OK, at long last I get round to taking the engine cover off.
As we did a spark test, we noted a connector at the back came out really easy.
Hmmm...
Then we notice 3 clips are broken and silicone sealant is used to hold them together. The clip that came out really easy, the silicone was completely broken.
http://imageshack.us/f/19/aristo.jpg/
We then plugged the lose connector in and ran the car for 40mins in idle, it did not cut out (typical 10-15 mins then cut out before). So I think this is probably the cause of the problem. I need to do more testing, but it looks promising.
My guess is the clips broke during a spark plug change and my mechanic sealed them.
My questions :
- what is the part number for these clips?
- I see 3 with silicone sealant, are there any more clips than the 3?