontiac Grand Am SE

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No Oil PSI showing on gaugee But Jeep is running fine?

2004 Jeep Wrangler Problem solved (low oil pressure at idle)

These are the steps to identifying the oil pressure issue

1. Check the oil pressure guage
- this is an easy test to preform by grounding out the single wire from the oil pressure sensor and confirming the gague adjust appropriatley. (With the wire grounded out it should show no oil pressure.) Take the wire off ground should show normal pressure.
2. Change the oil pressure sending usint (15.00$) from the dealer. (cheap way to eliminate a possible sensor issue).
3. Manually hook up an oil pressure gague and check the oil pressure.
Make sure the engine is at operating temperature when checking as it can have a significant impact on the reading.
(I bought a oil pressure guage for 19.00$ online that works perfect. Comes with everything you need to check the OIL pressure at a resonable price.)

Operating pressure should be from 15psi to 60psi. During idle at normal temperature Oil Presure should not be below 15psi.

MY problem: (Oil pressure gugage was droping/ fluctuating at idle) was determined that the oil pump was bad after following the steps above (My readings where 3psi at idle at running temperature. I replaced the oil pump. (only use a Melling Oil pump do not use any other brand I am not a sales person for Melling but is prefered by me and many others that I have spoke with as a soild reliable inexpensive solution 40$-50$). After I changed the oil pump It was determined that Chrysler has installed an alluminium oil pump which had significant wear at only 98,000 miles that had caused it's poor performance. I am not a fan of allumnium oil pumps. How ever it supplied just enough pressure to keep the lifters from clapping so I got luckly and was able to catch the issue before the pump failed leading to bigger problems. After the oil pump was replaced my Oil Pressure is 18psi at idle. If you have to go this far internaly go ahead and spend the extra time to check the Main bearrings for any potential wear issues that could also cause low oil pressure. If you don't want to check all of them at least make sure you check the thrust bearing for any wear as this is a crucial area. All of this can be done by droping the oil pan. (You have to drop the skid plate, exhaust and starter.) It took me and a friend about 5 hours to do everything in the drive way.

This all based off my experience and I am no way an expert. How ever I do not take into consideration lack of maintenace and sludge build up from not properly changing the oil every 3000 to 4000 miles. If you have a sludge issues you should maybe sell or get rid of the vehicle as there could be all sorts of issues from the cam bearing to main bearings to a restricted pick up tube.

Jan 02, 2009 | 2002 Jeep Wrangler

2 Answers

Oil pump

oil pump is in the oil pan

Oct 17, 2008 | 1996 Pontiac Grand Am

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