UK-POLOS.NET - THE VW Polo Forum

This morning I went to start my car (2011 Polo 1.2Diesel) and it just kept turning over but took a while to start. Every time since, it’s exactly the same. Takes a good 20 seconds before starting. Yesterday it was fine ? Any ideas ???

It can be many things, if it cranks slow then weak battery, if it takes couple of tries ic can be crankshaft position sensor.
Or fuel pressure sesor, on fuel pump in back of the car ( if zou dont hear it on ignition) or a bad fuel filter. Many things

are there any warning lights?
fuel pressure?
cam signal?
spark... no wait, no spark on a diesel
air blockage?
glow plugs?
white smoke?

The battery seems fine, the engine flies over. There are no warning lights etc. I just went to it, it turned over for about 15 seconds without starting, I tried again and it started instantly. Runs lovely once it’s started.

Someone has suggested it could be the ECU relay. Does this sound logical ?

I do appreciate your assistance. Thanks.

I have taken the car into the garage for repair.

Let us know what the issue was. It might be useful for someone down the road.

The garage rang to say, the only issue they can find is a leaking injector seal. They are going to change them and see how it goes. I did notice a slight diesel smell in the car recently.

I will keep you updated.

The injector seals have been replaced but it didn’t solve the problem. The garage don’t seem to have a clue, they have had the car since Friday, I rang today and they have sent for an auto electrician. I can’t believe it, I think I will get it back home and have a go myself.

I just remembered if your fuel pump was bad it would probbably log a low fuel pressure in the rail ( dtc) .

It certainly seems like there is no diesel, the engine turns for ages and then it’s like flicking on a switch it bursts into life. Also, when the car is stationary with the engine running, there is a build up of exhaust fumes inside the car.

What about the egr? It can also make starting issues.

Well, the garage finally got to the bottom of my poor starting problem. Some idiot filled it up with petrol instead of diesel, I won’t be doing that again anytime soon. Thanks for your efforts, much appreciated.

Fingers crossed that you wont be needing new injectors and high pressure fuel pump

It had to have 1 injector and fuel pump filter.