Question Regarding Polo 1.4 9n

[Joe90jr]

Hi there we recently bought a Polo and are having some problems with it I hope you may be able to help with. Its a 1.4 petrol MkIV 2005 9n engine type BKY. When we first got it it started to misfire. I have access to a VCDS reader cable and it duly diagnosed coil pack on no.4 which I replaced.

It now plays up - it never feels like its running right an lacks some power. It has now started to cut out and refuse to turn over at random intervals. I have changed spark plugs, air filter and coolant temp sensor.

Today I ran the engine to see how it did. I noticed that it got hotter but the fan didn't kick in, neither did the temp gauge go above halfway. Worrying about overheating I turned it off and it then beeped and showed the oil light. It then wouldn't turn over at all but beeped each time and flashed the oil light. When it had cooled down a bit it started fine. I checked the rad hoses to see if the thermostat was ok and it did the correct top hose warming before the bottom hose so that seems right too. So it might be the fan switch but why would it stop the car turning over at all ? Battery seems to have decent charge as well. It is not logging any fault codes at all.

Any ideas or pointers greatly appreciated.

Cheers
Craig

[Doctle Odd]

Temp gauge on VAG cars is supposed to only to 90 which is half way. I think you have problems with earthing points on the car

[Joe90jr]

Thanks for such a quick response. The main earth looks ok. Are there any usual suspects or is it a case of going through them all ?

[Doctle Odd]

When she doesn't turn over do the ignition lights come on? Is the wiring to the starter clean and tight. There are a few earth/ground points including the battery I forget where they all are.

[Joe90jr]

No not all the lights seem to. I'll go through them tomorrow. Still confused about the fan but I guess it might be related ?

[niall campbell]

Hmmmmm its not an oil problem and car is seizing ?

When was last time you changed the oil and oil filter ?

I woudnt be bothered about the fan if its not coming on, you may need to drive it around for it to come on; water temp looks okay ....................... unless you want to throw in a new water temp sensor t be on the safe side ............... it doesn't cost much