1.9 TDI AJM Won't start when hot ! :(

[MagicMat]

I had my question on the back of another thread, But thought i'd stick it on here to be be clearer..plus i've since found the cure !!

And some other members may actually find it useful !

I'll start from the beginning

Im 99% sure 4 months ago the car use to start from cold a bit rough, I.e. Sometimes it needed some gas.

So i did a service and changed the glow plugs (sadly for halfords ones, should have known better). However when removing an old one, the casing of it snapped. But the glow plug did not drop into the engine.

a month ago i got my brother to take the head off. The glow plug was removed and threads checked at a machine shop.

The Head was then refitted with a new head gasket and cam belt. (crank locking tool used and a drill bit for the top cam) Car ran well for a week (however again the little bit of rough cold start up happened on the odd occasion)

But then this problem developed

once the car is warm and turned off it will not restart. It turns over for ages and doesnt start, sometimes it coughs and then starts up.

To sum up the work so far.

Symptoms earlier this year,

- A little poor on cold start up - So glow plugs changed, however the casing of one broke in the head

So in October

- Head removed, glowplug removed and threads checked at machine shop.
- New Headgasket insalled (stupidly reused the headbolts, do NOT do this as there only £4 each from the dealer !)
- New timing belt
- Service done, oil and fuel filter.

A week later the car stopped starting from hot..it only liked to start from cold or luke warm, and sometimes it isnt too happy about that.

Parts Fitted with no cure

- New Starter motor (GSF)
- New MAF (OEM) (more of a service item than a fix)
- New Temp Sensor (OEM)
- New Relay 109 (OEM)
- New Fuel Filter Tap (GSF)
- Second hand Wiring harness for injectors installed and the symptoms did not change
- Second hand injectors, Was told mileage was 50-60k however take that with a pinch of salt
- All new stretch bolts used and seals on the injectors.
- Second hand Tandum pump
- Had it on VAGCOM numerous time with no fault codes.

Finally,

A friend of mine gave me some second hand Crank and Cam semsors and this solved my problem !

Im 99% sure its the crank sensor.

So if your having poor starting problems its definatly worth a look. I think there only about £65 from the dealers and are dead easy to change.

The sensor is located to the right of the oil filter housing.

Hope that helps someone.

Cheers

Matt

Btw if you want to read through my 13 page thread to see the other ideas and suggestions we had to cure the problem see here:

https://www.vwaudiforum.co.uk/forum/s...ad.php?t=84064