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Hi Guys, I have a hard start issue on my 2004 E60 530i with M54 engine. This only happens when the car is warm and I've parked it. When I start up within 30 min of parking no problem. When the car have been sitting for between 1hour up to +- 3/4 hours I get a slight hard start almost as if it's stumbling for 2-3 seconds then all 100%. Drives perfect, shifts perfect.

During my research indicated either fuel relay, DTS (double temperature switch located on engine block near firewall) OR leaky injector.

Is there anyway to test these things on a DIY base or could possibly pin point my problem?
Anyone experienced these symptoms?

Thank you in advance!!
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