Audi 80 M reg 1.6 petrol Oil pressure warning light comes on when you rev it. Changed oil filter. Thought might be blocked filter. Oil pressure is high so no mechanical problems. Does any one know were the oil pressure switch on the engine is located as my theory is that it is faulty or has any one any other idea what might be causing the light to come on Additional Details - DOME RBC If you read it properly the oil pressure is to high The engine is in good condition and has not been thrashed
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Re: Audi 80 oil pressure light
I think from memory that the oil pressure switch is at the back of the cylinder head, if its not there it will be located just above the oil filter, these switches are very cheep to buy and can be bought from any good motor factors. You are right to suspect the switch, its the first thing to eliminate before bogging your self down with more complicated and expensive problems.
I had a similar problem with my Audi 80 B4 model, previous owner spent a lot trying to get the oil light on the dash to turn off, im no mechanic by any means but i changed a fuse and it went off and has never come back, might be something worth looking at, Hope this helps
Your oil pressure switch is faulty,or the loom going to it is grounding off the engine block, The switch is beside the sump,disconnect the switch and check if the lamp has went out,if it has replace the switch,if it hasn't replace/repair the wiring.
The switch shorts and the output from switch to dash is then grounded through the bolts that holds the switch in place.
I had the same problem with my 1989 Audi 80 1.6 petrol engine. Everytime when I start the engine and press throttle, the oil pressure light comes on, but when I relese the throttle it comes off. When the engine reach the working temperature,everything is normal and the oil pressure light doesn 't twinkle anymore.. I think that is something wrong with a sensor..
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The oil pressure light coming on at idle is not a big worry, so long as it goes out as soon as revs rise.. First step is to remove the oil pressure sender unit and screw in an oil pressure gauge. a mechanic can do this for you. This will tell you if the sender is faulty (common enough) or the oil pressure is low. A rule of thumb is to have about 10 psi per 1000 RPM in the normal rev range
If it is indeed low, possible causes are
- worn big end or main bearings (the car is old enough)
-faulty or weak over-pressure relief valve in oil pump
-worn or faulty oil pump
-blocked or sludged up oil passages
-blocked or sludged up oil pickup strainer mesh in sump
Some of these can be investigated by putting the car on a hoist and removing the sump
if you have a 4jx1 3.0 engine then the engine wont run properly because engine oil pressure is what drives the direct injection system.
Check for blocked oil filters 2 pieces if not remove the oil pan and check the oil pickup tube for oil sludge blockage
First check the dipstick, make sure there's enough oil in the engine. If so, then there may be a problem with the oil filter, when was it last changed. It could be the sender, is the connection good and clean. Finally the oil pump filter may be blocked, or possibly the oil pump has failed.
Do not assume that the low oil pressure warning is a false one or that you only have a faulty oil pressure sensor. Your engine may in fact be running with low oil pressure once the oil heats up and thins out. 8-10 miles of running is enough to get the oil hot. It is significant that you only get the low oil pressure warning once the engine oil is warmed up.
If the oil pressure in the engine is low, engine lubrication will be impaired and the engine can be badly damaged so you need to run an engine oil pressure check.
1. How long has it been since you have changed the oil in the engine? If it has not been changed in the past 6 months then change it and change the oil filter at the same time. You must only use the oil specified by VW for that particular engine.
2. When new oil is heated it thins. If it is old and contaminated it will be even thinner when warm. You will get less oil pressure when the oil is thin and hot and more oil pressure when it is thick and cold. Fresh new oil is a little thicker as it has not been diluted with petrol and other contaminants. Oil pressure also varies with engine speed (RPM). At idle or low engine RPM the oil pressure is lower.
3. OIL PRESSURE CHECK After the oil is changed the car needs to be run to check if the oil pressure warning still appears. (I suspect that it probably will). If it does appear then an independent oil pressure gauge needs to be connected up to the lubrication system in the car to check the engine oil pressure. This is best done when the engine oil is hot because this is when you are getting the low pressure warning. Any competent mechanic will be able to do this. ( The useless ones will not). The oil pressure can then be properly checked on the gauge at various engine RPM. If there is a low oil pressure reading from the gauge then there could be a problem with the oil pump, the oil pick up or the oil pressure relief valve in the engine.
4. You mentioned that you see the oil pressure warning disappears once you accelerate. I suggest this is only occurring because with an increase in engine speed (higher RPM) the oil pump speed is increasing and the low oil pressure problem is being overcome temporarily. However as soon as the engine RPM drops the oil warning will appear again which means the engine is running with below minimum oil pressure at that RPM.
Even when you get no warning, the oil pressure in the engine could still be running significantly below the optimum level.
5. It is possible that the oil pressure is fine and that the problem is an electrical gremlin as these cars suffer from a variety of electrical faults. However from what you have described I think there is a problem with low oil pressure in the engine and until it is properly checked it is unwise to assume that you are just getting false oil pressure warnings.
this is just a thought , but i would first replace oil pressure switch as this is cheap start to solving your problem , i wonder if you have caused air leak when chnageing oil sensor in sump by not sealing sump correctly ,? the other thing may be you oil pump is worn causing incorrect oil pressure , which may be reason for your oil problems in the beginning , hope this helps , i know what its like when you run out of idea's good luck .
The oil pressure sender unit is located on the oil filter housing.These do tend to leak at times. The warning light for this switch is a red oil can and a buzzer. Replace the switch. If warning light still comes on, have the oil pressure checked. The oil level sender warning light is an orange oil can with oil level under it. This sender is fitted on the bottom of the oil sump and can leak past the seal. If warning light comes on, check oil level. If ok, check for damage to wiring under vehicle. Senders do some times become faulty.
The car has entered into fail safe mode. It wil not allow the engine to rev high but allows you only to get to a mechanic or to get some oil into the engine. What's the level like? Is there any trace of leakeage?