Question about Volkswagen Fox

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Polo 1.3 1.3 formel C 1986. When starting all gauges work correctly. After a few miles oil warning light flicker then comes on, but goes off after about 6 miles. Car is left for 8 hrs and on return journey all gauges work correctly. Vehicle has just been serviced. Are the 2 x pressure switches the problem area, or just a short or gremling?

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  • VW BUGGEDOUT Oct 01, 2008

    THE BRAKELIGHTS STAY ON ALL THE TIME EVEN WHEN THE CAR IS OFF AND THE KEY ISNT IN IT.

  • Musa Sarar Dec 17, 2008

    I have same promlem on my Passat 1999. I was told to Put syntatic Oil, so I did but that did not help.



    Kurt

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Unplug the sensor and drive it, if it still lights you have a short to ground in the wiring some where please rate -jeff

Posted on Sep 01, 2008

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My Polo 1.6 2002,oil light comes on when driving a couple miles.The engine is overhauled 1 yr back.Sometimes I drive for months nothing then suddenly the light go on ?Beeping & go dead ?


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2. I would not assume there is a problem with the oil pressure warning light even though there could be.
The first thing the mechanic should have done when you reported the oil pressure issue is to hook up an independent mechanical oil pressure gauge and check oil pressure when the engine is hot at different RPMs. Any oil pressure issue will usually show up at idle when the engine has been warmed up properly and the engine oil is hot (unless you have some kind of intermittent oil pressure relief valve that is sticking). Just replacing parts without actually knowing what the oil pressures are at different RPMs is being sloppy and negligent.
This is what you need to do now. Contact a business that can hook up their own pressure gauge to your engine and have them check the oil pressure readings at various RPMs when the engine is fully warm. If there is a low oil pressure issue it will show up on the oil pressure gauge. As you have a new oil pump there should be no issue now with oil volume or a sticking oil pressure relief valve which on your engine should be part of the oil pump assembly.

3. Worn engines will not be able to sustain required oil pressures. Oil pressure is not produced by the oil pump. The oil pump produces oil flow but the resistance to flow is what produces the oil pressure and that resistance is created by fine clearances between operating engine parts especially on the crankshaft and components connected to it. Once the engine wears the clearances increase and the oil flows past the parts much more easily and produces/builds much less pressure.
How well your engine with over 90000 miles has been maintained depends on how often all the owners changed the engine oil and filter , whether they kept the engine oil level up to full (most owners rarely ever check oil levels between services) and whether they always used the correct product. Manufacturer oil change intervals shown in service schedules can be 10000, 12000 miles or more which is much too infrequent for the type of use 95% of private vehicles experience which typically are on the severe to very severe use end of the spectrum. Engine oil typically needs to be changed at least at half the mileage shown in service books (at least twice as frequently) and thus at least every 5000 miles if you want your engine to last.

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There may be a misunderstanding here.
Yes the warning light comes on when the oil pressure drops below 5psi.
If the light comes on and the switch is working correctly, the oil pressure is not good. Any problem with the pump or the screen would make the pressure not good.
If the oil pressure has been checked with a mechanical gauge and it is above 20psi, the switch or the wiring could be faulty.
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Bought a very reputable diy service manual for the vehicle, and that plus a bit of thought and nous gave me the cure: no intrinsic problem other than loose relay connections. Went round with the wiring diagrams as guide checking all electrical connections in tight and relays fuses etc all good. Switched on and no problem any more.

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


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