Difficult starting when engine is warm

But whenever I start my Z cold, it starts within half a second, fires up straight away. But after it's warmed up, it takes about 4 times as long cranking the starter motor before it fires up. Any thoughts why this would be?

 

It can be a leaky fuel damper, there was a thread a little while ago.

 

Thanks pex...

I went to edit the title after reading the guidelines after I posted this and found I couldn't. Apologies for the faux-par...

 

I have this exact same problem , except mine needs to sit for about an hour before , then I have trouble starting . Cold start is fine .

 

Hot start difficulty is almost always fuel delivery related...

 

Check the bolts on your starter motor. This was my issue. I only discovered it once the starter snapped clean off.

Don

 

Fuel delivery problems by the sound of it!

Check for leaks or as Greg suggested dodgy fuel damper or regulator,

MattB

 

Coolant Temp Sensor. Check yours. Mine was dirty, would not start when hot. Leave it to cool and presto starts first time.
Cleaned them up and never happened again.
regards

 

Also check the PRVR system.

 

Didn't serious 1 PTU's also have this issue

That is they use to overheat and cook, especially due to placement, lots of people upgraded to a serious 2 and mounted it on the front of the cam gear covers (below the throttle body drivers side)

Could be wrong but from memory that issue springs to mind\

Adrian