starting question

[Mlukes]

i have a 99 24v. starts up first try every time when its cold. i let it get up to temperature drive it around and i turn it off and leave it for and hour i go back and it wont start. i go back 2 hours later and it fires up first try. :bang

any ideas?
thanks

 

[motorzane]

Is the fuel pump in the tank or on the block?

 

[Mlukes]

on the block

 

[LReiff]

What codes are in the ecm?

 

[Mlukes]

when i look it shows nothing the ecm check says nothing. i have a fuel milage tune on it. thats it.

 

[chevota84]

What's the fuel pressure when cranking?
*edit* stock lift pump? Sometimes high fuel pressure will cause a hot start condition but I doubt a stock pump would do that.

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[Mlukes]

yea stock vp44 and the fuel pressure is good. we have tried cracking valves she just wont go.