Polo 1.2 sport the car has been put on a diagnostic machine with no faults comming back but the car still wont start the oil pressure light comes on and bleeps three times . i have changed the oil pressure switch and checked all the obvious things like fuel, spark , compression , lamba , but still the car wont fire up !!!!!!! help
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This can be a safety feature the manufacturer has implemented in this vehicle. Make sure the oil level is full. Is the vehicle ,making any tapping noises from the top end? ( valve train noise) If oil level is ok, you may have a defective oil pressure switch causing your symptoms. If the engine is abnormaly noisey it is possible there is no oil pressure and further diagnostics will be requred
your polo seems to have a problem with the diesel pressure sensor,
I am sure when it loose it's power you see the check engine light on.
it should be connected to a diagnostic machine, you'll see that I am right.
Engine and Automatic Transmission (not applicable to manual
transmissions) in this vehicles drive train are fully
electronically controlled by a computer called the PCM and TCM (Power
Train Control Module, Transmission Control Module). When a problem
like this or other drive-ability related problems occurs the computer
stores a record of the problem (there are of course some exceptions
to this, like the fuel pump, engine coolant temperature sensor and
MAF sensor for instance) in the form of a fault code in its memory,
to read these fault codes you must have the systems memory scanned
with a special tool. Once the fault code(s) are read you then must
perform the appropriate diagnostic testing to find and resolve the
problem(s)DO NOT REPLACE ANY PARTS UNTIL A TRAINED
TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD
EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always
check fuel pressure for correct spec for your make and engine type.
First of all you need to access the Engine Control Module (ECM) using suitable diagnostic equipment (VAS, VAG-COM or similar) connected to the data link connector of the car, in order to pull out all DTC's memored. DTC = Diagnostic Trouble Code. Then you will bu full informed about the root cause of the problem, and you will be able to repair & replace bad pieces and reset the ECM.
If the car has been run our of oil or ran long with hardly any oil. this will eat the bearing off of the crankshaft, thus getting no oil pressure. When you first start a cold car the oil is thicker, when it warms up to operating temperture, the oil is much thinner. This is the difference between having oil pressure and having none. When the bearings wear out it creates a much larger gap to fill and keep pressure in. The gap gets to big and not enough oil gets to the top of the engine to supply the lifters, so they begin to tap
The oil pump is relatively easy to change with the engine in situ if it is (commonly) at fault,
Get an oil pressure gauge with a pipe and brass fitting ready on, (borrow or buy cheap from boy racer shop), unscrew the sensor (or ask the garage to for a £5) and plug it directly into the sensor hole after you've been for a run.. When warm, mine sits about 40 at motorway speeds, ten at tickover.
Had exactly the same problem, completely baffled us until we discovered that the it was the oil pressure switch. We had already replaced it with a new one and then that didnt fix it so we fitted a new oil pump, but as soon as it was revved over 3000 revs the oil light came on. It turns out that there is actually a choice of 2 oil pressure switches for this car (1999 1.4 polo) one works only low pressure (black cap) and is the wrong one, the other works on a higher racio (green cap) its the high pressure one you need. If the oil light was on at tick over or below 3000 revs then its the lower oil pressure switch needed, above 3000 its the higher one. The parts people insisted there was only one, but there is definately a choice of 2 and it fixed ours instantly. If it was an older model they actually have 2 switches on the car itself and one is a high pressure and one is a low pressure (just incase anyone needed to know)
First of all not sure what you mean by back realy!
Is there a engine check light on!
if not check there is ignitiion spark. oldschool way is to take a spark plug out and earth it while its still attached to the ht lead or coil plug and turn engine over and look for spark. No spark check coli pack resitance.and cank angle sensor. Check fuel by listening for fuel pump working when ignitiion key is turned. but better to use fuel pressure tester if avalible.smell and look at spark plugs for unburnt fuel which would indicate no spark but fuel. Put it this way as long as there is fuel,spark and a fully charged battery it should try and start. take one of these away and you got proplems