I posted this on the end of another thread but it was buried at the end and I'm getting desperate. Hopefully someone can suggest something to look at be it hardware or in the tune.
I'm having weird starting issues where it wont start or the HPFP is taking ages to build up (i can see that happening). Now if i flash back to a non flex fuel map it works perfectly - starts instantly hot or cold. But with the custom flex fuel map applied it will either take about 5 secs of cranking, gradually starting once it reaches 2500 psi or like this morning it wont start at all (fuel pressure was OK this time but would not fire). Each time it's fixed by flashing back to non flex map.
Anyway this morning the only difference was that it was a bit cooler and it would not fire up at all. Reset all the adaptions in desperation, still nothing, flashed back to non flex and started perfectly.
I get no codes when the issue is happening and is more obvious the warmer it is. After doing some tests I found, at about 140f (coolant) it starts normally again. Anything over that it progressively takes longer where at about 190f it takes the longest. If its below 70f it does not start at all or its taking so long its longer than i had pressed the button (about 10 secs).
One important thing to mention is that I'm using 0% ethanol just now (its actually a custom setup where the HFS4 meth controller is outputting to the DME). If I simulate voltage to show 100% ethanol in MHD the car starts fine.
Does anyone have any ideas?
I'm having weird starting issues where it wont start or the HPFP is taking ages to build up (i can see that happening). Now if i flash back to a non flex fuel map it works perfectly - starts instantly hot or cold. But with the custom flex fuel map applied it will either take about 5 secs of cranking, gradually starting once it reaches 2500 psi or like this morning it wont start at all (fuel pressure was OK this time but would not fire). Each time it's fixed by flashing back to non flex map.
Anyway this morning the only difference was that it was a bit cooler and it would not fire up at all. Reset all the adaptions in desperation, still nothing, flashed back to non flex and started perfectly.
I get no codes when the issue is happening and is more obvious the warmer it is. After doing some tests I found, at about 140f (coolant) it starts normally again. Anything over that it progressively takes longer where at about 190f it takes the longest. If its below 70f it does not start at all or its taking so long its longer than i had pressed the button (about 10 secs).
One important thing to mention is that I'm using 0% ethanol just now (its actually a custom setup where the HFS4 meth controller is outputting to the DME). If I simulate voltage to show 100% ethanol in MHD the car starts fine.
Does anyone have any ideas?
