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Oil Pressure Light and Buzzer

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Oil Pressure Light and Buzzer

Hi,

I have a standard 1.8 gti. Last week the oil pressure buzzer and warning light came on. I know there are a lot of topics on this but mine is slightly different in that it comes on at tick-over and only when the oil is warm / hot NOT over 2000 RPM. If I rev the car the buzzer stops and light goes out.

The car has fresh oil and genuine filter and I have changed BOTH pressure switches but the problem is still there. I guess the next thing to do is to actually test the oil pressure. What should the pressure be ?

The engine runs very smooth, no knocking and uses no oil. Everything seems fine apart from the light and buzzer.

Any other ideas ?

Many Thanks,

BigMoose

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Oil pressure 2.0 bar (29 ldf/in) at 2000 rpm, with oil temp at 80c/176f.
Have you got the correct grade oil ? should be SAE 15W/50 or 20W/50.

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Thanks,

Had the car for nearly 20 years   :D  and always used used Quantum Synta 10/40. I kniow something 'thicker' might help the oil pressure a little but thought 10/40 was the correct grade ?

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if its coming on at idle that points to a dash problem, it should only buzz at around 2k rpm and over. id say its a fault on the oil pressure circuit thats an L shaped circuit board clipped to the speedo, you can replace it on its own

Hello my name is John and I'm a dub addict.



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Bought an oil pressure tester off EBAY and tested today from the sender hole in the cylinder head.

Reading 6 BAR at 2000RPM from cold and 2.5BAR at 2000RPM at 80C

At tickover at 80C it drops to about 1.5 BAR

Does this all sound OK and point to an electrical problem ?

Thanks

BigMoose

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perfectly fine, issue definitly isnt oil pressure :)

Hello my name is John and I'm a dub addict.



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Thanks for the replies. I have a spare set of clocks so will try swapping the circuit board.

BigMoose

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I would say clocks :wink:

Went through all this on my 16v :roll:

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Did you resolve this issue? I think I'm having the same problem? 

Anyone got a photo of the 'L' shaped circuit you can replace? 

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Hi,

Just new here.
Found the site via google.

I think the following is the L-shaped thing: control unit for oil pressure control = parts number 321.919.064.K

But how do I take the gauge cluster apart?
This seems to be risky.

rgds
Christof

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for a mk2 but basically the same for mk1 clocks:
4130 Products - Step-By-Step

Hello my name is John and I'm a dub addict.



My wiring diagrams and other documents have moved here:

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Thanks.
Now let's check if the part is available and I don't make a mess of it ;-)

rgds
Christof

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Hi all.
I'm having the same issue.
When driving I have :-

6 bar cold at 2000 rpm
1.6 bar warm at 2000 rpm
1 bar warm on idle.

I fitted a new Smith's mechanical pressure gauge so these readings should be accurate.

While driving warm I can achieve 2 bar but at 2500 rpm.

My buzzer sounds at 2100 revs with 1.6 bar.
Is this oil pressure too low?

When the revs increase over 2300 rpm the buzzer stops.

Cheers for any advice, Mark

Mk1 golf GTI cabriolet 1.8. Helios blue. born 02/08/1990.

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yes, the minimum pressure you should see is 1.8 bar at revs, this is the threshold of the high pressure warning switch.

but where is the high pressure switch, and where are you measuring the pressure? the 1.8 bar switch shoudl be in the filter housing, and you will usually see a bit higher pressure here than you do at the head.

if the switch is in the right place then I would say you need to get the oil system looked at asap

Hello my name is John and I'm a dub addict.



My wiring diagrams and other documents have moved here:

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oilsender.jpg Just found one in a drawer yesterday, ya know owning a dub, you never know where your parts are stashed….all over the house occasionally I suppose it all depends on where I take things apart…My questions is why did they park this part in the speedo, and not the fuse panel….

I love how they call the thing a high pressure switch, denoting that you have hi pressure pressure issue when it is,  "low pressure above 2000K" in actuality…
It reminds me of the Reverse Polish Notation on older HP and TI calculators.




Last edit: by Briano1234


What do Divorces, Great Coffee, and Car Electrics all have in common?

They all start with GOOD Grounds.

Where are my DIY Links?

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I have fitted the gauge to the head. Should it go into the oil filter housing?

Cheers mark

Mk1 golf GTI cabriolet 1.8. Helios blue. born 02/08/1990.

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Is 15/50 the right oil to use as recommended in this thread?

Mk1 golf GTI cabriolet 1.8. Helios blue. born 02/08/1990.

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the 1.8 bar warnign switch needs to be in the filter housing, pressure heare is usually a bit higher than at the head so try that first :)

10w40 semi synth is all these old lumps needs in our climate, if you need special oil to solve pressure issues then your engine or oil pump is worn and needs a rebuild/replacement

Hello my name is John and I'm a dub addict.



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I will try l the gauge on the filter one then.  I have replaced the oil pump and am using quantum 10/40 oil. Cheers for the advice :)

Mk1 golf GTI cabriolet 1.8. Helios blue. born 02/08/1990.

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OK.
I swapped the mechanical gauge into the oil filter sensor hole and did the test again.
(Buzzer and light were constantly on).
Cold 6bar.
Warm 1.7-1.8 bar @ 2k revs
Warm 2 bar @ 2200 revs.

What do you think?
A little better than having the gauge in the top hole.

Cheers Mark

Mk1 golf GTI cabriolet 1.8. Helios blue. born 02/08/1990.
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