Question about 1992 Volkswagen Golf

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Vw 1992 oil pressure drops when warmed up oil pressure switch was replaced still have same prblem light comes on at idle and goes off when engine speed is increased

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Hook up a manual oil pressure guage and take readings of the actual amount of oil pressure in the engine. It may be that the switch is bad even though it is new. It may also be that you have low enough oil pressure at idle to trip the switch. On my 2.0 liter the low oil switch turns on at 4.4 PSI at idle but when the engine is revved up it turns on below 26 PSI. You may also have 2 oil pressure switches, one for low and one for high. They would be located very close together on the oil filter housing. Make sure you replaced the right switch.
You want to get this straightened out quickly as VW engines are very unforgiving when you put off repairs. Hope this helps.

Posted on Jul 12, 2010

Testimonial: "Thank you there are two oil switches on filter housing only one was replaced"

  • Jacques Aug 13, 2013

    My vehicle out when the oil pressure picks up and then there is no compression what so ever.



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1992 honda accord ex 2.2L \r\nStarts. and run s OK till engine warms-up then it lacks power and idles rough? Service engine (yellow light) comes-on after engine gets warm! Red oil pressure light also...

Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch). Although the oil pressure is suspect, this is not your only issue here. There seems to be a abnormal compression rate, present. This is causing the rough idle, and erratic RPMs. I recommend to administer a engine block compression test, as well. This test will discover if , indeed, there are issues within the cylinder heads, and block structure, such as a worn head gasket, cylinder wall issues, and cracked block. Normally, these issue will send signs, like white, or gray smoke out the tail pipe, or discolored oil. It will, also, promote erratic RPM ratings, and a rough idle. Have the oil pressure test, and engine block compression test ran, asap.

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I have a blinking oil light and now I have a check engine light on. If I stop the car and turn the engine off the oil light goes out. Then when I get going down the Hwy again it sounds the alarm and the...

What year and model is it ?

I know this happens to many VW family engines due to low oil pressure.

When oil heats up it thins out. The 'second oil pressure switch' sees a low pressure above 2300rpm and turns on warning. ....the one on the cylinder head.

At idle, the 'first oil pressure switch' is monitored....the one on the oil filter housing.

This is called a 'Dynamic Oil Pressure Monitor System'.

If the engine is cool, the light stays out, yes ?

The oil pick up becomes partially blocked and not enough oil pressure is developed turning on the warning. Dropping the oil pan and cleaning the pick up cures this problem.

If this is not the case, then the engine is worn internally and oil pressure is being lost from the a lot of little leaks..

Other than the 1.8t engine, the pump will max' out at 120 psi cold at 3000 rpm and run 45 to 80 psi down the road warmed up = Good engine.

The 1.8t however must never see oil pressure above 90 psi or things get damaged. Valves and valve gear. Expensive..think $3500.00

It is possible the switches themselves are bad. If so, always buy from VW as the aftermarket switches stink !

The electronic monitoring system it's self seems very durable, so that would be last thing to check. It's just an electronic relay on the relay board under the dash. On the Vanagon it is under the instrument cluster head.

Now, you could try thicker oil or add a bottle of LUCAS BREAK IN OIL from the parts store. $14.00.

This will help with lubrication...something new oils lack.....( 'Google' ZDDP for info' on that problem ).....and thicken up the oil in the engine.

Only sure way to tell what problem you have is to use a 'master oil pressure gauge' screwed in to both oil filter housing and cylinder head and monitor oil pressure . Warm at idle should be 15 to 25 psi. At 2000 rpm should be above 20 psi up to 80psi.

If pressure falls to near zero at high rpm at the cylinder head when fully warmed up, this indicates internal wear. Time for another engine or rebuild.

Often just replacing the rod and main bearings will give you another 80,000 miles ...subject to what engine you have.

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If there is no engine noise associated with this ow oil press reading then replace the oil pressure sending unit on the engine, it is defective, this is common on all cars.

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!- First check the quilty of the engnie oil.
2- then replece the oil pressure switch side engine block just near oil filter if the problem still.
3- mybe engine problem if oil pum is worn out that means not enough pressure.
4-it can be also enine bearing and camshaft bushes.

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By the way, vehicle is 1992 VW Polo - not Fox (which in UK is a variant of the Polo)

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