not starting first try
09-24-2008, 03:30 AM
#11
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
I just got the Sniper Commando upgrade and find that there are a numer of tables and functions in the tune related to fuel enrichment for hot starting, heat soak, etc. I'm going to play with some of that once I become more familiar with the wholw thing.
09-30-2008, 03:18 PM
#12
let me know how that goes.
09-30-2008, 06:29 PM
#13
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Knowing that if I let the fuel pressure stabilise before cranking it got better, I found a function named Cranking A/F Ratio, which is ECT vs AFR. The commanded AFR at 200° ECT was 13.81, and 13.1 at 140°.
I richened it to 13.25 at 200° and it seems to be improved, it's to soon to know for sure and I am still in the habit of hesitating a bit after turning the key to ON, but we'll see...
I richened it to 13.25 at 200° and it seems to be improved, it's to soon to know for sure and I am still in the habit of hesitating a bit after turning the key to ON, but we'll see...
09-30-2008, 06:51 PM
#14
3rd Gear Member
Join Date: Feb 2008
Location: SC
Posts: 621
I think the 04 mustangs have a returnless fuel system but mine is an 03 and it has a return if it does have a return then you have to have a scan tool to check the fuel pressure. My car does that sometimes but very rarely.
09-30-2008, 07:11 PM
#15
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
All '99+ 4.6L GTs have returnless fuel systems, including your '03 (if it's a GT).
10-01-2008, 10:24 AM
#16
cliffy, do you know if your 03 is an early production or late production (04 style)? mine's a late production, thus i have a different tune, slightly different piston (i think?), revised PCV system, revised exhaust and some of the intake. the reason i ask is that my girlfriends 99 GT doesnt have this problem nor does my friends early production 03 GT so i really have to wonder if its just us late ones and maybe the 04s?...
10-01-2008, 11:00 AM
#17
5th Gear Member
Join Date: Jan 2006
Posts: 2,504
i have the hot start problem too, if i miss the start on the first try (releasing the key a bit too early) then i usually have to crank it for a while before it starts on the second try. kinda embarassing at the gas station 
10-01-2008, 11:05 AM
#18
thats exactly what we're talking about. do you know whether you have an earlier or late production 03??
10-01-2008, 01:33 PM
#19
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
cliffy, do you know if your 03 is an early production or late production (04 style)? mine's a late production, thus i have a different tune, slightly different piston (i think?), revised PCV system, revised exhaust and some of the intake. the reason i ask is that my girlfriends 99 GT doesnt have this problem nor does my friends early production 03 GT so i really have to wonder if its just us late ones and maybe the 04s?...
My brother has a '99 and his also behaves as it should...
I have almost convinced myself that enrichening the Cranking A/F Ratio at 200° ECT has corrected the problem--it is at least sufficiently better that if I have anymore issues I will add another point or two...