Slow turning over

[The The]

My Octy is running great but for the last few months it really struggles to crank just for the first couple of seconds then spins fine and always starts great after that, I naturally suspected the battery which I changed for a spanking new one but it's still the same. Should I be looking at starter motor or is there a voltage regulator (type thing) I should be looking at as starter motors are not cheap and as it spins great after the first seconds it could be something different (and cheaper) thanks guys.

[cheshire_cat]

I would check as many earth points as you can find especially engine to body    you could even try a jump lead as a one off test    block to batt' earth point

[The The]

Cheers I've done a couple of searches on here and it's not uncommon with the tdi's, I have a couple of things to look at Inc the crank speed sensor and a temperature sensor.

[bigjohn]

Cheers I've done a couple of searches on here and it's not uncommon with the tdi's, I have a couple of things to look at Inc the crank speed sensor and a temperature sensor.

 

Yes, but none of those should affect crank speed?

 

Start with the earths - you could try a jump lead clamped on  battery "-" and a a good metal earthing point on the engine to see if this helps

[The The]

Thanks for the advice, it only really happens when it's hot its fine when it's cold (I should have said that in the first place) and there seems to be quite a few posts with the same problem.