Hi Guys! First post so be kind..
I have a 02 Audi A4 Avant 1.9tdi (awx engine) and I'm having trouble diagnosing a starting issue I am having with the car. It has 166k miles so it’s expected kind of.
It has got progressively worse over about 6 months, used to be the odd time it would take a little longer cranking but now it’s the opposite, the very odd time it will start on the button! It’s the same if it’s warm or cold just taking a few too many turns to fire up for my liking, and otherwise it drives very well.
I have changed the starter motor and checked the glow plugs and changed 2 which were gone. I also tried some diesel additive to try clear injectors a bit. I tested battery and alternator too and all checks out ok.
I have heard of some coolant temp sensor swapping out sometimes solves it but not sure which one?? Map sensor could also be involved?
Can anyone of any knowledge of these engines point me in the right direction?